Previous Year Paper

DSSSB TGT (Natural Science) Official Paper (Held On: 07 Sept, 2025 Shift 3) (Previous Year Paper)

Held in 2025

200 questions120 minutes
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Reasoning Ability (20 questions)

Question 1

Six students are sitting around a circular table facing the centre. Eden is an immediate neighbour of both Ben and Carla. Adam is sitting second to the left of Carla. Franklin is sitting third to the left of Ben. David is an immediate neighbour of both Adam and Ben. Who is sitting between David and Eden?

  1. AOption (a)

    Adam

  2. BOption (b)

    Carla

  3. COption (c)

    Ben

  4. DOption (d)

    Franklin

View answer & explanation

Correct answer

Answer: (c)C.

Ben

Why this answer is correct

Given:  Six students are sitting around a circular table facing the centre.

  • Eden is an immediate neighbour of both Ben and Carla.
  • Adam is sitting second to the left of Carla.
  • Franklin is sitting third to the left of Ben.
  • David is an immediate neighbour of both Adam and Ben

The Final Arrangement is,

Ben is sitting between David and Eden.

Hence, the correct answer is "Option 3"

Question 2

Select the set in which the numbers are related in the same way as are the numbers of the following sets.

(Note: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g., 13 – Operations on 13 such as adding/subtracting/multiplying to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

19 - 3 -11

8 - 4 - 6

  1. AOption (a)

    12 - 8 - 10 

  2. BOption (b)

    3 - 8 - 7 

  3. COption (c)

     3 - 5 - 2 

  4. DOption (d)

    12 - 3 - 8

View answer & explanation

Correct answer

Answer: (a)A.

12 - 8 - 10 

Why this answer is correct

The logic follows here,

19 - 3 -11

  • 19 + 3 = 22
  • 22 ÷ 2 = 11

8 - 4 - 6 

  • 8 + 4 = 12
  • 12 ÷ 2 = 6

Similarly,

12 - 8 - 10 

  • 12 + 8 = 20
  • 20 ÷ 2 = 10.

Hence, the correct answer is "Option 1"

Question 3

87 people are standing in a row facing north. Mae is 16th from the left end while Fae is 36th from the right end. How many people are there between Mae and Fae?

  1. AOption (a)

    39

  2. BOption (b)

     35

  3. COption (c)

    33

  4. DOption (d)

    37

View answer & explanation

Correct answer

Answer: (b)B.

 35

Why this answer is correct

Total people = 87

 

  • Mae is 16th from the left.
  • Fae is 36th from the right.
  • First, convert Fae’s position to from the left:
  • Position of Fae from left
  • = 87 − 36 + 1
  • = 52nd from the left
  • Now find the number of people between Mae and Fae:
  • 52 − 16 − 1
  • 35

Hence, the correct answer is "Option 2"

Question 4

Below are given two sets of numbers. In each set of numbers, a certain mathematical operation on the first number results in the second number. Similarly, certain mathematical operation on the second number results in the third number and so on. Which of the given options follows the same set of operations as in the question?

(Note: A two-/three-digit number cannot be broken into individual digits for operations e.g., if 37 is followed by 10, the operation cannot be 3 + 7 as a two-digit number cannot be broken into individual digits.) 

10 - 15 - 25 - 100

42 - 47 - 57 - 228

  1. AOption (a)

    26 - 32 - 37 - 148 

  2. BOption (b)

    31 - 36 - 43 - 172

  3. COption (c)

    18 - 23 - 33 - 132

  4. DOption (d)

    23 - 27 - 34 - 170 

View answer & explanation

Correct answer

Answer: (c)C.

18 - 23 - 33 - 132

Why this answer is correct

The logic follows here, 

Similarly,

Hence, the correct answer is "Option 3"

Question 5

In a certain code language, ‘GROW’ is coded as ‘3967’ and ‘WORM’ is coded as ‘3957’. What is the code for ‘M’ in the given code language?

  1. AOption (a)

    7

  2. BOption (b)

    9

  3. COption (c)

    5

  4. DOption (d)

    3

View answer & explanation

Correct answer

Answer: (c)C.

5

Why this answer is correct

‘G R O W’ -  ‘3 9 6 7’  

‘W O R M ’ - ‘3 9 5 7 ’

Code for M is 5.

Hence, the correct answer is "Option 3"

Question 6

This question is based on the five, three-digit numbers given below.

(Left) 672 159 764 237 784 (Right)

(Example: 697 – First digit = 6, second digit = 9 and third digit = 7) (Note: All operations to be done from left to right.)

If all the numbers are arranged in ascending order, the position(s) of how many numbers will remain unchanged?

  1. AOption (a)

    Two

  2. BOption (b)

    Three

  3. COption (c)

    One

  4. DOption (d)

    Four

View answer & explanation

Correct answer

Answer: (c)C.

One

Why this answer is correct

Given:  (Left) 672 159 764 237 784 (Right)

Original positions:

672 , 159 , 764 , 237 , 784

Arrange numbers in ascending order:

159 , 237 , 672 , 764 , 784.

Only one number (784) remains in the same position.

Hence, the correct answer is "Option 3"

Question 7

Select the triad that follows the same pattern as that followed by the two triads given below. Both triads follow the same pattern.

LJ-NK-PR

OM-QN-SU

  1. AOption (a)

    QO-SP-UW 

  2. BOption (b)

    QP-SO-VX

  3. COption (c)

    QO-RP-UX

  4. DOption (d)

    QP-RO-UX

View answer & explanation

Correct answer

Answer: (a)A.

QO-SP-UW 

Why this answer is correct

The pattern followed here is:

Similarly,

Hence, the correct answer is "Option 1"

Question 8

What will come in the place of the question mark (?) in the following equation, if ‘+’ and ‘−’ are interchanged, and ‘×’ and ‘÷’ are interchanged?

9 ÷ 4 + 45 × 5 − 14 = ?

  1. AOption (a)

    40

  2. BOption (b)

    42

  3. COption (c)

    41

  4. DOption (d)

    43

View answer & explanation

Correct answer

Answer: (c)C.

41

Why this answer is correct

Given:  9 ÷ 4 + 45 × 5 − 14 = ? 

‘+’ and ‘−’ are interchanged, and ‘×’ and ‘÷’ are interchanged

⇒9 ÷ 4 + 45 × 5 − 14 

‘+’ and ‘−’ are interchanged, and ‘×’ and ‘÷’ are interchanged

⇒9 × 4 - 45 ÷ 5 + 14 

⇒9 × 4 - 9 + 14 

⇒ 36 + 14 - 9

⇒41.

Hence, the correct answer is "Option 3"

Question 9

Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements.

Statements:

No hammers are screwdrivers.

All screwdrivers are wrenches.

Some wrenches are pliers.

Conclusions:

I: Some hammers are wrenches.

II: Some screwdrivers are pliers.

  1. AOption (a)

    Only conclusion (II) follows

  2. BOption (b)

    Only conclusion (I) follows

  3. COption (c)

    Neither conclusion (I) nor (II) follows

  4. DOption (d)

    Both conclusions (I) and (II) follow

View answer & explanation

Correct answer

Answer: (c)C.

Neither conclusion (I) nor (II) follows

Why this answer is correct

The least possible Venn diagram is as follows:

Conclusions:

I: Some hammers are wrenches.- False (As there is no direct relation between hammers and wrenches, it may be possible but not definite. Hence, it is false)

II: Some screwdrivers are pliers. - False (All screwdrivers are wrenches and some wrenches are pliers. However, there is no definite relation between screwdrivers and pliers. Hence, it is false)

Neither conclusion (I) nor (II) follows

Hence, the correct answer is "Option 3"

Question 10

In a certain code language,

'A + B' means 'A is the mother of B',

'A - B' means 'A is the brother of B',

'A x B' means 'A is the wife of B',

'A% B' means 'A is the father of B', and

'A # B' means 'A is the daughter of B'.

How is L related to Q if 'L #PxG%V-N+ Q'?

  1. AOption (a)

    Mother's mother

  2. BOption (b)

    Son's daughter

  3. COption (c)

    Mother's sister

  4. DOption (d)

    Sister

View answer & explanation

Correct answer

Answer: (c)C.

Mother's sister

Why this answer is correct

Family Chart:

As per the given information,

N is mother of Q and L is sister of N.

Hence, the correct answer is "Option 3"

Question 11

What should come in place of the question mark (?) in the given series?

7 20 33 46 59 ?

  1. AOption (a)

     70 

  2. BOption (b)

    71

  3. COption (c)

    72

  4. DOption (d)

    73

View answer & explanation

Correct answer

Answer: (c)C.

72

Why this answer is correct

The logic follows here, 

Hence, the correct answer is "Option 3"

Question 12

What should come in place of the question mark (?) in the given series based on the English alphabetical order?

SWE NRZ IMU DHP ?

  1. AOption (a)

    YHV

  2. BOption (b)

    YKI

  3. COption (c)

    YCK

  4. DOption (d)

    YVG

View answer & explanation

Correct answer

Answer: (c)C.

YCK

Why this answer is correct

The pattern followed here is:

Hence, the correct answer is "Option 3"

Question 13

What should come in place of the question mark (?) in the given series based on the English alphabetical order?

KIT HFQ ECN BZK ?

  1. AOption (a)

    YWE

  2. BOption (b)

    YWH 

  3. COption (c)

    YHW

  4. DOption (d)

    YHE

View answer & explanation

Correct answer

Answer: (b)B.

YWH 

Why this answer is correct

The pattern followed here is:

Hence, the correct answer is "Option 2"

Question 14

If + means –, – means ×, × means ÷, and ÷ means +, then what will come in place of the question mark (?) in the following equation?

10 – 143 × 11 + 140 ÷ 22 = ?

  1. AOption (a)

    10

  2. BOption (b)

    13

  3. COption (c)

    12

  4. DOption (d)

    8

View answer & explanation

Correct answer

Answer: (c)C.

12

Why this answer is correct

10 – 143 × 11 + 140 ÷ 22 = ?

⇒10 – 143 × 11 + 140 ÷ 22 

  • means –, – means ×, × means ÷, and ÷ means +

⇒10 × 143 ÷ 11 –140 + 22 

⇒ 10 × 13 –140 + 22 

⇒ 130 + 22 –140 

⇒ 152 – 140 

⇒12.

Question 15

Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusion(s) logically follow(s) from the statements.

Statement:

In a recent survey on colours, 41% people preferred purple, 27% preferred yellow, 19% preferred orange, while 13% were neutral.

Conclusions:

I. The total number of people who prefer yellow and orange is more than the number of people who prefer purple.

II. Purple colour is better than yellow colour.

  1. AOption (a)

    Both conclusions I and II follow.

  2. BOption (b)

    Neither conclusion | nor II follows.

  3. COption (c)

    Only conclusion II follows.

  4. DOption (d)

    Only conclusion I follows.

View answer & explanation

Correct answer

Answer: (d)D.

Only conclusion I follows.

Why this answer is correct

Conclusion I:

The total number of people who prefer yellow and orange is more than the number of people who prefer purple.

Yellow + Orange = 27% + 19% = 46%

Purple = 41%

Since 46% > 41%, this conclusion logically follows.

Conclusion II:

Purple colour is better than yellow colour.

The statement talks only about preference percentages, not about quality or superiority of any colour.

So this conclusion does not follow.

Only conclusion I follows.

Hence, the correct answer is "Option 4"

Question 16

Each of Q, W, E, R, T, Y and U has an exam on a different day of a week, starting from Monday and ending on Sunday of the same week. No one has an exam after Q. Only three people have exams between W and U. Only one person has an exam between Q and W. R has an exam immediately before Y. T has an exam immediately before W. How many people have exams between E and R?

  1. AOption (a)

    Three

  2. BOption (b)

    Two

  3. COption (c)

    One

  4. DOption (d)

    Four

View answer & explanation

Correct answer

Answer: (a)A.

Three

Why this answer is correct

  • No one has an exam after Q
  • Only one person has an exam between Q and W
  • Only three people have exams between W and U
  • T has an exam immediately before W
  • | Mon | U | | --- | --- | | Tue | | | Wed | | | Thu | T | | Fri | W | | Sat | | | Sun | Q |

   

R has an exam immediately before Y. 

MonU
TueR
WedY
ThuT
FriW
SatE
SunQ

The Final Arrangement is,

MonU
TueR
WedY
ThuT
FriW
SatE
SunQ

3 people have exams between E and R

Hence, the correct answer is "Option 1"

Question 17

Based on the English alphabetical order, three of the following four letter-clusters are alike in a certain way and thus form a group. Which letter-cluster DOES NOT belong to that group? (Note: The odd one out is not based on the number of consonants/vowels or their position in the letter-cluster.)

  1. AOption (a)

    SYZ 

  2. BOption (b)

    KQR 

  3. COption (c)

    MST 

  4. DOption (d)

    JGO 

View answer & explanation

Correct answer

Answer: (d)D.

JGO 

Why this answer is correct

The pattern followed here is:

Hence, the correct answer is "Option 4"

Question 18

This question is based on the five, three-digit numbers given below.

(Left) 237 561 154 873 276 (Right)

(Example: 697 – First digit = 6, second digit = 9 and third digit = 7)

(Note: All operations to be done from left to right.)

What will be the resultant if the second digit of the highest number is added to the third digit of the lowest number?

  1. AOption (a)

    13

  2. BOption (b)

    14

  3. COption (c)

    11

  4. DOption (d)

    12

View answer & explanation

Correct answer

Answer: (c)C.

11

Why this answer is correct

Given:  (Left) 237 561 154 873 276 (Right)

second digit of the highest number = 8 7 3

third digit of the lowest number =  1 5 4

7 + 4 = 11 

Hence, the correct answer is "Option 3"

Question 19

Based on the English alphabetical order, three of the following four letter-clusters are alike in a certain way and thus form a group. Which is the letter-cluster that does NOT belong to that group? (Note: The odd one out is not based on the number of consonants/vowels or their positions in the letter-cluster.)

  1. AOption (a)

     SWY

  2. BOption (b)

    GKN

  3. COption (c)

    LPS

  4. DOption (d)

    QUX

View answer & explanation

Correct answer

Answer: (a)A.

 SWY

Why this answer is correct

The pattern followed here is:

Hence, the correct answer is "Option 1"

Question 20

Four branches of a school, S1, S2, S3 and S4, are located in a city. S1 is to the west of S2, and S4 is to the east of S3, which is to the south of S2. S4 is in which direction of S1?

  1. AOption (a)

    Southeast

  2. BOption (b)

    Northeast

  3. COption (c)

    Northwest

  4. DOption (d)

    Southwest

View answer & explanation

Correct answer

Answer: (a)A.

Southeast

Why this answer is correct

  • Four branches of a school, S1, S2, S3 and S4, are located in a city.
  • S1 is to the west of S2, and S4 is to the east of S3, which is to the south of S2.

The Final Diagram, 

South east .

Hence, the correct answer is "Option 1"

General Awareness (20 questions)

Question 21

Who among the following players led the 28-member Indian athletics contingent at the Paris Olympics in July-August 2024?

  1. AOption (a)

    Bajrang Punia 

  2. BOption (b)

    PV Sindhu

  3. COption (c)

    Mirabai Chanu 

  4. DOption (d)

    Neeraj Chopra 

View answer & explanation

Correct answer

Answer: (d)D.

Neeraj Chopra 

Why this answer is correct

The correct answer is Neeraj Chopra.

Key Points

  • Neeraj Chopra, an Indian javelin thrower, is the first Indian track-and-field athlete to win an Olympic gold medal. He achieved this historic feat at the Tokyo Olympics in 2021.
  • Neeraj Chopra is widely regarded as one of India's finest athletes, holding several national and international records in javelin throw.
  • He was selected to lead the Indian athletics contingent at the 2024 Paris Olympics, owing to his exceptional achievements and leadership qualities.
  • Neeraj Chopra is also the reigning World Champion in javelin throw, having won the gold medal at the World Athletics Championships 2023, further cementing his position as a global icon.
  • His leadership at the Paris Olympics aims to inspire and motivate other athletes in the Indian contingent to perform at their best on the international stage.

Additional Information

  • Bajrang Punia:
  • Bajrang Punia is an accomplished Indian wrestler specializing in freestyle wrestling.
  • He won the bronze medal in the men’s 65 kg category at the Tokyo Olympics 2021.
  • Bajrang Punia is a Padma Shri and Khel Ratna awardee, recognized for his contributions to Indian wrestling.
  • Although a celebrated athlete, he is not associated with athletics but with wrestling.
  • PV Sindhu:
  • PV Sindhu is a world-renowned badminton player from India.
  • She is the first Indian woman to win two consecutive Olympic medals in badminton (silver in 2016, bronze in 2021).
  • Her achievements have made her one of the most celebrated athletes in India.
  • While PV Sindhu is an inspiring sports personality, she is not part of the Indian athletics contingent.
  • Mirabai Chanu:
  • Mirabai Chanu is an Indian weightlifter who won a silver medal in the women’s 49 kg category at the Tokyo Olympics 2021.
  • She is a Padma Shri and Rajiv Gandhi Khel Ratna awardee.
  • Mirabai Chanu is a prominent figure in Indian sports but is associated with weightlifting, not athletics.

Question 22

Who among the following Chief Justices of India was elected as the Vice President of India in 1979? 

  1. AOption (a)

    Justice Sabyasachi Mukherjee 

  2. BOption (b)

     Justice M Hidayatullah 

  3. COption (c)

    Justice Harilal Jekisundas Kania 

  4. DOption (d)

    Justice K Subba Rao 

View answer & explanation

Correct answer

Answer: (b)B.

 Justice M Hidayatullah 

Why this answer is correct

The correct answer is Justice M Hidayatullah.

Key Points

  • Justice M Hidayatullah served as the Chief Justice of India from February 25, 1968, to December 16, 1970.
  • He became the Vice President of India in 1979, serving from August 31, 1979, to August 30, 1984.
  • Justice Hidayatullah is the first former Chief Justice of India to hold the office of the Vice President.
  • During his tenure as Vice President, he also served as the ex-officio Chairman of the Rajya Sabha.
  • Justice Hidayatullah is widely recognized for his contributions to Indian jurisprudence and his role in strengthening democratic institutions.

Additional Information

  • Justice Sabyasachi Mukherjee
  • Justice Mukherjee served as the Chief Justice of India from December 18, 1989, to September 25, 1990.
  • He played a significant role in interpreting constitutional provisions during his tenure.
  • However, he did not serve as the Vice President of India.
  • Justice Harilal Jekisundas Kania
  • Justice Kania was the first Chief Justice of India, serving from January 26, 1950, to November 6, 1951.
  • He is remembered for laying the foundation of the Indian judiciary post-independence.
  • Justice Kania did not hold any political office like the Vice Presidency.
  • Justice K Subba Rao
  • Justice Subba Rao served as the Chief Justice of India from June 30, 1966, to April 11, 1967.
  • He contested the Presidential election in 1967 but was unsuccessful.
  • Justice Subba Rao did not serve as the Vice President of India.

Question 23

As per the United Nations Children’s Fund report, Ending Child Marriage: A profile of progress in India 2023, over half of the girls and women in India, who got married in their childhood, live in five states of India. Which of the following options has two of those five states? 

  1. AOption (a)

    Bihar and Chhattisgarh

  2. BOption (b)

     Uttar Pradesh and Haryana  

  3. COption (c)

     Maharashtra and Madhya Pradesh 

  4. DOption (d)

    West Bengal and Mizoram 

View answer & explanation

Correct answer

Answer: (c)C.

 Maharashtra and Madhya Pradesh 

Why this answer is correct

The correct answer is Maharashtra and Madhya Pradesh.

Key Points

  • According to the UNICEF report Ending Child Marriage: A profile of progress in India 2023, over half of the girls and women in India who married in childhood live in five states: Uttar Pradesh, Bihar, West Bengal, Maharashtra and Madhya Pradesh.
  • Both Maharashtra and Madhya Pradesh are included in the top five states.
  • These states together account for a significant share of women married in childhood.
  • Hence, this option correctly contains two of the five states.

Additional Information

  • Key Facts About Child Marriage in India
  • Child marriage is defined as a marriage where either the girl is below the age of 18 or the boy is below the age of 21.
  • The prevalence of child marriage is closely linked to factors such as poverty, lack of education, gender inequality, and social traditions.
  • Efforts to combat child marriage in India include initiatives like Beti Bachao Beti Padhao and the Prohibition of Child Marriage Act, 2006.

Question 24

Mahatma Gandhi Antarashtriya Hindi Vishwavidalaya is located in ________________. 

  1. AOption (a)

    Hyderabad

  2. BOption (b)

    New Delhi 

  3. COption (c)

     Tirupati 

  4. DOption (d)

    Wardha 

View answer & explanation

Correct answer

Answer: (d)D.

Wardha 

Why this answer is correct

The correct answer is Wardha.

Key Points

  • Mahatma Gandhi Antarashtriya Hindi Vishwavidalaya (MGAHV) is located in Wardha, Maharashtra, India.
  • This university was established in 1997 by an act of Parliament to promote Hindi as an international language.
  • The university is named after Mahatma Gandhi, who strongly advocated the use of Hindi for national integration and development.
  • It is recognized as a central university and is funded by the Government of India.
  • The institution offers a wide range of courses in Hindi and interdisciplinary subjects to strengthen Hindi's role in global communication.

Additional Information

  • Hyderabad:
  • Hyderabad, the capital of Telangana, is known for its IT industry and historic sites such as Charminar and Golconda Fort.
  • It is home to several prestigious institutions, such as the University of Hyderabad and Osmania University.
  • However, Mahatma Gandhi Antarashtriya Hindi Vishwavidalaya is not located here.
  • New Delhi:
  • New Delhi is the capital of India and serves as the political and administrative hub of the nation.
  • It is home to several universities and institutions, including Jawaharlal Nehru University (JNU) and Delhi University (DU).
  • While New Delhi hosts many national-level institutes, Mahatma Gandhi Antarashtriya Hindi Vishwavidalaya is not situated here.
  • Tirupati:
  • Tirupati is a city in Andhra Pradesh, famous for its Sri Venkateswara Temple, one of the most visited pilgrimage sites in India.
  • It houses institutions such as Sri Venkateswara University and IIT Tirupati.
  • Mahatma Gandhi Antarashtriya Hindi Vishwavidalaya is not located in Tirupati.

Question 25

Karsandas Mulji, a social reformer in 19th century India, is most associated with advocating for which of the following? 

  1. AOption (a)

     Widow remarriage  

  2. BOption (b)

    Improved sanitation systems in Bombay 

  3. COption (c)

    Universal primary education

  4. DOption (d)

    Abolition of child labour

View answer & explanation

Correct answer

Answer: (a)A.

 Widow remarriage  

Why this answer is correct

The correct answer is Widow remarriage.

Key Points

  • Karsandas Mulji, a prominent social reformer of 19th-century India, was a vigorous advocate for widow remarriage, challenging societal norms and superstitions.
  • He worked relentlessly to promote the rights and dignity of widows, who were often marginalized and subjected to severe restrictions in traditional Indian society.
  • Mulji was influenced by the ideas of Raja Rammohan Roy and other reformers who sought to abolish regressive practices and uplift women.
  • His advocacy was part of the broader social reform movement in colonial India, focusing on issues such as women's empowerment and equality.
  • The Hindu Widows' Remarriage Act of 1856, passed earlier with the efforts of reformers like Ishwar Chandra Vidyasagar, inspired Mulji to continue working towards its wider acceptance in society.

Additional Information

  • Improved sanitation systems in Bombay
  • During the 19th century, efforts to improve sanitation in Bombay (now Mumbai) were largely spearheaded by British colonial authorities and urban planners, rather than individual reformers like Karsandas Mulji.
  • The Bombay City Improvement Trust (established in 1898) was instrumental in addressing issues like overcrowding and poor sanitation in the city.
  • Mulji's contributions were more aligned with social and cultural reforms rather than urban planning or sanitation.
  • Universal primary education
  • While education reforms were a significant aspect of the 19th-century reform movements, Mulji did not specifically focus on promoting universal primary education.
  • Efforts in this domain were led by reformers like Gopal Krishna Gokhale, who advocated for free and compulsory education for children in British India.
  • The push for universal education gained momentum in the 20th century with the establishment of policies and acts under both colonial and post-independence governments.
  • Abolition of child labour
  • The abolition of child labor gained attention during the industrial revolution, but it was not a central theme of Karsandas Mulji's work.
  • Efforts to address child labor in India were primarily driven by legal reforms enacted by colonial authorities and later by independent India's government.
  • The Factories Act of 1881 and subsequent labor laws addressed child labor issues in industrial settings.

Question 26

Where is the Central Institute of the Indian languages located?  

  1. AOption (a)

    Mysore

  2. BOption (b)

    New Delhi

  3. COption (c)

    Amritsar

  4. DOption (d)

    Delhi

View answer & explanation

Correct answer

Answer: (a)A.

Mysore

Why this answer is correct

The correct answer is Mysore.

Key Points

  • The Central Institute of Indian Languages (CIIL) is located in Mysore, Karnataka, and was established in 1969.
  • The CIIL functions under the Ministry of Education, Government of India, and is dedicated to the research and development of Indian languages.
  • The institute aims to promote and protect the linguistic diversity of India by conducting research, training, and policy development for Indian languages.
  • CIIL provides resources and technical support to linguistic minorities and works to improve the teaching and learning of Indian languages.
  • The institute also oversees major projects such as the National Translation Mission and the Scheme for Protection and Preservation of Endangered Languages of India (SPPEL).

Additional Information

  • New Delhi
  • New Delhi is the capital of India and home to various important government institutions such as the Parliament of India, Rashtrapati Bhavan, and several ministries.
  • It houses renowned research and educational institutes like the Indian Council of Social Science Research (ICSSR), Jawaharlal Nehru University (JNU), and Indian Agricultural Research Institute (IARI).
  • However, the Central Institute of Indian Languages is not located in New Delhi.
  • Amritsar
  • Amritsar is a prominent city in Punjab, known as the spiritual and cultural center of Sikhism.
  • It is famous for the Golden Temple (Harmandir Sahib), which is a significant pilgrimage site for Sikhs worldwide.
  • While Amritsar holds historical and cultural importance, it is not associated with the Central Institute of Indian Languages.
  • Delhi
  • Delhi, distinct from New Delhi, refers to the larger metropolitan area that includes New Delhi as its core.
  • It is one of India’s most populous cities and serves as a hub for culture, politics, and education.
  • Institutes like the University of Delhi and Indian National Science Academy (INSA) are located here, but it is not the location of the CIIL.

Question 27

No ordinance shall be promulgated by the administrator of a Union territory, except after obtaining instructions from the __________________. 

  1. AOption (a)

    Governor

  2. BOption (b)

    Armed Forces General 

  3. COption (c)

    President

  4. DOption (d)

    Chief Minister 

View answer & explanation

Correct answer

Answer: (c)C.

President

Why this answer is correct

The correct answer is President.

Key Points

  • The administrator of a Union Territory (UT) does not possess independent legislative authority and must function under the supervision and direction of the central government.
  • Per Article 239 of the Indian Constitution, the President exercises authority over Union Territories through administrators appointed by him.
  • As per Article 239B, the administrator of a Union Territory is permitted to promulgate ordinances only after receiving prior instructions from the President.
  • This provision ensures that legislative decisions affecting Union Territories align with the central government's policies and constitutional framework.
  • The President’s approval is critical to maintain uniformity and administrative efficiency across Union Territories.

Additional Information

  • Governor:
  • The Governor is the constitutional head of a state and functions under Articles 153-162 of the Indian Constitution.
  • The Governor has no direct role in the legislative or administrative functioning of Union Territories.
  • Governors hold the authority to promulgate ordinances for states under Article 213, but this power does not extend to Union Territories.
  • Armed Forces General:
  • The Armed Forces General is responsible for the operational command of India’s military forces.
  • This designation does not hold legislative powers or administrative authority over Union Territories.
  • The role is unrelated to ordinance promulgation or Union Territory governance.
  • Chief Minister:
  • The Chief Minister is the elected head of government in a state and is responsible for executing state-level policies and legislation.
  • Union Territories with legislative assemblies (e.g., Delhi and Puducherry) may have Chief Ministers, but their powers are subject to the administrator’s authority and the President’s oversight.
  • In Union Territories without legislative assemblies, there is no Chief Minister, and governance is directly controlled by the administrator and central government.

Question 28

Dantidurga, the founder of the Rashtrakuta dynasty was succeeded by his uncle ________ in 756 CE.

  1. AOption (a)

    Krishna I

  2. BOption (b)

    Amoghavarsha III 

  3. COption (c)

    Amoghavarsha I 

  4. DOption (d)

    Govinda II 

View answer & explanation

Correct answer

Answer: (a)A.

Krishna I

Why this answer is correct

The correct answer is Krishna I.

Key Points

  • Dantidurga, the founder of the Rashtrakuta dynasty, established the dynasty in the mid-8th century CE and ruled until his death in 756 CE.
  • He was succeeded by his uncle Krishna I, who ascended the throne after Dantidurga's demise.
  • Krishna I is famously credited with commissioning the construction of the Kailasa Temple at Ellora, a UNESCO World Heritage Site, showcasing architectural brilliance.
  • Under Krishna I's reign, the Rashtrakuta dynasty expanded significantly, consolidating power in the Deccan region of India.
  • Krishna I was instrumental in strengthening the administrative and military frameworks of the Rashtrakuta dynasty, ensuring its stability and growth.

Additional Information

  • Amoghavarsha III:
  • Amoghavarsha III was a later ruler of the Rashtrakuta dynasty, succeeding his father Govinda IV.
  • His reign marked the decline of Rashtrakuta power as he faced challenges from Chola and other regional powers.
  • Amoghavarsha III's rule was characterized by political instability and weakening central authority.
  • Amoghavarsha I:
  • Amoghavarsha I was one of the most prominent rulers of the Rashtrakuta dynasty and is considered one of the greatest monarchs of Indian history.
  • He ruled from 814 CE to 878 CE and was known for his patronage of art, literature, and architecture.
  • Amoghavarsha I authored "Kavirajamarga," the first known literary work in Kannada, emphasizing the richness of Rashtrakuta cultural contributions.
  • His reign marked the zenith of Rashtrakuta power, with extensive territorial expansion and cultural achievements.
  • Govinda II:
  • Govinda II was the son of Krishna I and succeeded him as the ruler of the Rashtrakuta dynasty.
  • His reign was relatively short, and historical records suggest he was a weaker ruler compared to his predecessors.
  • Govinda II faced internal challenges and was eventually succeeded by his brother Dhruva Dharavarsha, who restored the dynasty's strength.

Question 29

Which medal did Aman Sehrawat win in the men's 57kg freestyle wrestling event at the Paris 2024 Olympics?

  1. AOption (a)

    Silver 

  2. BOption (b)

    No medal

  3. COption (c)

    Bronze

  4. DOption (d)

    Gold

View answer & explanation

Correct answer

Answer: (c)C.

Bronze

Why this answer is correct

The correct answer is Bronze.

Key Points

  • Aman Sehrawat won the Bronze medal in the men’s 57kg freestyle wrestling event at the Paris 2024 Olympics.
  • He became the first Indian wrestler to secure a medal in this weight category at the Paris Olympics.
  • Aman is known for his agility, technique, and determination, which have contributed to his success on the international stage.
  • This achievement marked an important milestone in his wrestling career and added to India’s overall medal tally in the Paris 2024 Olympics.
  • He has been a promising young talent in Indian wrestling, following in the footsteps of legends like Bajrang Punia and Sushil Kumar.

Additional Information

  • Sakshi Malik: The first Indian woman to win an Olympic medal in wrestling, securing a Bronze at the 2016 Rio Olympics (58kg).
  • Vinesh Phogat: A pioneering wrestler, she is the first Indian woman to win gold in both Commonwealth and Asian Games, and the first Indian woman to reach an Olympic final (Paris 2024, 50kg). She is also the only Indian woman to win multiple World Championship medals.
  • Geeta Phogat: Became the first Indian woman to qualify for the Olympics (2012) and won India's first-ever Commonwealth Games gold in wrestling (2010).
  • Babita Phogat: Commonwealth Games Gold medalist (2014) and multiple-time medalist at the Commonwealth and Asian Championships.
  • A nshu Malik: First Indian woman to win a Silver medal at the World Wrestling Championships (2021).

Question 30

What does private final consumption expenditure (PFCE) represent in the calculation of GDP?

  1. AOption (a)

    The total value of goods and services consumed by households in an economy 

  2. BOption (b)

    The total government spending on public infrastructure projects

  3. COption (c)

    The total amount of money circulating in an economy at a given point in time

  4. DOption (d)

    The total value of exports minus imports in a country's economy 

View answer & explanation

Correct answer

Answer: (a)A.

The total value of goods and services consumed by households in an economy 

Why this answer is correct

The correct answer is The total value of goods and services consumed by households in an economy.

Key Points

  • Private Final Consumption Expenditure (PFCE) refers to the total value of goods and services consumed by households in an economy during a specific period.
  • PFCE is a major component of Gross Domestic Product (GDP) and accounts for a significant proportion of economic activity in most countries.
  • It includes expenditures on durable goods (e.g., cars, appliances), non-durable goods (e.g., food, clothing), and services (e.g., healthcare, education).
  • PFCE is an indicator of the purchasing power and living standards of households in an economy.
  • PFCE data is used by policymakers and economists to evaluate consumer behavior, analyze economic trends, and design policies for economic growth.

Additional Information

  • Key Aspects of GDP:
  • Formula (Expenditure Method): GDP=C+I+G+(X−M)GDP=C+I+G+(X-M) (Consumption + Investment + Government Spending + Net Exports).
  • Types:
  • Nominal GDP: Measured at current market prices.
  • Real GDP: Adjusted for inflation, reflecting true production volume.
  • GDP Per Capita: Total GDP divided by population, indicating average individual income
  • Components: Consumption (household spending) usually makes up the largest share (65-70%).
  • Calculation Methods: Production (value-added), Expenditure (spending), and Income (income earned).

Question 31

Gautamiputra Satakarni is considered the greatest of the _____ rulers. 

  1. AOption (a)

    Satavahana

  2. BOption (b)

    Kakatiya

  3. COption (c)

    Pallava

  4. DOption (d)

    Chola

View answer & explanation

Correct answer

Answer: (a)A.

Satavahana

Why this answer is correct

The correct answer is Satavahana.

Key Points

  • Gautamiputra Satakarni was one of the greatest rulers of the Satavahana dynasty, which ruled significant parts of India around the 1st century BCE to 3rd century CE.
  • He is known for his efforts to revive the Satavahana dynasty, which had suffered significant setbacks due to foreign invasions and internal conflicts.
  • Gautamiputra Satakarni is credited with defeating the Shakas, Yavanas, and Pahlavas, restoring the glory and territorial integrity of his kingdom.
  • Under his rule, the Satavahana Empire extended over a vast territory, covering present-day Maharashtra, Andhra Pradesh, Telangana, and parts of Madhya Pradesh and Karnataka.
  • He is mentioned in the Nasik Prashasti (eulogy), composed by his mother, Gautami Balashri, which highlights his achievements, including his adherence to Vedic traditions.

Additional Information

  • Kakatiya Dynasty
  • The Kakatiya dynasty was a powerful South Indian dynasty that ruled over present-day Telangana and Andhra Pradesh from the 12th to the 14th century CE.
  • They are known for their contributions to temple architecture, including the famous Ramappa Temple, which is a UNESCO World Heritage Site.
  • The most prominent ruler of this dynasty was Rudrama Devi, one of the few female rulers in Indian history.
  • Pallava Dynasty
  • The Pallavas were a South Indian dynasty that ruled from the 3rd century to the 9th century CE, primarily in Tamil Nadu and parts of Andhra Pradesh.
  • They are renowned for their architectural achievements, including the rock-cut temples and monolithic structures of Mahabalipuram.
  • Prominent rulers include Mahendravarman I and Narasimhavarman I, who were great patrons of art and architecture.
  • Chola Dynasty
  • The Cholas were one of the longest-ruling dynasties in South India, flourishing from the 9th century to the 13th century CE.
  • Their rule extended across Tamil Nadu, parts of Karnataka, Andhra Pradesh, and even overseas territories like Sri Lanka and the Maldives.
  • The Cholas are celebrated for their administrative brilliance and monumental architecture, such as the Brihadeeswarar Temple in Thanjavur.

Question 32

Which of the following nutrients is present in raw potato?

  1. AOption (a)

    Fat

  2. BOption (b)

    Starch

  3. COption (c)

    Vitamin

  4. DOption (d)

     Protein

View answer & explanation

Correct answer

Answer: (b)B.

Starch

Why this answer is correct

The correct answer is Starch.

Key Points

  • Raw potatoes are a rich source of carbohydrates, specifically in the form of starch, which is the primary energy reserve in plants.
  • Starch constitutes approximately 15-20% of a raw potato's weight, depending on the variety.
  • Starch in raw potatoes is a complex carbohydrate, making it a valuable source of slow-releasing energy.
  • Raw potato starch contains a significant amount of resistant starch, which is not digested in the small intestine and acts as a prebiotic to promote gut health.
  • Starch is widely used in the food industry, with potatoes being one of the primary sources for commercial starch production globally.

Additional Information

  • Fat:
  • Raw potatoes contain a negligible amount of fat (approximately 0.1 grams per 100 grams).
  • Fat is a macronutrient primarily found in foods like oils, nuts, seeds, and animal products, not in raw potatoes.
  • Potatoes are considered a low-fat food, making them suitable for low-fat diets.
  • Vitamin:
  • Raw potatoes are a good source of certain vitamins, particularly vitamin C, which acts as an antioxidant and supports immune function.
  • They also contain small amounts of vitamins B6 and folate, which are essential for brain health and red blood cell production.
  • However, vitamins are not the predominant nutrient in raw potatoes compared to starch.
  • Protein:
  • Raw potatoes contain about 2 grams of protein per 100 grams.
  • The protein content in potatoes is relatively low and does not make them a significant source of protein.
  • However, the protein in potatoes contains essential amino acids, making it of good quality.

Question 33

The Iron and Steel Industry requires which of the following raw materials for production?

  1. AOption (a)

    Iron ore, coking coal and lime stone

  2. BOption (b)

    Iron ore and lime stone

  3. COption (c)

    Iron ore, copper and lime stone

  4. DOption (d)

    Iron ore and coking coal 

View answer & explanation

Correct answer

Answer: (a)A.

Iron ore, coking coal and lime stone

Why this answer is correct

The correct answer is Iron ore, coking coal and limestone.

Key Points

  • Iron ore: It is the primary raw material for producing iron and steel. The iron extracted from iron ore is used to form steel through a combination of processes, including smelting and refining.
  • Coking coal: Also known as metallurgical coal, it is used to produce coke, which serves as a reducing agent in the blast furnace during the production of steel.
  • Limestone: It acts as a flux in the steel-making process, combining with impurities and forming slag, which is removed to purify the molten steel.
  • The combination of these three raw materials ensures the production of steel with desired mechanical and chemical properties.
  • Steel production involves various processes such as smelting in blast furnaces and refining in basic oxygen furnaces or electric arc furnaces, all of which require iron ore, coking coal, and limestone.

Additional Information

  • Iron and Steel Industry:
  • The iron and steel industry is one of the most important industries globally, providing the foundation for infrastructure, transportation, and machinery.
  • Steel is produced in two main methods: integrated steel-making (using blast furnaces) and electric arc furnace steel-making (recycling scrap steel).
  • India is one of the largest producers of steel, with the availability of abundant iron ore reserves and coal resources.

Question 34

Who among the following shall be the ex officio Chairman of the Council of the States as per the Constitution of India?

  1. AOption (a)

    President  

  2. BOption (b)

    Lok Sabha Speaker

  3. COption (c)

    Prime Minister 

  4. DOption (d)

    Vice President 

View answer & explanation

Correct answer

Answer: (d)D.

Vice President 

Why this answer is correct

The correct answer is Vice President.

Key Points

  • As per Article 64 of the Constitution of India, the Vice President of India is the ex officio Chairman of the Rajya Sabha (Council of States).
  • The Vice President acts as the presiding officer of the Rajya Sabha and is responsible for ensuring its smooth functioning.
  • In the absence of the Vice President, the Deputy Chairman of Rajya Sabha presides over the proceedings.
  • The Vice President is elected by the members of the Electoral College, consisting of members of both Houses of Parliament, through a system of proportional representation.
  • The Vice President does not directly participate in the legislative discussions but ensures decorum and discipline during the sessions.

Additional Information

  • President
  • The President of India is the head of state and the Supreme Commander of the Indian Armed Forces.
  • As per Article 52, the President's role is not linked to being the Chairman of the Rajya Sabha.
  • However, the President summons and prorogues the sessions of Parliament and gives assent to bills passed by both Houses.
  • Lok Sabha Speaker
  • The Lok Sabha Speaker presides over the Lok Sabha, the lower house of Parliament.
  • The Speaker's responsibilities include maintaining order during debates, deciding on points of order, and ensuring the smooth functioning of the Lok Sabha.
  • The Speaker does not have jurisdiction over the Rajya Sabha.
  • Prime Minister
  • The Prime Minister of India is the head of the government and leads the Executive branch.
  • The Prime Minister is not a presiding officer of either house of Parliament, but he/she is the leader of the ruling party and plays a key role in policy-making and legislative processes.

Question 35

Which of the following cities was the venue for the SAFF Junior Athletics Championships 2024?

  1. AOption (a)

    New Delhi 

  2. BOption (b)

    Chennai  

  3. COption (c)

    Chandigarh

  4. DOption (d)

    Kochi

View answer & explanation

Correct answer

Answer: (b)B.

Chennai  

Why this answer is correct

The correct answer is Chennai.

Key Points

  • The SAFF Junior Athletics Championships 2024 will be hosted in Chennai, India, a major sports hub in the country.
  • Chennai has been known for its excellent sports facilities and infrastructure, which makes it an ideal venue for hosting international sporting events.
  • The event is expected to draw participants from across South Asian countries, showcasing young athletes' talent in various disciplines.
  • This championship aims to promote regional cooperation and camaraderie through sports among South Asian nations.
  • Chennai has previously hosted numerous international and national-level competitions, further establishing its reputation as a center for athletics and other sports activities.

Additional Information

  • New Delhi:
  • New Delhi, the capital city of India, is a popular venue for national and international events, including athletics championships.
  • It houses the Jawaharlal Nehru Stadium, one of the largest multipurpose stadiums in India, often used for events like the Commonwealth Games and Asian Games.
  • However, it was not chosen as the venue for the SAFF Junior Athletics Championships 2024.
  • Chandigarh:
  • Chandigarh is a planned city in northern India known for its sports facilities like the Punjab University Athletics Stadium.
  • While it has hosted various sports events, it is not the venue for the 2024 SAFF Junior Athletics Championships.
  • Kochi:
  • Kochi, located in the state of Kerala, is renowned for its sports culture and facilities, including the Jawaharlal Nehru International Stadium, commonly used for football and cricket.
  • Despite its prominence, Kochi was not selected as the host city for this specific event.

Question 36

Select the correct formula of national income.

  1. AOption (a)

    Household consumption + Government expenditure + Investment + Export − Import

  2. BOption (b)

    Household consumption + Government expenditure − Investment + Export − Import

  3. COption (c)

    Household consumption + Government expenditure + Investment − Import − Export 

  4. DOption (d)

    Household consumption + Government expenditure + Investment + Import − Export

View answer & explanation

Correct answer

Answer: (a)A.

Household consumption + Government expenditure + Investment + Export − Import

Why this answer is correct

The correct answer is Household consumption + Government expenditure + Investment + Export - Import.

Key Points

  • The formula for calculating national income is based on the expenditure approach, which considers the total spending on the final goods and services within an economy during a specific period.
  • According to this approach, national income is calculated as:

National Income = Household Consumption + Government Expenditure + Investment + (Exports - Imports).

  • Household consumption refers to the expenditure incurred by households on goods and services for personal use, such as food, clothing, housing, and entertainment.
  • Government expenditure includes all spending by the government on public goods, infrastructure, defense, education, healthcare, and other services.
  • Investment accounts for capital formation in the economy, including spending on machinery, infrastructure, and buildings.
  • Exports minus imports (Net Exports) reflects the net impact of a country's trade with the rest of the world. Positive net exports add to the national income, while negative net exports reduce it.

Additional Information

  • Key Aspects of GDP:
  • Formula (Expenditure Method): GDP=C+I+G+(X−M)GDP=C+I+G+(X-M) (Consumption + Investment + Government Spending + Net Exports).
  • Types:
  • Nominal GDP: Measured at current market prices.
  • Real GDP: Adjusted for inflation, reflecting true production volume.
  • GDP Per Capita: Total GDP divided by population, indicating average individual income.
  • Components: Consumption (household spending) usually makes up the largest share (65-70%).
  • Calculation Methods: Production (value-added), Expenditure (spending), and Income (income earned).

Question 37

The factor which influences the speed of a wave is the _______.

  1. AOption (a)

    energy of wave

  2. BOption (b)

    amplitude of wave 

  3. COption (c)

    propagation medium

  4. DOption (d)

    frequency of wave

View answer & explanation

Correct answer

Answer: (c)C.

propagation medium

Why this answer is correct

The correct answer is propagation medium.

Key Points

  • The speed of a wave depends on the properties of the medium through which it travels.
  • Density, elasticity, and tension of the medium affect speed.
  • Different media allow waves to travel at different speeds.

Additional Information

  • Energy of wave 
  • Energy depends on amplitude, not wave speed.
  • Increasing energy does not change the speed of the wave.
  • Wave speed remains constant for a given medium.
  • Amplitude of wave 
  • Amplitude affects the height/intensity of the wave.
  • It does not influence how fast the wave travels.
  • Speed remains unchanged even if amplitude increases.
  • Frequency of wave 
  • Frequency is set by the source of the wave.
  • Changing frequency changes wavelength, not speed.
  • In the same medium, wave speed stays constant.

Question 38

In 1965, which language was given the status of an 'associate additional official language' of the Union of India and of inter-provincial communication? 

  1. AOption (a)

    Urdu

  2. BOption (b)

    Sanskrit

  3. COption (c)

    English

  4. DOption (d)

    Hindi

View answer & explanation

Correct answer

Answer: (c)C.

English

Why this answer is correct

The correct answer is English.

Key Points

  • In 1965, English was given the status of an "associate additional official language" of the Union of India alongside Hindi.
  • This provision was made under the Official Languages Act, 1963, to address linguistic diversity and ensure smooth communication across states.
  • The decision arose from concerns among non-Hindi-speaking states, particularly in South India, about the imposition of Hindi as the sole official language.
  • Article 343 of the Indian Constitution originally stipulated Hindi in the Devanagari script as the official language, with English intended for use only for 15 years post-Independence (1947-1965).
  • To accommodate regional linguistic diversity and facilitate inter-state communication, English has continued to serve as an associate official language to date.

Additional Information

  • Urdu:
  • Urdu is one of the 22 scheduled languages of India as per the Eighth Schedule of the Indian Constitution.
  • It is widely spoken in states like Uttar Pradesh, Bihar, Telangana, and Jammu & Kashmir and is considered a language of cultural and historical significance.
  • However, it was not granted the status of associate official language in 1965.
  • Sanskrit:
  • Sanskrit, an ancient Indian language, is often referred to as the "mother of all languages" due to its influence on many Indian languages.
  • It holds cultural and historical importance but is not widely used as a language of daily communication.
  • Sanskrit is one of the 22 scheduled languages of India but was not considered for associate official status.
  • Hindi:
  • Hindi, in the Devanagari script, is the official language of the Union as per Article 343 of the Indian Constitution.
  • It is the most widely spoken language in India and serves as a unifying medium for communication in many states.
  • Although Hindi is the primary official language, English was retained as an associate official language to address the needs of non-Hindi-speaking states.
  • Background on Official Languages:
  • The linguistic diversity of India necessitated the adoption of a flexible language policy to maintain national unity and administrative efficiency.
  • The Official Languages Act of 1963 ensures the continued use of English for official purposes along with Hindi.
  • This dual-language policy aims to balance the interests of Hindi-speaking and non-Hindi-speaking populations.

Question 39

Which of the following states has an agricultural marketing channel known as Rythu Bazars?

  1. AOption (a)

    Rajasthan 

  2. BOption (b)

    Pune

  3. COption (c)

     Tamil Nadu

  4. DOption (d)

    Andhra Pradesh

View answer & explanation

Correct answer

Answer: (d)D.

Andhra Pradesh

Why this answer is correct

The correct answer is Andhra Pradesh.

Key Points

  • Rythu Bazars are a unique agricultural marketing initiative launched in the state of Andhra Pradesh to ensure direct market access for farmers.
  • The concept of Rythu Bazars was introduced in 1999 under the leadership of the then Chief Minister of Andhra Pradesh, N. Chandrababu Naidu.
  • These markets aim to eliminate middlemen by providing farmers a platform to sell their produce directly to consumers at fair prices.
  • Rythu Bazars operate across various cities and towns in Andhra Pradesh and are regulated by the government to ensure transparency and fairness in transactions.
  • Such markets also ensure that consumers get fresh produce at reasonable prices while enhancing the income of small and marginal farmers.

Additional Information

  • Rajasthan:
  • Rajasthan is an agriculturally significant state but does not have a dedicated marketing initiative similar to Rythu Bazars.
  • The state focuses on agricultural innovations like drip irrigation and crop diversification due to its arid and semi-arid climate.
  • Pune:
  • Pune is a city in Maharashtra and not a state. However, Maharashtra has introduced initiatives like APMC (Agricultural Produce Market Committees) to regulate agricultural trade.
  • The state also promotes farmer-producer organizations (FPOs) to enhance agricultural marketing efficiency.
  • Tamil Nadu:
  • Tamil Nadu has introduced farmer-friendly policies and initiatives like Uzhavar Sandhai, which is similar to Rythu Bazars.
  • Uzhavar Sandhai markets allow farmers to directly sell their produce to consumers without the involvement of middlemen.

Question 40

Which of the following rivers rises west of the Rohtang Pass in the Kullu hills of Himachal Pradesh and flows through the Chamba valley of the state?

  1. AOption (a)

    Ravi

  2. BOption (b)

    Kosi

  3. COption (c)

    Padma

  4. DOption (d)

    Bhagirathi

View answer & explanation

Correct answer

Answer: (a)A.

Ravi

Why this answer is correct

The correct answer is Ravi.

Key Points

  • The Ravi River originates west of the Rohtang Pass in the Kullu hills of Himachal Pradesh, India.
  • It flows through the Chamba Valley in Himachal Pradesh, which is a prominent feature of its course.
  • The Ravi is one of the five rivers of the Punjab region, which gave the region its name ("Punj" meaning five and "ab" meaning water).
  • This river eventually joins the Chenab River in Pakistan, which is part of the Indus River system.
  • The Ravi River is historically significant and is mentioned in ancient Indian texts as the "Iravati."

Additional Information

  • Kosi River
  • The Kosi River, also known as the "Sorrow of Bihar," originates from the Tibetan Plateau, near Mount Everest, and flows through Nepal and Bihar in India.
  • It is known for its frequent course changes and devastating floods in the northern plains of Bihar.
  • The Kosi is one of the tributaries of the Ganga River system.
  • Padma River
  • The Padma River is the main distributary of the Ganga River and flows through Bangladesh.
  • It originates near the India-Bangladesh border and flows southeast, joining the Meghna River before emptying into the Bay of Bengal.
  • In India, it is referred to as the Ganga before it bifurcates into the Padma and Bhagirathi-Hooghly rivers.
  • Bhagirathi River
  • The Bhagirathi River originates from the Gangotri Glacier in Uttarakhand, India, at Gaumukh.
  • It is one of the two headstreams of the Ganga River, the other being the Alaknanda River.
  • The Bhagirathi meets the Alaknanda at Devprayag, where they together form the Ganga River.
  • Rivers of Himachal Pradesh
  • Himachal Pradesh is home to several important rivers, including the Ravi, Beas, Chenab, Sutlej, and Yamuna.
  • These rivers are part of the Indus River system and are fed by glaciers and snowmelt from the Himalayas.
  • They play a crucial role in agriculture, hydroelectric power generation, and water supply in the region.

Arithmetical Ability (20 questions)

Question 41

The simple interest (in ₹) on ₹2,900 at the rate of 5% per annum in 3 years is:

  1. AOption (a)

     385

  2. BOption (b)

    435

  3. COption (c)

    485

  4. DOption (d)

    535 

View answer & explanation

Correct answer

Answer: (b)B.

435

Why this answer is correct

Given:

Principal (P) = ₹2,900

Rate of Interest (R) = 5% per annum

Time (T) = 3 years

Formula Used:

Simple Interest (SI) = (P × R × T) / 100

Calculation:

⇒ SI = (2,900 × 5 × 3) / 100

⇒ SI = (43,500) / 100

⇒ SI = 435

∴ The correct answer is 435.

Question 42

The population of a town 3 years ago was 20,00,000. It increases at the rate of 3% per annum. One year ago, 500 people died due to an epidemic. What is the present population of the town? 

  1. AOption (a)

    21,84,939

  2. BOption (b)

    21,48,924

  3. COption (c)

    19,84,942

  4. DOption (d)

    20,84,842 

View answer & explanation

Correct answer

Answer: (a)A.

21,84,939

Why this answer is correct

Shortcut Trick

Apply compounded growth for 2 years: 20,00,000 × (1.03)2 = 21,21,800.

Apply 3rd year growth: 21,21,800 × 1.03 = 21,85,454.

Subtract epidemic deaths occurring one year ago: 21,85,454 − (500 × 1.03) = 21,85,454 − 515.

Since the death occurred one year ago, those 500 would have grown by 3% if they lived.

Actual population = 20,00,000 × (1.03)3 − 500 × (1.03)0... Wait, deaths occurred 1 year ago, so they are subtracted from the total after the 2nd year's growth.

∴ The correct answer is 21,84,939.

Alternate Method

Given: Initial Population = 20,00,000 | Rate = 3% | Time = 3 years | Deaths = 500 (1 year ago).

⇒ Population 2 years ago = 20,00,000 + 3% of 20,00,000 = 20,60,000

⇒ Population 1 year ago (before deaths) = 20,60,000 + 3% of 20,60,000 = 21,21,800

⇒ Population 1 year ago (after deaths) = 21,21,800 − 500 = 21,21,300

⇒ Present Population = 21,21,300 + 3% of 21,21,300

⇒ Present Population = 21,21,300 + 63,639 = 21,84,939

∴ The correct answer is 21,84,939.

Additional Information

Population Growth Formula

The population after n years is given by P × (1 + R/100)n, where P is the initial population and R is the growth rate.

Successive Percentage Change

When values change sequentially, use the net change formula a + b + (ab/100) or multiplying factors for each stage.

Net Population with Migration/Death

Subtract or add specific values at the exact time point they occur in the timeline before applying further growth rates.

Question 43

The population of a village was 1,70,000. If 4% of the population migrated to another town and 1% died due to an epidemic, then the present population of the village is: 

  1. AOption (a)

    1,72,568 

  2. BOption (b)

     1,61,500

  3. COption (c)

     1,61,488 

  4. DOption (d)

    1,81,568

View answer & explanation

Correct answer

Answer: (b)B.

 1,61,500

Why this answer is correct

Given:

Initial population = 1,70,000

Population migrated = 4% of 1,70,000

Population died = 1% of 1,70,000

Formula Used:

Population migrated = Initial population × (Percentage migrated / 100)

Population died = Initial population × (Percentage died / 100)

Present population = Initial population - (Population migrated + Population died)

Calculation:

⇒ Population migrated = 1,70,000 × (4 / 100)

⇒ Population migrated = 6,800

⇒ Population died = 1,70,000 × (1 / 100)

⇒ Population died = 1,700

⇒ Present population = 1,70,000 - (6,800 + 1,700)

⇒ Present population = 1,70,000 - 8,500

⇒ Present population = 1,61,500

∴ The correct answer is 1,61,500.

Question 44

The simple interest (in ₹) on ₹2,900 at the rate of 6% per annum in 3 years is:

  1. AOption (a)

    572

  2. BOption (b)

    472

  3. COption (c)

    522

  4. DOption (d)

    622

View answer & explanation

Correct answer

Answer: (c)C.

522

Why this answer is correct

Given:

Principal (P) = ₹2,900

Rate of interest (R) = 6%

Time (T) = 3 years

Formula Used:

Simple Interest (SI) = (P × R × T) / 100

Calculation:

⇒ SI = (2900 × 6 × 3) / 100

⇒ SI = (52200) / 100

⇒ SI = ₹522

∴ The correct answer is ₹522.

Question 45

The average price of three items of furniture is ₹17,835. If their prices are in the ratio 3 : 5 : 7, the price of the cheapest item (in ₹) is:

  1. AOption (a)

    3,567

  2. BOption (b)

    5,945

  3. COption (c)

    8,323 

  4. DOption (d)

    10,701 

View answer & explanation

Correct answer

Answer: (d)D.

10,701 

Why this answer is correct

Given:

Average price of three items = ₹17,835

Ratio of prices = 3 : 5 : 7

Formula Used:

Total price = Average price × Number of items

Price of cheapest item = (Ratio of cheapest item / Sum of ratios) × Total price

Calculation:

⇒ Total price = ₹17,835 × 3

⇒ Total price = ₹53,505

⇒ Sum of ratios = 3 + 5 + 7

⇒ Sum of ratios = 15

⇒ Price of cheapest item = (3 / 15) × ₹53,505

⇒ Price of cheapest item = ₹10,701

∴ The correct answer is ₹10,701.

Question 46

The average price of three items of furniture is ₹17,805. If their prices are in the ratio 3 : 5 : 7, the price of the cheapest item (in ₹) is: 

  1. AOption (a)

     5,935

  2. BOption (b)

    10,683

  3. COption (c)

    3,561

  4. DOption (d)

    8,309

View answer & explanation

Correct answer

Answer: (b)B.

10,683

Why this answer is correct

Given:

Average price of three items = ₹17,805

Ratio of their prices = 3 : 5 : 7

Formula Used:

Sum of items = Average × Number of items

Individual value = (Ratio of item / Sum of ratios) × Total sum

Calculation:

⇒ Sum of items = ₹17,805 × 3

⇒ Sum of items = ₹53,415

⇒ Sum of ratios = 3 + 5 + 7 = 15

⇒ Price of cheapest item = (3 / 15) × ₹53,415

⇒ Price of cheapest item = ₹10,683

∴ The correct answer is ₹10,683.

Question 47

Three years back, the population of a village was 20,00,000. It decreased by 4% in the first year, but increased by 5% during the next year. Finally, it increased by 10% in the third year. Find the total increase in the population presently (at the end of three years).

  1. AOption (a)

    2,17,600

  2. BOption (b)

    2,21,600 

  3. COption (c)

    2,15,700

  4. DOption (d)

     2,17,800 

View answer & explanation

Correct answer

Answer: (a)A.

2,17,600

Why this answer is correct

Given:

Initial population = 20,00,000

Decrease in 1st year = 4%

Increase in 2nd year = 5%

Increase in 3rd year = 10%

Formula Used:

Population after decrease/increase = Previous population × (1 ± percentage change/100)

Calculation:

⇒ Population after 1st year = 20,00,000 × (1 - 4/100)

⇒ Population after 1st year = 20,00,000 × 0.96

⇒ Population after 1st year = 19,20,000

⇒ Population after 2nd year = 19,20,000 × (1 + 5/100)

⇒ Population after 2nd year = 19,20,000 × 1.05

⇒ Population after 2nd year = 20,16,000

⇒ Population after 3rd year = 20,16,000 × (1 + 10/100)

⇒ Population after 3rd year = 20,16,000 × 1.10

⇒ Population after 3rd year = 22,17,600

⇒ Total increase in population = Final population - Initial population

⇒ Total increase = 22,17,600 - 20,00,000

⇒ Total increase = 2,17,600

∴ The correct answer is 2,17,600.

Question 48

An open container closed from the bottom and made up of a metal sheet is in the form of a frustum of a cone of height 12 cm with radii of its lower and upper ends as 6 cm and 15 cm, respectively. Find the cost (in ₹) of metal used if it costs ₹100 per cm2 . (Use π = 3.14)

  1. AOption (a)

    ₹1,10,214

  2. BOption (b)

    ₹1,69,560

  3. COption (c)

    ₹98,910

  4. DOption (d)

    ₹1,80,864 

View answer & explanation

Correct answer

Answer: (a)A.

₹1,10,214

Why this answer is correct

Given:

Height (h) = 12 cm

Radius of lower end (r₁) = 6 cm

Radius of upper end (r₂) = 15 cm

Cost of metal per cm2 = ₹100

π = 3.14

Formula Used:

Lateral Surface Area of frustum = π × (r₁ + r₂) × l

Total Surface Area = Lateral Surface Area + Area of lower circular base

Cost = Total Surface Area × Cost per cm2

l = √(h2 + (r₂ - r₁)2)

Calculation:

⇒ l = √(122 + (15 - 6)2)

⇒ l = √(144 + 81)

⇒ l = √225

⇒ l = 15 cm

⇒ Lateral Surface Area = 3.14 × (6 + 15) × 15

⇒ Lateral Surface Area = 3.14 × 21 × 15

⇒ Lateral Surface Area = 989.1 cm2

⇒ Area of lower circular base = π × r₁2

⇒ Area of lower circular base = 3.14 × 62

⇒ Area of lower circular base = 3.14 × 36

⇒ Area of lower circular base = 113.04 cm2

⇒ Total Surface Area = 989.1 + 113.04

⇒ Total Surface Area = 1102.14 cm2

⇒ Cost = 1102.14 × 100

⇒ Cost = ₹1,10,214

∴ The correct answer is ₹1,10,214.

Question 49

If the listed price of a bag is 94% more than its cost price and a discount of 73% is announced on it, find the loss percentage. 

  1. AOption (a)

    47.62% 

  2. BOption (b)

    48.37%

  3. COption (c)

    44.41%

  4. DOption (d)

    49.61% 

View answer & explanation

Correct answer

Answer: (a)A.

47.62% 

Why this answer is correct

Given:

Listed price = 94% more than cost price

Discount = 73%

Formula Used:

Loss Percentage = [(Cost Price - Selling Price) / Cost Price] × 100

Selling Price = Listed Price × (1 - Discount/100)

Listed Price = Cost Price × (1 + Markup/100)

Calculation:

⇒ Listed Price = Cost Price × (1 + 94/100)

⇒ Listed Price = Cost Price × 1.94

⇒ Selling Price = Listed Price × (1 - 73/100)

⇒ Selling Price = Cost Price × 1.94 × 0.27

⇒ Selling Price = Cost Price × 0.5238

⇒ Loss = Cost Price - Selling Price

⇒ Loss = Cost Price - (Cost Price × 0.5238)

⇒ Loss = Cost Price × (1 - 0.5238)

⇒ Loss = Cost Price × 0.4762

⇒ Loss Percentage = (Loss / Cost Price) × 100

⇒ Loss Percentage = (0.4762 / 1) × 100

⇒ Loss Percentage = 47.62%

∴ The correct answer is 47.62%.

Question 50

Kiran starts business with ₹50,000 and after 7 months, Zarina joins with Kiran as her partner. After a year, the profit is divided in the ratio 3 : 2. What is Zarina's contribution in the capital? 

  1. AOption (a)

    ₹80,670 

  2. BOption (b)

    ₹80,000 

  3. COption (c)

    ₹78,245 

  4. DOption (d)

     ₹80,875

View answer & explanation

Correct answer

Answer: (b)B.

₹80,000 

Why this answer is correct

Given:

Kiran's initial capital = ₹50,000

Time Kiran invests = 12 months

Zarina joins after 7 months

Total time Zarina invests = 12 - 7 = 5 months

Profit ratio = 3 : 2

Formula Used:

Capital × Time = Investment Contribution

Profit ratio = Kiran's Investment Contribution : Zarina's Investment Contribution

Calculation:

⇒ Kiran's Investment Contribution = ₹50,000 × 12 = ₹600,000

⇒ Let Zarina's capital be ₹x.

⇒ Zarina's Investment Contribution = ₹x × 5

⇒ Profit ratio = Kiran's Contribution : Zarina's Contribution

⇒ 600,000 : 5x = 3 : 2

⇒ (600,000 / 5x) = (3 / 2)

⇒ 600,000 × 2 = 3 × 5x

⇒ 1,200,000 = 15x

⇒ x = 1,200,000 / 15

⇒ x = ₹80,000

∴ The correct answer is ₹80,000.

Question 51

There is 60% increase in an amount in 6 years at simple interest. What will be the compound interest (in ₹) on ₹12,00,000 after 3 years at the same rate?

  1. AOption (a)

    3,87,200 

  2. BOption (b)

    3,96,254

  3. COption (c)

    2,97,200 

  4. DOption (d)

    3,97,200

View answer & explanation

Correct answer

Answer: (d)D.

3,97,200

Why this answer is correct

Given:

Principal (P) = ₹12,00,000

Time (T) = 6 years

Simple Interest (SI) increase = 60% of the principal

Time for compound interest = 3 years

Formula Used:

Rate (R) = (SI × 100) / (P × T)

Compound Interest (CI) = P × [(1 + R / 100)T - 1]

Calculation:

⇒ SI = 60% of ₹12,00,000 = (60 / 100) × 12,00,000 = ₹7,20,000

⇒ R = (SI × 100) / (P × T) = (7,20,000 × 100) / (12,00,000 × 6)

⇒ R = 10%

⇒ CI = P × [(1 + R / 100)T - 1]

⇒ CI = 12,00,000 × [(1 + 10 / 100)3 - 1]

⇒ CI = 12,00,000 × [(1 + 0.1)3 - 1]

⇒ CI = 12,00,000 × [(1.1)3 - 1]

⇒ CI = 12,00,000 × [1.331 - 1]

⇒ CI = 12,00,000 × 0.331

⇒ CI = ₹3,97,200

∴ The correct answer is ₹3,97,200.

Question 52

X sells a laptop to Y at a loss of 28% and Y sells the laptop to Z at a profit of 40%. If Z purchased the laptop for ₹3,906, then what was the cost price (in ₹) of the laptop for X?

  1. AOption (a)

    3875

  2. BOption (b)

    3961

  3. COption (c)

    3800

  4. DOption (d)

    3953

View answer & explanation

Correct answer

Answer: (a)A.

3875

Why this answer is correct

Given:

Loss percentage for X = 28%

Profit percentage for Y = 40%

Selling price for Z = ₹3,906

Formula Used:

Cost price = Selling price / (1 ± Percentage/100)

Step-by-step calculation: CP of X → SP of X = CP of Y → SP of Y = CP of Z

Calculation:

⇒ Cost price for Z = ₹3,906

⇒ Selling price for Y = Cost price for Z / (1 + 40/100)

⇒ Selling price for Y = ₹3,906 / 1.4

⇒ Selling price for Y = ₹2,790

⇒ Cost price for X = Selling price for Y / (1 - 28/100)

⇒ Cost price for X = ₹2,790 / 0.72

⇒ Cost price for X = ₹3,875

∴ The correct answer is ₹3,875.

Question 53

A sum of money is to be distributed among X, Y, Z, W in the proportion of 5 : 2 : 4 : 3. If Z gets ₹2,00,000 more than W, then X's share (in ₹) is: 

  1. AOption (a)

    10,00,000 

  2. BOption (b)

    7,84,000 

  3. COption (c)

    11,65,000 

  4. DOption (d)

    9,50,800 

View answer & explanation

Correct answer

Answer: (a)A.

10,00,000 

Why this answer is correct

Given:

Proportion: X : Y : Z : W = 5 : 2 : 4 : 3

Z gets ₹2,00,000 more than W.

Formula Used:

Total amount = k × (5 + 2 + 4 + 3)

Z's share - W's share = ₹2,00,000

k = Constant multiplier

Calculation:

⇒ Z's share = 4k

⇒ W's share = 3k

⇒ 4k - 3k = ₹2,00,000

⇒ k = ₹2,00,000

⇒ Total amount = ₹2,00,000 × (5 + 2 + 4 + 3)

⇒ Total amount = ₹2,00,000 × 14

⇒ Total amount = ₹28,00,000

⇒ X's share = 5k = 5 × ₹2,00,000

⇒ X's share = ₹10,00,000

∴ The correct answer is ₹10,00,000.

Question 54

The simple interest (in ₹) on ₹2,900 at the rate of 5% per annum in 4 years is:

  1. AOption (a)

    630

  2. BOption (b)

    580

  3. COption (c)

    530

  4. DOption (d)

    680 

View answer & explanation

Correct answer

Answer: (b)B.

580

Why this answer is correct

Given:

Principal (P) = ₹2,900

Rate of interest (R) = 5% per annum

Time (T) = 4 years

Formula Used:

Simple Interest (SI) = (P × R × T) / 100

Calculation:

⇒ SI = (₹2,900 × 5 × 4) / 100

⇒ SI = ₹58,000 / 100

⇒ SI = ₹580

∴ The correct answer is ₹580.

Question 55

The average of 14 numbers is 94. If the first 7 numbers are 31, 33, 44, 87, 106, 70 and 14, then what will be the average of the remaining numbers? 

  1. AOption (a)

    133

  2. BOption (b)

    139

  3. COption (c)

     136

  4. DOption (d)

    129

View answer & explanation

Correct answer

Answer: (a)A.

133

Why this answer is correct

Given:

Average of 14 numbers = 94

First 7 numbers = 31, 33, 44, 87, 106, 70, 14

Formula Used:

Total sum of numbers = Average × Total numbers

Sum of remaining numbers = Total sum - Sum of first 7 numbers

Average of remaining numbers = Sum of remaining numbers / Number of remaining numbers

Calculation:

⇒ Total sum of numbers = 94 × 14

⇒ Total sum of numbers = 1316

⇒ Sum of first 7 numbers = 31 + 33 + 44 + 87 + 106 + 70 + 14

⇒ Sum of first 7 numbers = 385

⇒ Sum of remaining numbers = Total sum - Sum of first 7 numbers

⇒ Sum of remaining numbers = 1316 - 385

⇒ Sum of remaining numbers = 931

⇒ Average of remaining numbers = Sum of remaining numbers / Number of remaining numbers

⇒ Average of remaining numbers = 931 / 7

⇒ Average of remaining numbers = 133

∴ The correct answer is 133.

Question 56

The volume (in m3 ) of a cuboidal tank, whose dimensions are given as 35 m × 30 m × 2 m, is:

  1. AOption (a)

    2053

  2. BOption (b)

    2121

  3. COption (c)

    2100

  4. DOption (d)

    2088

View answer & explanation

Correct answer

Answer: (c)C.

2100

Why this answer is correct

Given:

Length = 35 m

Breadth = 30 m

Height = 2 m

Formula Used:

Volume of a cuboid = Length × Breadth × Height

Calculation:

⇒ Volume = 35 × 30 × 2

⇒ Volume = 1050 × 2

⇒ Volume = 2100 m3

∴ The correct answer is 2100.

Question 57

Shama invested three-fifth of a sum of ₹25,00,000 in a recurring deposit with a compound interest at the rate of 12% per annum compounded annually for 2 years, and the rest at simple interest for the same rate and time period. What will be the difference in the interest (in ₹) incurred on the two amounts? 

  1. AOption (a)

    1,51,750 

  2. BOption (b)

    2,41,700 

  3. COption (c)

    1,41,600

  4. DOption (d)

    1,31,610

View answer & explanation

Correct answer

Answer: (c)C.

1,41,600

Why this answer is correct

Given:

Total sum invested = ₹25,00,000

Fraction invested in recurring deposit = 3/5

Rate of compound interest = 12% per annum

Time period for compound interest = 2 years

Remaining fraction invested in simple interest = 2/5

Rate of simple interest = 12% per annum

Time period for simple interest = 2 years

Formula Used:

Compound Interest (CI) = P × (1 + R/100)T - P

Simple Interest (SI) = (P × R × T) / 100

Difference in interest = CI - SI

Calculation:

Amount invested in compound interest ⇒ (3/5) × ₹25,00,000 = ₹15,00,000

Amount invested in simple interest ⇒ (2/5) × ₹25,00,000 = ₹10,00,000

CI on ₹15,00,000:

⇒ CI = ₹15,00,000 × (1 + 12/100)2 - ₹15,00,000

⇒ CI = ₹15,00,000 × (1.12)2 - ₹15,00,000

⇒ CI = ₹15,00,000 × 1.2544 - ₹15,00,000

⇒ CI = ₹18,81,600 - ₹15,00,000

⇒ CI = ₹3,81,600

SI on ₹10,00,000:

⇒ SI = (₹10,00,000 × 12 × 2) / 100

⇒ SI = ₹2,40,000

Difference in interest:

⇒ Difference = ₹3,81,600 - ₹2,40,000

⇒ Difference = ₹1,41,600

∴ The correct answer is ₹1,41,600.

Question 58

The simple interest (in ₹) on ₹2,900 at the rate of 7% per annum in 2 years is:

  1. AOption (a)

    506

  2. BOption (b)

    356

  3. COption (c)

    456

  4. DOption (d)

    406

View answer & explanation

Correct answer

Answer: (d)D.

406

Why this answer is correct

Given:

Principal (P) = ₹2,900

Rate of Interest (R) = 7% per annum

Time (T) = 2 years

Formula Used:

Simple Interest (SI) = (P × R × T) / 100

Calculation:

⇒ SI = (2,900 × 7 × 2) / 100

⇒ SI = (40,600) / 100

⇒ SI = ₹406

∴ The correct answer is ₹406.

Question 59

Kiran spends 60% of his income. If he saves ₹96,000, then his income (in ₹) is: 

  1. AOption (a)

     2,41,000

  2. BOption (b)

     2,39,000

  3. COption (c)

    2,40,000 

  4. DOption (d)

     57,600 

View answer & explanation

Correct answer

Answer: (c)C.

2,40,000 

Why this answer is correct

Given:

Kiran spends 60% of his income.

He saves ₹96,000.

Formula Used:

Total income = Savings / (1 - Spending percentage).

Calculation:

⇒ Spending percentage = 60% = 60 / 100 = 0.6

⇒ Savings percentage = 1 - 0.6 = 0.4

⇒ Total income = ₹96,000 / 0.4

⇒ Total income = ₹2,40,000

∴ The correct answer is ₹2,40,000.

Question 60

A cricketer has an average of 54 runs over 8 innings. In the 9th inning, he scores 267 runs. By how much does his average (in runs) increase? (Round off your answer to the nearest whole number) 

  1. AOption (a)

    21

  2. BOption (b)

    20

  3. COption (c)

    23

  4. DOption (d)

    24

View answer & explanation

Correct answer

Answer: (d)D.

24

Why this answer is correct

Given:

Average runs over 8 innings = 54

Runs scored in 9th inning = 267

Total innings = 9

Formula Used:

Total runs = Average × Number of innings

New average = Total runs / Total innings

Increase in average = New average - Old average

Calculation:

⇒ Total runs for 8 innings = 54 × 8

⇒ Total runs for 8 innings = 432

⇒ Total runs for 9 innings = 432 + 267

⇒ Total runs for 9 innings = 699

⇒ New average = 699 / 9

⇒ New average = 77.67

⇒ Increase in average = 77.67 - 54

⇒ Increase in average = 23.67

⇒ Rounded increase in average = 24

∴ The correct answer is 24.

English Language (20 questions)

Question 61

Select the most appropriate ANTONYM of the highlighted word in the given sentence.

Her ostentatious display of wealth was off-putting to many.

  1. AOption (a)

    Extravagant

  2. BOption (b)

    Flamboyant

  3. COption (c)

    Restrained

  4. DOption (d)

    Pretentious

View answer & explanation

Correct answer

Answer: (c)C.

Restrained

Why this answer is correct

The correct answer is: Option 3 i.e. Restrained.

Key Points

  • The word "ostentatious" means characterized by vulgar or pretentious display; designed to impress or attract notice. (दिखावटी)
  • Example: She wore an ostentatious necklace to the party, which caught everyone’s attention.
  • "Restrained" refers to being characterized by moderation or reserve; not excessive or extravagant. (संयमित)
  • Example: His restrained response to criticism showed his maturity and professionalism.
  • Hence, the opposite of 'ostentatious' is 'restrained', as it conveys the idea of moderation and simplicity, which is the antonym of being showy or extravagant.

Therefore, the correct answer is: Restrained.

Additional Information

Here are the other options explained along with their Hindi meanings and example sentences:

  • Extravagant (फिजूलखर्च): Lacking restraint in spending money or using resources.
  • Example: His extravagant lifestyle led to his financial downfall.
  • Flamboyant (चमकदार): Tending to attract attention because of their exuberance, confidence, and stylishness.
  • Example: The actor's flamboyant outfit at the event caught everyone’s eye.
  • Pretentious (दिखावटी): Attempting to impress by affecting greater importance, talent, culture, etc., than is actually possessed.
  • Example: His pretentious remarks made him seem insincere to the audience.

Question 62

Select the most appropriate option that best fits the given description.

Writers frequently use subtle clues within their narratives to prepare readers for upcoming events. These hints, woven carefully into the story, create anticipation and suspense. Recognizing this literary technique helps readers understand how authors foreshadow significant moments that will unfold later in the plot.

  1. AOption (a)

    Foreshadowing

  2. BOption (b)

    Synecdoche

  3. COption (c)

    Metaphor

  4. DOption (d)

    Flashback

View answer & explanation

Correct answer

Answer: (a)A.

Foreshadowing

Why this answer is correct

The correct answer is: Foreshadowing.

Key Points

  • "Foreshadowing" is a literary technique where authors provide subtle hints or clues about events that will occur later in the story. (पूर्वाभास)
  • Example: In a mystery novel, the author might mention a seemingly unimportant object that later becomes crucial to solving the case.
  • Foreshadowing creates anticipation and suspense for readers, preparing them for significant plot developments. (पूर्वाभास कहानी में आने वाले घटनाओं की ओर इशारा करता है और पाठकों को तैयार करता है।)

Therefore, the correct answer is: Foreshadowing.

Additional Information

Here are the other options explained along with their Hindi meanings and example sentences:

  • Synecdoche (अंशात्मक): A figure of speech in which a part of something represents the whole, or vice versa.
  • Example: Referring to a car as "wheels" is an example of synecdoche.
  • Metaphor (रूपक): A figure of speech that directly compares two different things without using "like" or "as."
  • Example: "Time is a thief" is a metaphor suggesting that time takes away valuable moments in life.
  • Flashback (पुनरावलोकन): A literary technique where past events are described in the narrative to provide context or explain the present.
  • Example: In a story, a character might recall childhood memories to explain their current actions.

Question 63

Select the most appropriate option to fill in the blank.

Tara is __________ her friend Priya.

  1. AOption (a)

    elder from

  2. BOption (b)

    elder to 

  3. COption (c)

    oldest than

  4. DOption (d)

     older than 

View answer & explanation

Correct answer

Answer: (d)D.

 older than 

Why this answer is correct

The correct answer is 'older than'.

 

Key Points

  • The correct phrase to compare age is "older than" and not "elder from" or "elder to".
  • The word "elder" is used without "than" and typically in contexts of family relationships (e.g., "my elder brother").
  • Option 3 ("oldest than") is incorrect because "oldest" is the superlative form and does not fit the comparison here.

Therefore, the correct answer is Option 4.

 

Complete Sentence: "Tara is older than her friend Priya."

 

Additional Information

  • Option 1: "elder from" is incorrect because "from" is not used in comparisons of age.
  • Option 2: "elder to" is incorrect because "elder" is not used with "to" for comparisons.
  • Option 3: "oldest than" is grammatically incorrect as "oldest" is a superlative and should not be used with "than."

Question 64

Select the most appropriate option to fill in the blank.

__________ five candidates were selected for the final round of interviews.

  1. AOption (a)

    As more as 

  2. BOption (b)

    As most as 

  3. COption (c)

    As much as

  4. DOption (d)

    As many as 

View answer & explanation

Correct answer

Answer: (d)D.

As many as 

Why this answer is correct

The correct answer is 'as many as'.

 

Key Points

  • The phrase "as many as" is used to indicate a specific number when referring to countable nouns (like "candidates").
  • The sentence refers to a specific quantity ("five candidates"), and since "candidates" is countable, "as many as" is appropriate.
  • Options 1, 2, and 3 are grammatically incorrect in this context.

Therefore, the correct answer is Option 4.

 

Complete Sentence: "As many as five candidates were selected for the final round of interviews."

 

Additional Information

  • Option 1: "as more as" is incorrect; it is not a valid construction in English.
  • Option 2: "as most as" is incorrect; it is not grammatically valid.
  • Option 3: "as much as" is incorrect as it is used for uncountable nouns, not countable nouns like "candidates."

Question 65

Select the most appropriate meaning of the given idiom.

By the skin of your teeth

  1. AOption (a)

     Run swiftly

  2. BOption (b)

    Escape narrowly

  3. COption (c)

    Speak confidently

  4. DOption (d)

    Walk quickly

View answer & explanation

Correct answer

Answer: (b)B.

Escape narrowly

Why this answer is correct

The correct answer is: Option 2.

Key Points

  • The idiom "By the skin of your teeth" means narrowly escaping or achieving something by a very small margin. (बहुत कम अंतर से बचना)
  • Example: He passed the exam by the skin of his teeth, scoring just above the cut-off mark.
  • Here, the phrase suggests a close call or barely managing to do something successfully.

Therefore, the correct answer is: Option 2.

Additional Information

Here are the other options explained along with their Hindi meanings and example sentences:

  • Option 1: Run swiftly (तेज़ी से दौड़ना): To move or run very fast.
  • Example: The athlete ran swiftly to secure the first position in the race.
  • Option 3: Speak confidently (आत्मविश्वास से बोलना): To express oneself with assurance and boldness.
  • Example: She spoke confidently during her job interview, impressing the panel.
  • Option 4: Walk quickly (तेज़ी से चलना): To move or proceed at a fast pace.
  • Example: He walked quickly to catch the bus before it left.

Question 66

Select the most appropriate option to fill in the blanks. If no article is required, select the option with ‘No article required’. She is an advocate for ___ rights of ___ women in rural areas. 

  1. AOption (a)

    the ; No article required 

  2. BOption (b)

    No article required ; a

  3. COption (c)

    a ; No article required

  4. DOption (d)

    the ; a

View answer & explanation

Correct answer

Answer: (a)A.

the ; No article required 

Why this answer is correct

The correct answer is 'the; No article required'.

 

Key Points

  • The definite article "the" is used before "rights" as it refers to specific rights that are being advocated.
  • No article is required before "women" because it refers to women in general, not a particular group.
  • Options 2, 3, and 4 are incorrect because they use incorrect articles or combinations that do not fit the context.

Therefore, the correct answer is Option 1.

 

Complete Sentence: "She is an advocate for the rights of women in rural areas."

 

Additional Information

  • Option 2: "No article required; a" is incorrect because "a" cannot be used before "women."
  • Option 3: "a; No article required" is incorrect because "a" cannot be used before "rights."
  • Option 4: "the; a" is incorrect because "a" cannot be used before "women."

Question 67

Select the INCORRECTLY spelt word. 

  1. AOption (a)

    Consensus

  2. BOption (b)

    Millennium

  3. COption (c)

    Occurrence

  4. DOption (d)

    Questionaire

View answer & explanation

Correct answer

Answer: (d)D.

Questionaire

Why this answer is correct

The correct answer is option 4.

Key Points

The misspelled word is 'Questionaire'.

  • The correct spelling would be 'Questionnaire'.
  • The word 'Questionnaire' is a noun which means 'a set of printed or written questions used for collecting information'.

Therefore, the correct answer would be 'Questionaire'.

Additional Information

Let's understand the meanings of the other marked words -

  • Consensus - general agreement.
  • Millennium - a period of a thousand years.
  • Occurrence - an incident or event.

Question 68

Sentences of a paragraph are given below in jumbled order. Arrange the sentences in the correct order to form a meaningful and coherent paragraph.

A) There was a notable improvement in patient outcomes as a result.

B) Doctors implemented a new treatment protocol based on recent clinical trials.

C) This protocol introduced a combination of drugs previously untested together.

D) The trials indicated a higher efficacy rate than the traditional treatment methods.

  1. AOption (a)

    B, D, C, A 

  2. BOption (b)

    A, C, B, D 

  3. COption (c)

    D, B, A, C 

  4. DOption (d)

    C, A, D, B

View answer & explanation

Correct answer

Answer: (a)A.

B, D, C, A 

Why this answer is correct

The correct answer is Option 1.

 

Key Points

  • The paragraph begins with the doctors implementing a new treatment protocol.
  • Sentence B is the first sentence as it introduces the new treatment protocol:
  • "Doctors implemented a new treatment protocol based on recent clinical trials."
  • Sentence D follows because it explains the evidence from trials that justified the protocol:
  • "The trials indicated a higher efficacy rate than the traditional treatment methods."
  • Sentence C is the third sentence as it describes the specifics of the protocol:
  • "This protocol introduced a combination of drugs previously untested together."
  • Sentence A is the fourth as it concludes with the positive outcome:
  • "There was a notable improvement in patient outcomes as a result."
  • The correct sequence is BDCA.

 

Coherent paragraph after rearrangement:

"Doctors implemented a new treatment protocol based on recent clinical trials. The trials indicated a higher efficacy rate than the traditional treatment methods. This protocol introduced a combination of drugs previously untested together. There was a notable improvement in patient outcomes as a result."

Question 69

Sentences of a paragraph are given below in jumbled order. Arrange the sentences in the correct order to form a meaningful and coherent paragraph.

A) The market has shown a favourable response to this innovative approach.

B) Initially, the product did not meet the expected sales targets.

C) As a result, the marketing strategy was completely revamped.

D) This included introducing more aggressive advertising and new packaging.

  1. AOption (a)

    B, C, D, A

  2. BOption (b)

    A, B, D, C

  3. COption (c)

    C, A, B, D

  4. DOption (d)

    D, B, A, C

View answer & explanation

Correct answer

Answer: (a)A.

B, C, D, A

Why this answer is correct

The correct answer is Option 1.

 

Key Points

  • The paragraph begins by highlighting the problem of poor sales performance.
  • Sentence B is the first sentence as it introduces the issue:
  • "Initially, the product did not meet the expected sales targets."
  • Sentence C follows as it explains the response to the problem:
  • "As a result, the marketing strategy was completely revamped."
  • Sentence D is the third sentence because it details the specific changes made:
  • "This included introducing more aggressive advertising and new packaging."
  • Sentence A is the fourth as it concludes with the positive outcome:
  • "The market has shown a favourable response to this innovative approach."
  • The correct sequence is BCDA.

 

Coherent paragraph after rearrangement:

"Initially, the product did not meet the expected sales targets. As a result, the marketing strategy was completely revamped. This included introducing more aggressive advertising and new packaging. The market has shown a favourable response to this innovative approach."

Question 70

Select the most appropriate meaning of the underlined proverb.

The teacher responded to the disruptive chatter saying that empty vessels make the most sound

  1. AOption (a)

    Vessels make a loud noise when they are not filled. 

  2. BOption (b)

    Quiet people are much wiser in quieter environments

  3. COption (c)

    People with less substance or knowledge often speak the loudest..

  4. DOption (d)

    Noise can be really distracting for any kind of work

View answer & explanation

Correct answer

Answer: (c)C.

People with less substance or knowledge often speak the loudest..

Why this answer is correct

The correct answer is: Option 3.

Key Points

  • The proverb "Empty vessels make the most sound" refers to people who often speak loudly or excessively but lack knowledge or substance. (खाली बर्तन सबसे अधिक शोर करते हैं)
  • Example: During the meeting, it was evident that the person constantly interrupting others had little understanding of the topic.
  • "Disruptive chatter" refers to unnecessary or loud speaking that disturbs the environment. (विघटनकारी बात)
  • Example: The students’ disruptive chatter distracted others during the class.
  • Hence, the proverb highlights how people with less knowledge or substance often make the most noise.

Therefore, the correct answer is: Option 3.

Additional Information

Here are the other options explained along with their Hindi meanings and example sentences:

  • Option 1: Vessels make a loud noise when they are not filled (खाली बर्तन जोर से शोर करते हैं): This is a literal interpretation of the proverb, not its intended metaphorical meaning.
  • Example: When I dropped the empty pot, it made a loud noise.
  • Option 2: Quiet people are much wiser in quieter environments (शांत लोग शांत वातावरण में अधिक समझदार होते हैं): This is unrelated to the meaning of the proverb and focuses on a different context entirely.
  • Example: Introverts often excel in calm and focused settings.
  • Option 4: Noise can be really distracting for any kind of work (शोर किसी भी काम के लिए वास्तव में विचलित कर सकता है): While true, this does not relate to the proverb’s meaning about people with less knowledge speaking loudly.
  • Example: The construction noise outside was distracting during the exam.

Question 71

Select the most appropriate option to fill in the blanks.

I found ______ interesting article on language in _______ Times of India.

  1. AOption (a)

    the, a

  2. BOption (b)

    a, the

  3. COption (c)

    no article, the

  4. DOption (d)

    an, the

View answer & explanation

Correct answer

Answer: (d)D.

an, the

Why this answer is correct

The correct answer is 'an, the'.

 

Key Points

  • The article "an" is used before words that start with a vowel sound.
  • The article "the" is used before the names of specific newspapers, such as "The Times of India."
  • Options 1, 2, and 3 are grammatically incorrect in this context.

Therefore, the correct answer is Option 4.

 

Complete Sentence: "I found an interesting article on language in the Times of India."

 

Additional Information

  • Option 1: "the, a" is incorrect because "the" is not appropriate before "interesting article".
  • Option 2: "a, the" is incorrect because "a" cannot be used before a word starting with a vowel sound.
  • Option 3: "no article, the" is incorrect because an article is required before "interesting article".

Question 72

Select the most appropriate ANTONYM of the highlighted word in the given sentence.

After the long journey, he felt lethargic and unwilling to do anything.

  1. AOption (a)

    Listless

  2. BOption (b)

    Torpid

  3. COption (c)

    Energetic

  4. DOption (d)

    Sluggish

View answer & explanation

Correct answer

Answer: (c)C.

Energetic

Why this answer is correct

The correct answer is: Energetic.

Key Points

  • The word "lethargic" means lacking energy, feeling drowsy, or sluggish. It is used to describe someone who is unwilling or unable to act due to tiredness or lack of motivation. (सुस्त, आलसी)
  • Example: After staying awake all night, she felt so lethargic that she could barely keep her eyes open.
  • "Energetic" is the opposite of lethargic. It means full of energy, active, and enthusiastic. (ऊर्जावान)
  • Example: The children were so energetic after eating sweets that they played for hours without a break.
  • Hence, the antonym of 'lethargic' is 'energetic'.

Therefore, the correct answer is: Energetic.

Additional Information

Here are the other options explained along with their Hindi meanings and example sentences:

  • Listless (उदासीन): Lacking energy or enthusiasm, similar to lethargic.
  • Example: She felt listless and uninterested in the work assigned to her.
  • Torpid (निष्क्रिय ): Mentally or physically inactive; sluggish.
  • Example: During the winter, many animals enter a torpid state to conserve energy.
  • Sluggish (धीमा): Slow-moving or lacking in energy.
  • Example: The sluggish progress of the project frustrated the entire team.

Question 73

Select the most appropriate option to fill in the blank.

Out of all the contestants, she was the __________ to finish the race.

  1. AOption (a)

    more fast 

  2. BOption (b)

    most fast 

  3. COption (c)

    fastest

  4. DOption (d)

    faster

View answer & explanation

Correct answer

Answer: (c)C.

fastest

Why this answer is correct

The correct answer is 'fastest'.

 

Key Points

  • The word "fastest" is the superlative form of the adjective "fast."
  • The sentence is comparing all the contestants, making the superlative form "fastest" the most appropriate choice.
  • Options 1, 2, and 4 are grammatically incorrect in this context.

Therefore, the correct answer is Option 3.

 

Complete Sentence: "Out of all the contestants, she was the fastest to finish the race."

 

Additional Information

  • Option 1: "more fast" is incorrect because "more" is used for comparatives, and "fast" requires either "faster" or "fastest."
  • Option 2: "most fast" is incorrect because "most" is not the standard superlative form; the correct form is "fastest."
  • Option 4: "faster" is incorrect because "faster" is the comparative form, not the superlative form.

Question 74

Select the option which has nearly the same meaning as the underlined phrase in the sentence.

The police officer reminded the crowd that he could only act within the limits or territory within which authority may be exercised. Beyond that, another agency had to be called in to handle the situation.

  1. AOption (a)

    Sovereignty

  2. BOption (b)

    Tombstone

  3. COption (c)

    Jurisdiction

  4. DOption (d)

    Epitaph

View answer & explanation

Correct answer

Answer: (c)C.

Jurisdiction

Why this answer is correct

The correct answer is: Jurisdiction.

Key Points

  • The word "Jurisdiction" refers to the official power or authority to make legal decisions and judgments within a specific area or territory. (अधिकार क्षेत्र)
  • Example: The case was transferred to the court that had jurisdiction over the matter.
  • In the given sentence, "limits or territory within which authority may be exercised" is the meaning of jurisdiction.

Therefore, the correct answer is: Jurisdiction.

Additional Information

Here are the other options explained along with their Hindi meanings and example sentences:

  • Sovereignty (संप्रभुता): Supreme power or authority, especially of a state or nation to govern itself.
  • Example: The country fought hard to maintain its sovereignty against foreign invasion.
  • Tombstone (कब्र का पत्थर): A stone marker placed at a grave to commemorate the deceased.
  • Example: The tombstone bore a touching inscription about the life of the individual.
  • Epitaph (समाधि लेख): A phrase or statement written in memory of a person who has died, especially as an inscription on a tombstone.
  • Example: His epitaph read, "A beloved father and friend to all."

Question 75

Select the INCORRECTLY spelt word. 

  1. AOption (a)

    Occurrence

  2. BOption (b)

    Appearance

  3. COption (c)

    Committment

  4. DOption (d)

    Conclusion

View answer & explanation

Correct answer

Answer: (c)C.

Committment

Why this answer is correct

The correct answer is option 3.

Key Points

The misspelled word is 'Committment'.

  • The correct spelling would be 'Commitment'.
  • The word 'Commitment' is a noun which means 'the state or quality of being dedicated to a cause or activity'. (प्रतिबद्धता)
  • For Example -
  • His commitment to his work is truly commendable.

Therefore, the correct answer would be 'Committment'.

Additional Information

Let's understand the meanings of the other marked words -

  • Occurrence - an incident or event (घटना)
  • Appearance - the way that someone or something looks (दिखावट)
  • Conclusion - the end or finish of an event or process (निष्कर्ष)

Read the given passage and answer the questions that follow.

Technology has revolutionised education, transforming traditional classrooms and creating new opportunities for learning. The integration of digital tools and resources has enhanced the educational experience for both, students and teachers. Interactive whiteboards, tablets and educational software have replaced chalkboards and textbooks, making lessons more engaging and interactive. Students can access a wealth of information online, enabling them to conduct research and explore subjects in greater depth.

One of the most significant impacts of technology on education is the ability to personalise learning. Adaptive learning software can assess a student's strengths and weaknesses and provide customised lessons that cater to their individual needs. This personalised approach helps students learn at their own pace, ensuring they grasp fundamental concepts before moving on to more advanced topics. Additionally, online courses and educational platforms have made learning more accessible to people worldwide. Students can take classes from prestigious institutions, participate in webinars and earn certifications without leaving their homes.

Technology has also facilitated collaboration among students and teachers. Online discussion forums, video conferencing and collaborative tools like Google Docs allow students to work together on projects and assignments, regardless of their physical location. This fosters a sense of community and enhances communication skills. For teachers, technology offers tools for creating engaging lesson plans, tracking student progress and providing timely feedback. Data analytics can help identify areas where students struggle, allowing for targeted interventions.

However, the integration of technology in education also presents challenges. There is a digital divide between students who have access to technology and those who do not. Ensuring equitable access to devices and the internet is crucial for bridging this gap. Additionally, teachers need adequate training to effectively incorporate technology into their teaching practices.

In conclusion, technology has significantly impacted education, offering numerous benefits but also presenting challenges that need to be addressed. By leveraging technology effectively, we can create a more inclusive and dynamic learning environment.

Question 76

Based on Passage: View directions & passage

What has technology replaced in traditional classrooms to make lessons more engaging? 

  1. AOption (a)

    School

  2. BOption (b)

     Playground 

  3. COption (c)

    Textbooks 

  4. DOption (d)

    Teachers

View answer & explanation

Correct answer

Answer: (c)C.

Textbooks 

Why this answer is correct

The correct answer is 'Option 3'.

 

Key Points

  • Technology has replaced chalkboards and textbooks in traditional classrooms with interactive whiteboards, tablets, and educational software.
  • This can be inferred from the passage, which states: "Interactive whiteboards, tablets and educational software have replaced chalkboards and textbooks, making lessons more engaging and interactive."
  • Options like ‘school’, ‘playground’, and ‘teachers’ are not mentioned as being replaced in the passage.
  • The passage specifically refers to the replacement of traditional teaching tools and materials, not the broader school environment or teachers themselves.

Therefore, the correct answer is Option 3: Textbooks.

 

Additional Information

  • Option 1 (School): Incorrect, as the passage doesn’t mention schools being replaced.
  • Option 2 (Playground): Incorrect, as playgrounds are not discussed in the context of technology replacing them.
  • Option 4 (Teachers): Incorrect, as teachers are mentioned as benefiting from technology, not being replaced by it.

Question 77

Based on Passage: View directions & passage

How does adaptive learning software benefit students?

  1. AOption (a)

    It eliminates homework.

  2. BOption (b)

     It reduces education cost. 

  3. COption (c)

     It gives personalised training. 

  4. DOption (d)

    It replaces teachers.

View answer & explanation

Correct answer

Answer: (c)C.

 It gives personalised training. 

Why this answer is correct

The correct answer is 'Option 3'.

 

Key Points

  • Adaptive learning software provides customised lessons tailored to each student's strengths and weaknesses, offering personalised training.
  • According to the passage: "Adaptive learning software can assess a student's strengths and weaknesses and provide customised lessons that cater to their individual needs. This personalised approach helps students learn at their own pace..."
  • It does not mention eliminating homework, reducing education cost, or replacing teachers as direct benefits.

Therefore, the correct answer is Option 3: It gives personalised training.

 

Additional Information

  • Option 1 (It eliminates homework): Incorrect, as the passage does not mention homework elimination.
  • Option 2 (It reduces education cost): Incorrect, as cost reduction is not discussed as a benefit of adaptive learning software.
  • Option 4 (It replaces teachers): Incorrect, because the software is described as a tool for personalisation, not as a replacement for teachers.

Question 78

Based on Passage: View directions & passage

Select the most appropriate title for the given passage. 

  1. AOption (a)

    Personalised Learning vs. Traditional Classrooms

  2. BOption (b)

    Modern Tools for Teachers

  3. COption (c)

    The Digital Divide and Its Consequences

  4. DOption (d)

    The Role of Technology in Transforming Education

View answer & explanation

Correct answer

Answer: (d)D.

The Role of Technology in Transforming Education

Why this answer is correct

The correct answer is 'Option 4'.

 

Key Points

  • The passage discusses how technology has revolutionised and transformed education, impacting students, teachers, and the overall learning environment.
  • It covers various aspects such as digital tools, personalised learning, accessibility, collaboration, benefits, and challenges of technology in education.
  • Option 4, "The Role of Technology in Transforming Education," comprehensively encapsulates all the key themes of the passage.
  • Other options are too narrow or focus only on one aspect, whereas the passage provides a broader perspective.

Therefore, the correct answer is Option 4: The Role of Technology in Transforming Education.

 

Additional Information

  • Option 1: Incorrect, as the passage covers more than just personalised vs. traditional classrooms.
  • Option 2: Incorrect, since the focus is not only on tools for teachers but also on students and the entire learning process.
  • Option 3: Incorrect, as the digital divide is discussed but not the main theme of the passage.

Question 79

Based on Passage: View directions & passage

What do you understand by inclusive and dynamic learning enviornment?

  1. AOption (a)

     Not considering diversity and maximum participation

  2. BOption (b)

    Considering diversity and minimum participation

  3. COption (c)

    Considering diversity and maximum participation 

  4. DOption (d)

    Not considering diversity and minimum participation

View answer & explanation

Correct answer

Answer: (c)C.

Considering diversity and maximum participation 

Why this answer is correct

The correct answer is 'Option 3'.

 

Key Points

  • An inclusive learning environment considers the diversity of learners, accommodating different backgrounds, abilities, and learning needs.
  • A dynamic learning environment encourages maximum participation, engagement, and adaptability.
  • The passage mentions that leveraging technology can help create a more inclusive and dynamic environment, meaning that all students are considered and actively involved.

Therefore, the correct answer is Option 3: Considering diversity and maximum participation.

 

Additional Information

  • Option 1: Incorrect, as it excludes diversity and maximum participation.
  • Option 2: Incorrect, as minimum participation does not reflect a dynamic environment.
  • Option 4: Incorrect for the same reasons as Option 1.

Question 80

Based on Passage: View directions & passage

Which of the following can be inferred from the passage? 

  1. AOption (a)

    The use of technology reduces the need for communication. 

  2. BOption (b)

    Adaptive software allows students to progress at their own pace.

  3. COption (c)

    Technology has eliminated all educational inequalities.

  4. DOption (d)

    Students today prefer textbooks over online resources. 

View answer & explanation

Correct answer

Answer: (b)B.

Adaptive software allows students to progress at their own pace.

Why this answer is correct

The correct answer is 'Option 2'.

 

Key Points

  • The passage states: "This personalised approach helps students learn at their own pace, ensuring they grasp fundamental concepts before moving on to more advanced topics." This directly supports Option 2.
  • Option 1 is incorrect because the passage mentions that technology enhances communication and collaboration, not reduces it.
  • Option 3 is incorrect because the passage highlights the existence of a digital divide, indicating that educational inequalities still exist.
  • Option 4 is incorrect as the passage states that students can access a wealth of information online, making no claim that they prefer textbooks over online resources.

Therefore, the correct answer is Option 2: Adaptive software allows students to progress at their own pace.

 

Additional Information

  • Option 1: Incorrect, as technology fosters communication and community.
  • Option 3: Incorrect, since educational inequalities still exist due to the digital divide.
  • Option 4: Incorrect, as the passage indicates a shift towards online resources.

Hindi Language (20 questions)

Question 81

निम्नलिखित वाक्य का सही क्रम क्या होगा ? 

  1. AOption (a)

    ने मुझसे नारायणदास कहा था ।

  2. BOption (b)

    मुझसे नारायणदास ने कहा था।

  3. COption (c)

    मुझसे ने नारायणदास कहा था । 

  4. DOption (d)

     नारायणदास मुझसे ने कहा था।

View answer & explanation

Correct answer

Answer: (b)B.

मुझसे नारायणदास ने कहा था।

Why this answer is correct

वाक्य का सही क्रम होगा - मुझसे नारायणदास ने कहा था।

Key Points

  • वाक्य का सही क्रम - मुझसे नारायणदास ने कहा था है।
  • वाक्य को तार्किक और व्याकरणिक रूप -
  • कर्ता और कारक: यहाँ 'कहने' का कार्य नारायणदास ने किया है, इसलिए 'ने' विभक्ति नारायणदास के ठीक बाद आनी चाहिए (नारायणदास ने)।
  • कर्म/गौण कर्म: 'मुझसे' यहाँ माध्यम या सुनने वाला है, जो कर्ता और मुख्य क्रिया के बीच में आता है।
  • क्रिया: 'कहा था' वाक्य के अंत में क्रिया के रूप में आएगी।

Important Pointsपदक्रम संबंधी नियम -

  • वाक्य में पहले कर्ता, फिर कर्म तथा अन्त में क्रिया आती है।
  • यदि क्रिया अकर्मक है तो वाक्य में पहले कर्ता फिर क्रिया आती है।
  • विस्मयादि बोधक शब्द वाक्य के आरंभ में आते हैं।
  • जहाँ प्रश्नवाचक वाक्यों हाँ/नहीं उत्तर वाले प्रश्नों में 'क्या' प्रश्नवाचक शब्द वाक्य के आरंभ में आते हैं
  • तथा शेष प्रश्नवाचक शब्द प्रायः वाक्य के मध्य में आते हैं।
  • क्रिया-विशेषण शब्द, क्रिया के पूर्व आते हैं।

Additional Information 

 पदक्रम संबंधी अशुद्धियाँ - 

अशुद्ध वाक्यशुद्ध वाक्य
यहाँ शुद्ध गाय का दूध मिलता है।यहाँ गाय का शुद्ध दूध मिलता है।
एक फूलों की माला लाओ।फूलों की एक माला लाओ।
केवल यहाँ दो पुस्तकें हैं।यहाँ केवल दो पुस्तकें हैं।
ताजी गाय का दूध पियो।गाय का ताजा दूध पियो।

Question 82

निम्नलिखित वाक्य कारक के आधार पर पूर्ण कीजिए।

बच्चों ________ शिक्षा एवं उनकी बेहतरी __________ अनेक नीतियां बनाई जानी चाहिए।

  1. AOption (a)

    में, के, से

  2. BOption (b)

    को, के, के

  3. COption (c)

    के, में, में

  4. DOption (d)

    की, के लिए 

View answer & explanation

Correct answer

Answer: (d)D.

की, के लिए 

Why this answer is correct

वाक्य कारक के आधार पर पूर्ण होगा - की, के लिए 

Key Points

  • पूर्ण शुद्ध वाक्य: "बच्चों की शिक्षा एवं उनकी बेहतरी के लिए अनेक नीतियां बनाई जानी चाहिए।"
  • ​"बच्चों की शिक्षा" - यहाँ 'शिक्षा' का संबंध 'बच्चों' से दर्शाया जा रहा है, इसलिए संबंध कारक (का/के/की) का प्रयोग होगा।
  • "बेहतरी के लिए" - यहाँ उद्देश्य प्रकट हो रहा है। जब किसी के हेतु या हित में कोई कार्य किया जाता है, तो वहाँ संप्रदान कारक (के लिए) का प्रयोग होता है।
  • संज्ञा या सर्वनाम का वह रूप जो हमें किन्हीं दो वस्तुओं के बीच संबंध का बोध कराता है, वह संबंध कारक कहलाता है।
  • सम्बन्ध कारक के विभक्ति चिन्ह का, के, की, ना, ने, नो, रा, रे, री आदि हैं।
  • जैसे - यह राधेश्याम का बेटा है। वह कमला की गाय है। सोने के गहने लाओ।​
  • सम्प्रदान का अर्थ ‘देना’ होता है।
  • जब वाक्य में किसी को कुछ दिया जाए या किसी के लिए कुछ किया जाए तो वहां पर सम्प्रदान कारक होता है।
  • सम्प्रदान कारक के विभक्ति चिन्ह के लिए या को हैं।
  • ​जैसे- साहिल ब्राह्मण को दान देता है। राधा गीता के लिए खाना लाई है।

Important Points हिन्दी में आठ कारक’ हैं -

कारकविभक्तियाँ
कर्ताने
कर्मको
करणसे, द्वारा
सम्प्रदानको, के लिये, हेतु
अपादानसे (अलग होने के अर्थ में)
सम्बन्धका, की, के, रा, री, रे
अधिकरणमें, पर
सम्बोधनहे! अरे! ऐ! ओ! हाय!

Additional Information 

 कारक:-

  • जो शब्द वाक्य में क्रिया का संज्ञा और सर्वनाम शब्दों के साथ संबंध बनाए, उसे कारक कहते हैं।
  • कारक चिन्ह को, से, के लिए, से, का/के/की, में, पर आदि।
  • जैसे- विद्यार्थी अध्यापक से सीखते है।

Question 83

निम्नलिखित वाक्यांश के लिए सही सार्थक शब्द अंकित कीजिए। जिसका दमन करना कठिन हो 

  1. AOption (a)

    दर्दयनीय

  2. BOption (b)

    दुर्दमनीय

  3. COption (c)

    गोपनीय

  4. DOption (d)

    गमनीय

View answer & explanation

Correct answer

Answer: (b)B.

दुर्दमनीय

Why this answer is correct

सही उत्तर है - दुर्दमनीय

Key Points

  • 'जिसका दमन करना कठिन हो' वाक्यांश के लिए एक शब्द होगा - दुर्दमनीय
  • वाक्यांश के लिए उपयुक्त शब्द - अनेक शब्दों के लिए एक शब्द को प्रयुक्त करना ही वाक्यांश के लिए एक शब्द कहलाता है।

अन्य विकल्प -

वाक्यांशशब्द
दया करने योग्यदयनीय
जिसे गुप्त रखा जाना चाहिएगोपनीय
जहाँ जाना संभव होगमनीय

Additional Information कुछ महत्वपूर्ण वाक्यांश के लिए एक शब्द -

वाक्यांशशब्द
​जिसे बुलाया न गया होअनाहूत
​मार्ग में खाने के लिए भोजनपाथेय
​जिस स्त्री का विवाह अभी हुआ होनवोढ़ा
​किसी को मारने की इच्छाजिघांसा
​जिसने अपना ऋण पूरा चुका दिया होउऋण
​उत्तर और पूर्व के बीच की दिशाईशान

Question 84

रेखांकित शब्द का सही पर्याय अंकित कीजिए।

ईश्वर से यही प्रार्थना है कि सभी का जीवन खुशियों से भरा रहे।

  1. AOption (a)

    अनुनय

  2. BOption (b)

    अनुगामी

  3. COption (c)

    अनुयायी

  4. DOption (d)

    अनुरक्ति

View answer & explanation

Correct answer

Answer: (a)A.

अनुनय

Why this answer is correct

सही उत्तर है - अनुनय

Key Points

  • वाक्य - ईश्वर से यही प्रार्थना है कि सभी का जीवन खुशियों से भरा रहे।
  • 'प्रार्थना' का पर्यायवाची शब्द 'अनुनय' है।
  • 'प्रार्थना' के अन्य पर्यायवाची शब्द - विनती, निवेदन, माँगना, विनय, अर्ज, भक्ति, भजन, कीर्तन, पूजा।
  • पर्यायवाची - ऐसे शब्द जिनके अर्थ समान हों, पर्यायवाची शब्द कहलाते हैं।

अन्य विकल्प -

  • 'अनुगामी' के सभी पर्यायवाची शब्द - अनुयायी, अनुचर, अनुवर्ती, अनुगत, अनुग, सेवक, दास, सहचर।
  • 'अनुरक्ति' के सभी पर्यायवाची शब्द - अनुराग, आसक्ति, प्रीति, स्नेह, भक्ति, लगाओ, प्रणय, रुचि, अनुरति।

Additional Information 

 कुछ महत्वपूर्ण पर्यायवाची शब्द -

शब्दपर्यायवाची शब्द
आमआम्र, चूत, रसाल, अमृतफल, सहकार, अतिसौरभ, च्यूत।
​यमुनासूर्यसुता, सूर्यतनया, कालिंदी, अर्कजा, कृष्णा।
पक्षीविहंग, विहग, खग, पखेरू, परिंदा, चिड़िया, शकुंत।
​वृक्षतरु, द्रुम, पादप, विटप, अगम, पेड़, गाछ।
मेघघन, जलधर, वारिद, बादल, नीरद, वारिधर, पयोद, अंबुद।
​गंगासुरसरि, त्रिपथगा, देवनदी, जाह्नवी, भागीरथी।
​घरगृह, सदन, आवास, आलय, गेह, निवास, निलय, मंदिर।

Question 85

निम्नलिखित वाक्य कारक के आधार पर पूर्ण कीजिए।

बढ़ती आबादी ______ नदियों का जलस्तर घट गया है।

  1. AOption (a)

    का

  2. BOption (b)

    के लिए

  3. COption (c)

    से

  4. DOption (d)

    पर

View answer & explanation

Correct answer

Answer: (c)C.

से

Why this answer is correct

सही उत्तर है - से

Key Points

  • पूर्ण वाक्य: "बढ़ती आबादी से नदियों का जलस्तर घट गया है।"
  • वाक्य को सार्थक और व्याकरणिक रूप से शुद्ध बनाने के लिए करण कारक के चिह्न 'से' का प्रयोग किया जाएगा।
  • यहाँ 'बढ़ती आबादी' जलस्तर घटने का कारण या माध्यम है। जब एक क्रिया किसी कारण से घटित होती है।
  • वह साधन जिससे क्रिया होती है, वह करण कहलाता है। यानि, जिसकी सहायता से किसी काम को अंजाम दिया जाता, वह करण कारक कहलाता है।
  • करण कारक के दो विभक्ति चिन्ह होते है- से और के द्वारा।
  • उदाहरण -
  • अर्जुन ने जयद्रथ को बाण से मारा।
  • बालक गेंद से खेल रहे है।

Important Points हिन्दी में आठ कारक’ हैं -

कारकविभक्तियाँ
कर्ताने
कर्मको
करणसे, द्वारा
सम्प्रदानको, के लिये, हेतु
अपादानसे (अलग होने के अर्थ में)
सम्बन्धका, की, के, रा, री, रे
अधिकरणमें, पर
सम्बोधनहे! अरे! ऐ! ओ! हाय!

Additional Informationकारक:-

  • जो शब्द वाक्य में क्रिया का संज्ञा और सर्वनाम शब्दों के साथ संबंध बनाए, उसे कारक कहते हैं।
  • कारक चिन्ह को, से, के लिए, से, का/के/की, में, पर आदि।
  • जैसे- राम का घर बड़ा है।

Question 86

पूजा के लोचन सुन्दर हैं।

वाक्य का रेखांकित शब्द किसका पर्याय है?

  1. AOption (a)

    पेर

  2. BOption (b)

     हाथ

  3. COption (c)

    कान

  4. DOption (d)

    नेत्र

View answer & explanation

Correct answer

Answer: (d)D.

नेत्र

Why this answer is correct

सही उत्तर है - नेत्र

Key Points

  • वाक्य - पूजा के लोचन सुन्दर हैं।
  • 'लोचन' का पर्यायवाची शब्द 'नेत्र' है।
  • 'लोचन' के अन्य पर्यायवाची शब्द - नयन, नेत्र, चक्षु, दृग, विलोचन, अक्षि, अम्बक, दृष्टि ।
  • पर्यायवाची - ऐसे शब्द जिनके अर्थ समान हों, पर्यायवाची शब्द कहलाते हैं।

अन्य विकल्प -

  • 'पैर' के पर्यायवाची शब्द - पाँव, चरण, पाद, पग, टाँग, कदम।
  • 'हाथ' के पर्यायवाची शब्द - हस्त, कर, पाणि, भुजा, बाँह, बाजू ।
  • 'कान' के पर्यायवाची शब्द - कर्ण, श्रवण, श्रुतिपट, श्रवणेंद्रिय, श्रोत्र।

Additional Information 

 कुछ महत्वपूर्ण पर्यायवाची शब्द -

शब्दपर्यायवाची शब्द
​अश्वघोड़ा, हय, तुरंग, वाजी, घोटक, सैंधव।
कमलजलज, पंकज, सरोज, राजीव, अरविन्द, नीरज।
​पुत्रबेटा, सुत, तनय, आत्मज, जनज, लड़का, तनुज।
पृथ्वीधरा, धरती, वसुधा, भूमि, वसुंधरा, भू, इला, धरा, धरणी।
सर्पसाँप, भुजंग, विषधर, व्याल, फणी, उरग, पन्नग, नाग।
कपड़ावस्त्र, पट, वसन, अंबर, चीर , परिधान।

Question 87

निम्नलिखित वाक्य कारक के आधार पर पूर्ण कीजिए। हम रागरंग और पाश्चात्य फैशन परस्ती _______​ अपने गौरवपूर्ण अतीत को भूल गए। 

  1. AOption (a)

    से

  2. BOption (b)

    में

  3. COption (c)

    पर

  4. DOption (d)

    का

View answer & explanation

Correct answer

Answer: (b)B.

में

Why this answer is correct

सही उत्तर है - में

Key Points

  • पूर्ण वाक्य: हम रागरंग और पाश्चात्य फैशन परस्ती में अपने गौरवपूर्ण अतीत को भूल गए।
  • वाक्य को सार्थक बनाने के लिए यहाँ अधिकरण कारक की विभक्ति 'में' का प्रयोग सबसे उपयुक्त है।
  • यहाँ 'रागरंग' और 'पाश्चात्य फैशन परस्ती' एक ऐसी अवस्था या स्थिति को दर्शाते हैं, जिसमें व्यक्ति पूरी तरह डूब गया है या खो गया है।
  • अधिकरण का अर्थ होता है – आश्रय। संज्ञा का वह रूप जिससे क्रिया के आधार का बोध हो उसे अधिकरण कारक कहते हैं।
  • इसकी विभक्ति में और पर होती है। भीतर, अंदर, ऊपर, बीच आदि शब्दों का प्रयोग इस कारक में किया जाता है।
  • उदाहरण - 
  • वह कमरे में सो रहा है।
  • पेड़ पर तोता बैठा है।

Important Points हिन्दी में आठ कारक हैं -

कारकविभक्तियाँ
कर्ताने
कर्मको
करणसे, द्वारा
सम्प्रदानको, के लिये, हेतु
अपादानसे (अलग होने के अर्थ में)
सम्बन्धका, की, के, रा, री, रे
अधिकरणमें, पर
सम्बोधनहे! अरे! ऐ! ओ! हाय!

Additional Information कारक:-

  • जो शब्द वाक्य में क्रिया का संज्ञा और सर्वनाम शब्दों के साथ संबंध बनाए, उसे कारक कहते हैं।
  • कारक चिन्ह को, से, के लिए, से, का/के/की, में, पर आदि।
  • जैसे- सीता ने राम को देखा।

Question 88

निम्नलिखित वाक्य कारक के आधार पर पूर्ण कीजिए। हमारे कुछ पर्व ऐसे भी है जिन्हें राष्ट्रीय पर्व _________ ​संज्ञा दी जाती है।

  1. AOption (a)

    की

  2. BOption (b)

    में

  3. COption (c)

    से

  4. DOption (d)

    को

View answer & explanation

Correct answer

Answer: (a)A.

की

Why this answer is correct

सही उत्तर है - की

Key Points

  • पूर्ण वाक्य: "हमारे कुछ पर्व ऐसे भी हैं जिन्हें राष्ट्रीय पर्व की संज्ञा दी जाती है। जिसमें संबंध कारक (की) का प्रयोग होता है।
  • यहाँ 'राष्ट्रीय पर्व' और 'संज्ञा' (नाम) के बीच एक संबंध स्थापित किया जा रहा है। "किसकी संज्ञा?" — "राष्ट्रीय पर्व की संज्ञा।"
  • संज्ञा या सर्वनाम का वह रूप जो हमें किन्हीं दो वस्तुओं के बीच संबंध का बोध कराता है, वह संबंध कारक कहलाता है।
  • सम्बन्ध कारक के विभक्ति चिन्ह का, के, की, ना, ने, नो, रा, रे, री आदि हैं।
  • जैसे -
  • भारत के नागरिक वीर हैं।
  • यह कमला की गाय है।
  • यह राधेश्याम का बेटा है।

Important Points हिन्दी में आठ कारक’ हैं -

कारकविभक्तियाँ
कर्ताने
कर्मको
करणसे, द्वारा
सम्प्रदानको, के लिये, हेतु
अपादानसे (अलग होने के अर्थ में)
सम्बन्धका, की, के, रा, री, रे
अधिकरणमें, पर
सम्बोधनहे! अरे! ऐ! ओ! हाय!

Additional Information  

 कारक:-

  • जो शब्द वाक्य में क्रिया का संज्ञा और सर्वनाम शब्दों के साथ संबंध बनाए, उसे कारक कहते हैं।
  • कारक चिन्ह को, से, के लिए, से, का/के/की, में, पर आदि।
  • जैसे- वह पेड़ से गिर गया।

Question 89

'एक टकसाल के ढले हैं लोकोक्ति का सही अर्थ क्या है ? 

  1. AOption (a)

    आदमी नहीं सिक्के हैं.

  2. BOption (b)

    एक सिक्के के दो पहलू

  3. COption (c)

    सब एक जैसे हैं।

  4. DOption (d)

    जहाँ सिक्के ढाले जाते हैं

View answer & explanation

Correct answer

Answer: (c)C.

सब एक जैसे हैं।

Why this answer is correct

'एक टकसाल के ढले हैं' लोकोक्ति का सही अर्थ है - सब एक जैसे हैं।

Key Points

  • 'एक टकसाल के ढले हैं' का अर्थ - सब एक जैसे हैं।
  • वाक्य प्रयोग- इस विभाग के तो सभी कर्मचारी भ्रष्ट हैं, ऐसा लगता है मानो सब "एक ही टकसाल के ढले हैं"।
  • लोकोक्ति - जब कोई पूरा कथन किसी प्रसंग विशेष में उद्धत किया जाता है, लोकोक्ति कहलाता है। इसी को कहावत कहते है।
  • जैसे -  'छोटा मुँह बड़ी बात' का अर्थ - कम उम्र या अनुभव वाले मनुष्य का लम्बी-चौड़ी बातें करना। वाक्य प्रयोग - किशन तो हमेशा "छोटा मुँह बड़ी बात करता है"। ​

अन्य विकल्प -

लोकोक्तिअर्थ
​ एक सिक्के के दो पहलूएक ही चीज़ के दो विपरीत पक्ष होना।

Additional Information

  

लोकोक्तिअर्थवाक्य प्रयोग
अपनी करनी पार उतरनी​अपने बुरे कर्मों का फल भुगतना ही पड़ता है।अपने कर्मों के कारण ही रहमत जेल में है। सच ही कहा है- "अपनी करनी पार उतरनी"।
​उल्टा चोर कोतवाल को डाँटेअपना दोष स्वीकार न कर उल्टा पूछने वाले पर आरोप लगाना।गलती सुरेश ने ही की थी, मगर वह दोष अपने पड़ोसी पर लगा रहा है। "उल्टा चोर कोतवाल को डाँटे"।
​एक और एक ग्यारह होनाएकता में शक्ति होती है।स्कूल में शिक्षक बच्चों को समझा रहे थे कि "एक और एक ग्यारह होते हैं"।
​कोयले की दलाली में मुँह कालाबुरों के साथ बुराई ही मिलती हैतुम्हें हजार बार समझाया चोरी मत करो, एक दिन पकड़े जाओगे। अब भुगतो। "कोयले की दलाली में हमेशा मुँह काला ही होता है"।

Question 90

'कम बोलने वाला' वाक्यांश के लिए सार्थक शब्द कौन सा है ? 

  1. AOption (a)

    अभाषी

  2. BOption (b)

    मूक  

  3. COption (c)

    बहुभाषी

  4. DOption (d)

    मितभाषी

View answer & explanation

Correct answer

Answer: (d)D.

मितभाषी

Why this answer is correct

सही उत्तर है - मितभाषी

Key Points

  • 'कम बोलने वाला' वाक्यांश के लिए एक शब्द होगा - मितभाषी
  • वाक्यांश के लिए उपयुक्त शब्द - अनेक शब्दों के लिए एक शब्द को प्रयुक्त करना ही वाक्यांश के लिए एक शब्द कहलाता है।

अन्य विकल्प -

वाक्यांशशब्द
जिसमें भाषा न होअभाषी
जो बोल न सकता होमूक
बहुत सी भाषाएँ जानने या बोलने वालाबहुभाषी

Additional Information कुछ महत्वपूर्ण वाक्यांश के लिए एक शब्द -

वाक्यांशशब्द
​जंगल में फैलनेवाली आगदावाग्नि
​जिसे कठिनाई से जाना जा सकेदुर्ज्ञेय
​रंगमंच पर पर्दे के पीछे का स्थाननेपथ्य
​जिसकी आंखें मगर जैसी होमकराक्ष
​जो गुप्त रूप से निवास करता होछद्मवासी
​जिसका अर्थ स्वयं ही सिद्ध हैसिद्धार्थ

Question 91

निम्नलिखित वाक्य कारक के आधार पर पूर्ण कीजिए।

सुभाष चंद्र बोस ने अपने महानतम व्यक्तित्व से सम्पूर्ण विश्व _______  आश्चर्यचकित कर दिया।

  1. AOption (a)

    कि

  2. BOption (b)

    की  

  3. COption (c)

     को

  4. DOption (d)

     के

View answer & explanation

Correct answer

Answer: (c)C.

 को

Why this answer is correct

सही उत्तर है -  को

Key Points

  • पूर्ण वाक्य: "सुभाष चंद्र बोस ने अपने महानतम व्यक्तित्व से सम्पूर्ण विश्व को आश्चर्यचकित कर दिया।"
  • वाक्य में क्रिया 'आश्चर्यचकित कर दिया' का प्रभाव 'सम्पूर्ण विश्व' पर पड़ रहा है।
  • वाक्य को व्याकरणिक रूप से पूर्ण करने के लिए यहाँ कर्म कारक की विभक्ति 'को' का प्रयोग होगा।
  • संज्ञा या सर्वनाम के जिस रूप पर क्रिया का प्रभाव या फल पड़े, उसे कर्म कारक कहते हैं। कर्म के साथ ’को’ विभक्ति आती है।
  • उदाहरण -
  • माँ बच्चे को सुला रही है।
  • अध्यापक छात्र को डाँटते हैं।

Important Points  

कारकविभक्तियाँ
कर्ताने
कर्मको
करणसे, द्वारा
सम्प्रदानको, के लिये, हेतु
अपादानसे (अलग होने के अर्थ में)
सम्बन्धका, की, के, रा, री, रे
अधिकरणमें, पर
सम्बोधनहे! अरे! ऐ! ओ! हाय!

Additional Informationकारक:-

  • जो शब्द वाक्य में क्रिया का संज्ञा और सर्वनाम शब्दों के साथ संबंध बनाए, उसे कारक कहते हैं।
  • कारक चिन्ह को, से, के लिए, से, का/के/की, में, पर आदि।
  • जैसे- मोहन कुस पर बैठा है।

Question 92

वाक्य के किस भाग में त्रुटि है-

कबीर में जीवन के दंदात्मकता पक्ष को समझ लेने की अद्भुत क्षमता थी।

  1. AOption (a)

    की अद्भुत क्षमता थी

  2. BOption (b)

    जीवन के दंदात्मकता

  3. COption (c)

    पक्ष को समझ लेने

  4. DOption (d)

    कबीर में

View answer & explanation

Correct answer

Answer: (b)B.

जीवन के दंदात्मकता

Why this answer is correct

सही उत्तर है - जीवन के दंदात्मकता

Key Points

  • वर्तनी और व्याकरण के आधार पर शुद्ध वाक्य है- 
  • कबीर में जीवन के द्वन्द्वात्मकता पक्ष को समझ लेने की अद्भुत क्षमता थी।
  • अन्य विकल्प वर्तनी की दृष्टि से शुद्ध है।
  • वाक्य में लिंग, वचन, पुरुष, काल, कारक आदि का क्रिया के साथ ठीक ठीक मेल हो, उसे शुद्ध वाक्य कहते है।
  • वर्तनी - किसी शब्द में आये हुए अक्षरों को मात्राओं सहित कहने या लिखने की रीति को वर्तनी कहते हैं।

Additional Information  वर्तनी संबंधी अशुद्धि:-​

अशुद्ध वाक्यशुद्ध वाक्य
फूलों की इकाई बहुत सुंदर है।फूलों की क्यारी बहुत सुंदर है।
हमें रामायन का पाठ करना चाहिए।हमें रामायण का पाठ करना चाहिए।
दीपकों से महल प्रज्जवलित हो उठा।दीपकों से महल प्रज्वलित हो उठा।
वह गॉव की शॉति में रहता है।वह गाँव की शांति में रहता है।
गुरुजी ने अशीर्वाद दिया।गुरुजी ने आशीर्वाद दिया।

Question 93

'कान देना' मुहावरे का सही अर्थ है- 

  1. AOption (a)

    कान से कम सुनना

  2. BOption (b)

    बेध्यानी में रहना

  3. COption (c)

    कान लगाना

  4. DOption (d)

    ध्यान देना

View answer & explanation

Correct answer

Answer: (d)D.

ध्यान देना

Why this answer is correct

'कान देना' मुहावरे का सही अर्थ है- ध्यान देना

Key Points

  • 'कान देना' का अर्थ - ध्यान देना।
  • वाक्य प्रयोग - शिक्षक की बातों पर सभी छात्रों को "कान देना चाहिए"।
  • मुहावरा - ऐसे वाक्यांश, जो सामान्य अर्थ का बोध न कराकर किसी विलक्षण अर्थ को प्रकट करते है, उसे मुहावरा कहते है।
  • उदाहरण के लिए - "खटिया सेना" का अर्थ - बीमार होना। वाक्य प्रयोग - माला की माँ बुखार के कारण "खटिया सेती है"।​

अन्य विकल्प-

मुहावराअर्थ
ऊँचा सुननाकान से कम सुनना
कान पर जूँ न रेंगनाबेध्यानी में रहना
कान लगानासावधानी से ध्यान देना

Additional Information

मुहावराअर्थवाक्य प्रयोग
​अपने पैरों पर खड़ा होनास्वालंबी होनायुवकों को "अपने पैरों पर खड़े होने" पर ही विवाह करना चाहिए।
​इधर-उधर की हाँकनाबेकार की बातें करना या गप मारनामहेश हमेशा "इधर-उधर की हाँकता" रहता हैं, कभी बैठकर पढ़ता नहीं।
​उधेड़बुन में पड़ना या रहनाफिक्र या चिन्ता करनामाता-पिता अपने बच्चों के भविष्य के लिए हमेशा "उधेड़बुन में पड़े रहते हैं"।
​कलेजा मुँह का आनाभयभीत होनागुंडों को देख कर सबका "कलेजा मुँह में आ जाता है"।

Question 94

वर्तनी की दृष्टि से दिए गए वाक्य के किस अंश में त्रुटि है, पहचानें--भारत में गुरुओं के प्रति समाज का दृष्टिकोण हमेशा श्रृद्धय रहा है। 

  1. AOption (a)

    के प्रति समाज का

  2. BOption (b)

    श्रृद्धय रहा है।

  3. COption (c)

    दृष्टिकोण हमेशा

  4. DOption (d)

    भारत में गुरुओं

View answer & explanation

Correct answer

Answer: (b)B.

श्रृद्धय रहा है।

Why this answer is correct

सही उत्तर है - श्रृद्धय रहा है।

Key Points

  • वर्तनी और व्याकरण के आधार पर शुद्ध वाक्य है- भारत में गुरुओं के प्रति समाज का दृष्टिकोण हमेशा श्रद्धेय रहा है।
  • अन्य विकल्प वर्तनी की दृष्टि से शुद्ध है।
  • वाक्य में लिंग, वचन, पुरुष, काल, कारक आदि का क्रिया के साथ ठीक ठीक मेल हो, उसे शुद्ध वाक्य कहते है।
  • वर्तनी - किसी शब्द में आये हुए अक्षरों को मात्राओं सहित कहने या लिखने की रीति को वर्तनी कहते हैं।

Additional Information वर्तनी संबंधी अशुद्धि:-​

अशुद्ध वाक्यशुद्ध वाक्य
आकाश में चांदनी बिखरी है।आकाश में चाँदनी बिखरी है।
वह अपने चरन धो रहा है।वह अपने चरण धो रहा है।
यह कार्यक्रम बहुत आर्कषक है।यह कार्यक्रम बहुत आकर्षक है।
​आपका स्वास्थ कैसा है?आपका स्वास्थ्य कैसा है?
वह बहुत उज्जवल भविष्य की कामना करता है।वह बहुत उज्ज्वल भविष्य की कामना करता है।

Question 95

निम्नलिखित विकल्पों में सही वाक्य क्रम अंकित कीजिए। 

  1. AOption (a)

    कड़ी मेहनत करता नजर आता था, जो किसान पहले कृषि के लिए बैलों पर आश्रित था वह अपने खेतों को भरी धूप में जोतता।

  2. BOption (b)

    बैलों पर आश्रित था वह जो किसान पहले कृषि के लिए अपने खेतों को भरी धूप में जोतता, कड़ी मेहनत करता नजर आता था।

  3. COption (c)

    जो किसान पहले कृषि के लिए बैलों पर आश्रित था, कड़ी मेहनत करता नजर आता वह अपने खेतों को भरी धूप में था जोतता।

  4. DOption (d)

    जो किसान पहले कृषि के लिए बैलों पर आश्रित था वह अपने खेतों को भरी धूप में जोतता, कड़ी मेहनत करता नजर आता था।

View answer & explanation

Correct answer

Answer: (d)D.

जो किसान पहले कृषि के लिए बैलों पर आश्रित था वह अपने खेतों को भरी धूप में जोतता, कड़ी मेहनत करता नजर आता था।

Why this answer is correct

सही वाक्य क्रम होगा - जो किसान पहले कृषि के लिए बैलों पर आश्रित था वह अपने खेतों को भरी धूप में जोतता, कड़ी मेहनत करता नजर आता था।

Key Points

  • सही वाक्य क्रम- जो किसान पहले कृषि के लिए बैलों पर आश्रित था वह अपने खेतों को भरी धूप में जोतता, कड़ी मेहनत करता नजर आता था।
  • यह एक मिश्र वाक्य का उदाहरण है जहाँ 'जो' और 'वह' का प्रयोग परस्पर संबंध दिखाने के लिए किया गया है।

Important Pointsपदक्रम-

  • किसी वाक्य में शब्दों या पदों के व्यवस्थित होने के तरीके को कहते हैं,
  • जिससे वाक्य का सही और स्पष्ट अर्थ निकलता है;
  • हिंदी में सामान्यतः कर्ता + कर्म + क्रिया (Subject + Object + Verb) का क्रम होता है, जैसे "राम सेब खाता है"।
  • पदक्रम बदलने से वाक्य का अर्थ पूरी तरह बदल सकता है, जैसे "राम ने सीता को देखा" और "सीता ने राम को देखा"।

Additional Information 

अशुद्ध वाक्यशुद्ध वाक्य
फल मिलता है मेहनत का मीठा हमेशा।मेहनत का फल हमेशा मीठा मिलता है।
बिजली चली गई, आए घर पिताजी जब।जब पिताजी घर आए, तब बिजली चली गई।
तुम पास हो जाओगे, करोगे परिश्रम यदि।यदि तुम परिश्रम करोगे, तो पास हो जाओगे।
वह बीमार था, नहीं आया स्कूल क्योंकिवह स्कूल नहीं आया क्योंकि वह बीमार था।

गद्यांश के अनुसार दिए गए प्रश्नों का उत्तर दें -

साहित्योन्नति के साधनों में पुस्तकालयों का स्थान अत्यंत महत्त्वपूर्ण है। इनके द्वारा साहित्य के जीवन की रक्षा, पुष्टि और अभिवृद्धि होती है। पुस्तकालय सभ्यता के इतिहास का जीता-जागता गवाह है। इसी के बल पर वर्तमान भारत को अपने अतीत गौरव पर गर्व है। पुस्तकालय भारत के लिए कोई नई वस्तु नहीं है। लिपि के आविष्कार से आज तक लोग निरंतर पुस्तकों का संग्रह करते रहे हैं। पहले देवालय, विद्यालय और नृपालय इन संग्रहों के प्रमुख स्थान होते थे। इनके अतिरिक्त, विद्वज्जनों के अपने निजी पुस्तकालय भी होते थे। मुद्रणकला के आविष्कार से पूर्व पुस्तकों का संग्रह करना आजकल क तरह सरल बात न थी। आजकल साधारण स्थिति के पुस्तकालय में जितनी संपत्ति लगती है, उतनी उन दिनों कभी-कभी एक-एक पुस्तक की तैयारी में लग जाया करती थी। भारत के पुस्कालय संसारभर में अपना सानी नहीं रखते थे। प्राचीनकाल से मुगल सम्राटों के समय तक यही स्थिति रही। चीन, फारस प्रभृति सुदूरस्थित देशों से झुंड-के-झुंड विद्यानुरागी लंबी यात्राएँ करके भारत आया करते थे।

Question 96

Based on Passage: View directions & passage

उपर्युक्त गद्यांश का सर्वाधिक उचित शीर्षक क्या होगा ? 

  1. AOption (a)

    पुस्तकालय और भारत

  2. BOption (b)

    सभ्यता और संस्कृति

  3. COption (c)

    साहित्य साधना

  4. DOption (d)

    पुस्तकालय का प्रयोग

View answer & explanation

Correct answer

Answer: (a)A.

पुस्तकालय और भारत

Why this answer is correct

सही उत्तर- पुस्तकालय और भारत

Key Points गद्यांश के अनुसार-

  • गद्यांश में भारत में पुस्तकालयों के महत्व, इतिहास और गौरवपूर्ण परंपरा का वर्णन किया गया है।
  • पुस्तकालयों को साहित्य और सभ्यता का संरक्षक बताया गया है।
  • प्राचीन भारत में पुस्तक-संग्रह की समृद्ध परंपरा पर विशेष बल दिया गया है।

अन्य विकल्प:

  • सभ्यता और संस्कृति: यह विषय व्यापक है, जबकि गद्यांश का केंद्र पुस्तकालय हैं।
  • साहित्य साधना: साहित्य की साधना पर नहीं, पुस्तकालयों की भूमिका पर चर्चा है।
  • पुस्तकालय का प्रयोग: गद्यांश में प्रयोग या उपयोग विधि का वर्णन नहीं है।

Question 97

Based on Passage: View directions & passage

प्रस्तुत गद्यांश के अनुसार पुराने समय में अधिक व्यय क्यों होता था ? 

  1. AOption (a)

    अशिक्षा के करण

  2. BOption (b)

    यातायात के साधन न होने के करण

  3. COption (c)

    मुद्रण की व्यवस्था न होने के करण

  4. DOption (d)

    साहित्य की अवनति के कारण

View answer & explanation

Correct answer

Answer: (c)C.

मुद्रण की व्यवस्था न होने के करण

Why this answer is correct

सही उत्तर- मुद्रण की व्यवस्था न होने के कारण

Key Points गद्यांश के अनुसार-

  • गद्यांश में स्पष्ट रूप से कहा गया है कि मुद्रणकला के आविष्कार से पूर्व पुस्तकों का संग्रह करना सरल नहीं था।
  • एक-एक पुस्तक तैयार करने में अत्यधिक धन और समय व्यय होता था।
  • इसी कारण पुराने समय में पुस्तकों पर अधिक व्यय करना पड़ता था।

अन्य विकल्प:

  • अशिक्षा के कारण: गद्यांश में अशिक्षा का कोई उल्लेख नहीं है।
  • यातायात के साधन न होने के कारण: यात्रा का उल्लेख विद्वानों के आने के संदर्भ में है, व्यय के कारण के रूप में नहीं।
  • साहित्य की अवनति के कारण: गद्यांश साहित्य की अवनति की नहीं, उन्नति की बात करता है।

Question 98

Based on Passage: View directions & passage

'उन्नति' शब्द का विलोम है - 

  1. AOption (a)

    निम्म

  2. BOption (b)

    विकास

  3. COption (c)

    अवनति

  4. DOption (d)

    उत्कर्ष

View answer & explanation

Correct answer

Answer: (c)C.

अवनति

Why this answer is correct

सही उत्तर- अवनति

Key Points गद्यांश के अनुसार-

  • ‘उन्नति’ शब्द का अर्थ आगे बढ़ना या प्रगति करना होता है।
  • ‘अवनति’ का अर्थ पतन या गिरावट है, जो ‘उन्नति’ का विलोम है।
  • अतः ‘उन्नति’ का सही विलोम ‘अवनति’ है।

अन्य विकल्प:

  • निम्म: यह शब्द यहाँ उपयुक्त नहीं है और विलोम नहीं बनता।
  • विकास: यह ‘उन्नति’ का समानार्थी है, विलोम नहीं।
  • उत्कर्ष: यह भी ‘उन्नति’ का समानार्थी शब्द है।

Question 99

Based on Passage: View directions & passage

साहित्य की उन्नति का सबसे महत्वपूर्ण साधन क्या है ? 

  1. AOption (a)

    पुस्तकालय

  2. BOption (b)

    मुद्रा

  3. COption (c)

    समाज

  4. DOption (d)

    प्रेस

View answer & explanation

Correct answer

Answer: (a)A.

पुस्तकालय

Why this answer is correct

सही उत्तर- पुस्तकालय

Key Points गद्यांश के अनुसार-

  • गद्यांश की शुरुआत में ही साहित्य की उन्नति में पुस्तकालयों के महत्व पर बल दिया गया है।
  • पुस्तकालयों के माध्यम से साहित्य का संरक्षण, पुष्टि और अभिवृद्धि होती है।
  • इसी कारण पुस्तकालय को साहित्य की उन्नति का सबसे महत्वपूर्ण साधन माना गया है।

अन्य विकल्प:

  • मुद्रा: गद्यांश में मुद्रा का कोई उल्लेख नहीं है।
  • समाज: समाज महत्वपूर्ण है, लेकिन गद्यांश में मुख्य साधन पुस्तकालय बताए गए हैं।
  • प्रेस: मुद्रणकला का उल्लेख है, पर साहित्य की उन्नति का मुख्य साधन नहीं बताया गया।

Question 100

Based on Passage: View directions & passage

'आविष्कार' शब्द का पर्यायवाची है  

  1. AOption (a)

    चमत्कार

  2. BOption (b)

    खोज

  3. COption (c)

    सोच

  4. DOption (d)

    विज्ञान

View answer & explanation

Correct answer

Answer: (b)B.

खोज

Why this answer is correct

सही उत्तर- खोज

Key Points गद्यांश के अनुसार-

  • ‘आविष्कार’ का अर्थ किसी नई वस्तु या तथ्य की खोज करना होता है।
  • ‘खोज’ शब्द इसी अर्थ को स्पष्ट रूप से व्यक्त करता है।
  • अतः ‘आविष्कार’ का सही पर्यायवाची ‘खोज’ है।

अन्य विकल्प:

  • चमत्कार: इसका अर्थ आश्चर्यजनक घटना है, जो ‘आविष्कार’ का पर्याय नहीं है।
  • सोच: यह मानसिक प्रक्रिया है, खोज नहीं।
  • विज्ञान: यह एक क्षेत्र है, पर्यायवाची नहीं।

Discipline 1 (20 questions)

Question 101

What is observed when an iron nail is dipped in copper sulphate solution?

  1. AOption (a)

    No reaction takes place 

  2. BOption (b)

    Gas is released 

  3. COption (c)

    Nail dissolves

  4. DOption (d)

    Solution turns green and brown coating appears on nail

View answer & explanation

Correct answer

Answer: (d)D.

Solution turns green and brown coating appears on nail

Why this answer is correct

CONCEPT:

Displacement Reaction

  • A displacement reaction occurs when a more reactive metal displaces a less reactive metal from its compound.
  • This happens because the more reactive metal has a greater tendency to lose electrons and form positive ions.
  • The reactivity of metals can be determined using the reactivity series, where iron is more reactive than copper.

EXPLANATION:

  • When an iron nail is dipped in copper sulphate solution (CuSO4), a displacement reaction takes place:

Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)

Explanation of the reaction:

  • Iron (Fe) is more reactive than copper (Cu), so it displaces copper from copper sulphate.
  • Iron reacts with the sulphate ions to form ferrous sulphate (FeSO4), which turns the solution green.
  • Copper is deposited as a brown coating on the iron nail.
  • Observations:
  • The blue colour of the copper sulphate solution fades.
  • The solution turns green due to the formation of ferrous sulphate.
  • A brown coating of copper appears on the surface of the iron nail.

Therefore, the correct answer is: Solution turns green and brown coating appears on nail.

Question 102

Which type of elements typically form ionic compounds?

  1. AOption (a)

    Metalloids

  2. BOption (b)

    Two solid 

  3. COption (c)

    A metal and a non-metal 

  4. DOption (d)

    Two non-metals 

View answer & explanation

Correct answer

Answer: (c)C.

A metal and a non-metal 

Why this answer is correct

CONCEPT:

Ionic Compounds Formation

  • Ionic compounds are formed when atoms transfer electrons to achieve a stable electron configuration (usually a full outer shell).
  • This involves one element losing electrons (becoming a cation) and another gaining electrons (becoming an anion).
  • Ionic compounds typically occur between metals and non-metals because:
  • Metals tend to lose electrons due to their low ionization energy.
  • Non-metals tend to gain electrons due to their high electron affinity.

EXPLANATION:

  • Metalloids (option 1) have properties of both metals and non-metals and usually do not form ionic compounds.
  • A metal and a non-metal (option 3) is the correct answer because metals lose electrons to form positive ions, and non-metals gain electrons to form negative ions, resulting in ionic bonds.
  • Two non-metals (option 4) usually form covalent compounds by sharing electrons, not ionic compounds.

Therefore, the correct answer is A metal and a non-metal.

Question 103

Which of the following elements has the highest ionisation enthalpy? 

  1. AOption (a)

    Lithium (Li) 

  2. BOption (b)

    Potassium (K) 

  3. COption (c)

    Caesium (Cs)

  4. DOption (d)

    Sodium (Na)

View answer & explanation

Correct answer

Answer: (a)A.

Lithium (Li) 

Why this answer is correct

CONCEPT:

Ionisation Enthalpy

  • Ionisation enthalpy is the energy required to remove an electron from a neutral gaseous atom to form a positively charged ion.
  • It depends on several factors such as:
  • Atomic size: As the size of the atom increases, the outermost electron is farther from the nucleus, so ionisation enthalpy decreases.
  • Nuclear charge: A higher nuclear charge attracts the electrons more strongly, increasing ionisation enthalpy.
  • Shielding effect: More inner electrons shield the outermost electron from the nucleus, decreasing ionisation enthalpy.

EXPLANATION:

  • These elements belong to Group 1 (alkali metals) in the periodic table. In this group:
  • As we move down the group, the atomic size increases due to the addition of new electron shells.
  • As a result, the outermost electron is farther from the nucleus and experiences less nuclear attraction.
  • Consequently, the ionisation enthalpy decreases as we move down the group.
  • Among the given elements:
  • Li has the smallest atomic size and the highest ionisation enthalpy.
  • Cs has the largest atomic size and the lowest ionisation enthalpy.

Therefore, the element with the highest ionisation enthalpy is Lithium (Li).

Question 104

The valency of elements in a period:

  1. AOption (a)

    Decreases from left to right 

  2. BOption (b)

    Increases from left to right 

  3. COption (c)

    First increases then decreases 

  4. DOption (d)

    Remains constant 

View answer & explanation

Correct answer

Answer: (c)C.

First increases then decreases 

Why this answer is correct

CONCEPT:

Valency of Elements Across a Period

  • The valency of an element refers to its ability to combine with other elements, usually determined by the number of electrons in its outermost shell (valence electrons).
  • As we move across a period in the periodic table from left to right, the number of valence electrons increases sequentially.
  • Valency is determined as follows:
  • For elements on the left side, valency increases as the number of valence electrons increases (1, 2, 3, etc.).
  • Once the element reaches Group 14, valency starts to decrease as elements prefer to gain electrons instead of losing them (e.g., -3, -2, -1).

EXPLANATION:

  • In a period, valency follows this pattern:
  • For example, in Period 2:
  • Li (1 valence electron) has a valency of 1.
  • Be (2 valence electrons) has a valency of 2.
  • B (3 valence electrons) has a valency of 3, and so on.
  • As we move to C, N, O, and F, the number of valence electrons increases, but the valency starts to decrease because these elements prefer to gain electrons to complete their octet.
  • Thus, the valency first increases and then decreases across a period.

Therefore, the correct answer is First increases then decreases.

Question 105

Which of the following is the correct classification for Sodium Hydroxide?

  1. AOption (a)

    Base

  2. BOption (b)

    Acid

  3. COption (c)

    Salt

  4. DOption (d)

    Metal

View answer & explanation

Correct answer

Answer: (a)A.

Base

Why this answer is correct

CONCEPT:

Classification of Sodium Hydroxide

  • A substance can be classified as an acid, base, salt, or metal based on its chemical properties and behavior in water.
  • Sodium Hydroxide (NaOH) is a compound that dissociates in water to produce hydroxide ions (OH-).
  • A base is defined as a substance that increases the concentration of hydroxide ions (OH-) in an aqueous solution.

EXPLANATION:

  • Sodium Hydroxide (NaOH) is a strong base because:
  • It dissociates completely in water to form Na+ and OH- ions.
  • The hydroxide ions (OH-) make the solution highly basic.

Additional Information

  • Acid: Acids release H+ ions in solution, which NaOH does not.
  • Salt: Salts are formed from the neutralization of acids and bases, but NaOH is a pure base.
  • Metal: Metals are elements, whereas NaOH is a compound.

Therefore, the correct classification for Sodium Hydroxide is Base.

Question 106

 If Solution A has pH 3 and Solution B has pH 5, then which of the given options is true?

  1. AOption (a)

     [A] has 2 pH units less than [B] → 10× more H⁺

  2. BOption (b)

    [OH⁻] in A = [H⁺] in B 

  3. COption (c)

    [A] has 5× more H⁺ than [B] 

  4. DOption (d)

     [A] has 100× more H⁺ than [B] 

View answer & explanation

Correct answer

Answer: (d)D.

 [A] has 100× more H⁺ than [B] 

Why this answer is correct

CONCEPT:

pH and H⁺ Concentration Relationship

  • The pH of a solution is a measure of its acidity and is defined as:

pH = -log[H⁺]

  • Each unit decrease in pH represents a 10-fold increase in the concentration of H⁺ ions.
  • For example:
  • A solution with a pH of 3 has 10 times more H⁺ ions than a solution with a pH of 4.
  • Similarly, a solution with a pH of 3 has 100 times more H⁺ ions than a solution with a pH of 5.

EXPLANATION:

  • For Solution A:
  • pH = 3
  • [H⁺] = 10-3 M
  • For Solution B:
  • pH = 5
  • [H⁺] = 10-5 M
  • The difference in pH between Solution A and Solution B is:

5 - 3 = 2

  • Since each pH unit corresponds to a 10-fold change in [H⁺], a 2-unit difference means:

[H⁺] in Solution A = 102 × [H⁺] in Solution B

[H⁺] in Solution A = 100 × [H⁺] in Solution B

Therefore, Solution A has 100 times more H⁺ ions than Solution B, and the correct answer is Option 4.

Question 107

Which of the following is a correctly balanced chemical equation for the thermal decomposition of lead nitrate?

  1. AOption (a)

    Pb(NO₃)₂ → PbO + 2NO₂ + O₂ 

  2. BOption (b)

    2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂

  3. COption (c)

    2Pb(NO₃)₂ → PbO + NO₂ + O₂ 

  4. DOption (d)

    Pb(NO₃)₂ → PbO + NO₂ + O₂ 

View answer & explanation

Correct answer

Answer: (b)B.

2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂

Why this answer is correct

CONCEPT:

Thermal Decomposition of Lead Nitrate

  • Thermal decomposition is a chemical process in which a compound breaks down into simpler compounds or elements when heated.
  • When lead nitrate (Pb(NO₃)₂) is heated, it decomposes to form lead oxide (PbO), nitrogen dioxide (NO₂), and oxygen (O₂).
  • The balanced chemical equation for this process is crucial to ensure the law of conservation of mass is obeyed, meaning the number of atoms of each element must be the same on both sides of the equation.

EXPLANATION:

  • To balance the equation:
  • The correct balanced equation is:

2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂

Explanation:

  • On the left-hand side, there are 2 molecules of Pb(NO₃)₂, which contain 2 lead (Pb), 4 nitrogen (N), and 12 oxygen (O) atoms.
  • On the right-hand side, 2 molecules of PbO provide 2 lead (Pb) and 2 oxygen (O) atoms. 4 molecules of NO₂ provide 4 nitrogen (N) and 8 oxygen (O) atoms. Finally, 1 molecule of O₂ provides 2 oxygen (O) atoms.
  • Therefore, the total number of atoms of each element is balanced on both sides of the equation.

Therefore, the correct balanced chemical equation for the thermal decomposition of lead nitrate is 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂

Question 108

Which of the following is NOT a member of the same homologous series as the others?  

  1. AOption (a)

    C3H8

  2. BOption (b)

    C2H6 

  3. COption (c)

    CH4

  4. DOption (d)

    C3H6

View answer & explanation

Correct answer

Answer: (d)D.

C3H6

Why this answer is correct

CONCEPT:

Homologous Series

  • A homologous series is a group of organic compounds that have the same functional group and similar chemical properties.
  • Each successive member of the series differs by a CH2 group.
  • For example, alkanes (CnH2n+2) form a homologous series where each compound differs by CH2 from the next.

EXPLANATION:

  • C3H8 (propane) - It is an alkane (CnH2n+2).
  • C2H6 (ethane) - It is an alkane (CnH2n+2).
  • CH4 (methane) - It is an alkane (CnH2n+2).
  • C3H6 (propene) - It is an alkene (CnH2n).

All the compounds except for C3H6 (propene) belong to the alkane homologous series (CnH2n+2).

C3H6 (propene) belongs to the alkene homologous series (CnH2n).

Therefore, the correct answer is C3H6 (propene), as it does NOT belong to the same homologous series as the others.

Question 109

 Carbon atoms most commonly form compounds by which bonding?

  1. AOption (a)

    Ionic bonding 

  2. BOption (b)

    Covalent bonding

  3. COption (c)

    Hydrogen bonding

  4. DOption (d)

    Metallic bonding 

View answer & explanation

Correct answer

Answer: (b)B.

Covalent bonding

Why this answer is correct

CONCEPT:

Covalent Bonding

  • Carbon atoms most commonly form compounds through covalent bonding, which involves the sharing of electrons between atoms.
  • Covalent bonds occur when atoms share their valence electrons to achieve a stable electron configuration, often resembling the nearest noble gas.
  • This type of bonding allows carbon to form a wide variety of organic and inorganic compounds, including chains, rings, and complex structures.
  • Covalent bonding is particularly important in organic chemistry, as it is the primary way carbon atoms link together to form molecules like hydrocarbons, carbohydrates, proteins, and nucleic acids.

EXPLANATION:

  • Carbon has four valence electrons, and it needs four more electrons to complete its octet (8 electrons in the outer shell).
  • Instead of losing or gaining electrons (as in ionic bonding), carbon shares its valence electrons with other atoms to achieve stability.

For example:

  • In methane (CH4), carbon forms covalent bonds by sharing one electron with each of the four hydrogen atoms.
  • In ethene (C2H4), carbon atoms form a double bond, sharing two pairs of electrons between them, along with single bonds to hydrogen atoms.
  • Covalent bonding is responsible for carbon's ability to form complex and diverse structures, making it the backbone of organic chemistry.

Therefore, carbon atoms most commonly form compounds by covalent bonding.

Question 110

What happens when solutions of barium chloride and sodium sulphate are mixed?

  1. AOption (a)

    No reaction 

  2. BOption (b)

    Gas is released 

  3. COption (c)

    White ppt formation 

  4. DOption (d)

    Solution turns red

View answer & explanation

Correct answer

Answer: (c)C.

White ppt formation 

Why this answer is correct

CONCEPT:

Double Displacement Reaction and Precipitation

  • When two aqueous solutions containing ionic compounds are mixed, a double displacement reaction may occur.
  • In such reactions, the cations and anions of the two reactants exchange places to form two new compounds.
  • If one of the newly formed compounds is insoluble in water, it precipitates out as a solid, which is observed as a precipitate.

EXPLANATION:

BaCl2(aq) + Na2SO4(aq) → BaSO4(s) + 2NaCl(aq)

  • When solutions of barium chloride (BaCl2) and sodium sulphate (Na2SO4) are mixed, a double displacement reaction occurs:
  • Barium (Ba2+) from barium chloride reacts with sulphate (SO42-) from sodium sulphate to form barium sulphate (BaSO4).
  • Barium sulphate is insoluble in water, so it precipitates out as a white solid.
  • The sodium (Na+) and chloride (Cl-) ions remain dissolved in the solution as sodium chloride (NaCl).

This reaction is a classic example of a precipitation reaction.

Therefore, when barium chloride and sodium sulphate solutions are mixed, a white precipitate of barium sulphate (BaSO4) is formed.

Question 111

Plaster of Paris is chemically represented as ______. 

  1. AOption (a)

    CaCO3

  2. BOption (b)

    CaSO4

  3. COption (c)

    CaSO4 . 2H2O

  4. DOption (d)

    CaSO4 . 0.5 H2O

View answer & explanation

Correct answer

Answer: (d)D.

CaSO4 . 0.5 H2O

Why this answer is correct

CONCEPT:

Plaster of Paris (POP)

  • Plaster of Paris is a quick-setting material made from gypsum.
  • Gypsum (CaSO4·2H2O), when heated to about 150°C, loses water molecules and forms Plaster of Paris.
  • The chemical formula of Plaster of Paris is CaSO4·0.5H2O.

EXPLANATION:

  • Plaster of Paris is obtained by heating gypsum at 373 K (around 150°C). During this process, gypsum loses 1.5 molecules of water to form the hemihydrate form of calcium sulfate.
  • The reaction is as follows:

CaSO4·2H2O → CaSO4·0.5H2O + 1.5H2O

  • When mixed with water, Plaster of Paris rehydrates to form gypsum, making it harden quickly.

Additional Information

  • (CaCO3): Represents calcium carbonate (limestone), not related to Plaster of Paris.
  • (CaSO4): Represents anhydrous calcium sulfate, not the hemihydrate form.
  • (CaSO4·2H2O): Represents gypsum, the precursor to Plaster of Paris.

Therefore, the correct answer is CaSO4·0.5H2O.

Question 112

Which of the following correctly represents the trend in metallic character down a group in the modern periodic table? 

  1. AOption (a)

    Remains unchanged

  2. BOption (b)

    First increases then decreases 

  3. COption (c)

    Increases

  4. DOption (d)

    Decreases

View answer & explanation

Correct answer

Answer: (c)C.

Increases

Why this answer is correct

CONCEPT:

Metallic Character

  • Metallic character refers to the tendency of an element to lose electrons and form positive ions (cations).
  • In the modern periodic table, metallic character increases as we move down a group because:
  • The atomic size increases down a group due to the addition of electron shells.
  • The outermost electrons become farther from the nucleus, reducing the effective nuclear charge experienced by these electrons.
  • As a result, it becomes easier for the atom to lose its outermost electrons, increasing its metallic character.

EXPLANATION:

  • As we move down a group in the periodic table:
  • The number of electron shells increases, leading to an increase in the atomic radius.
  • The effective nuclear charge experienced by the outermost electrons decreases because the inner electron shells shield the outer electrons from the nucleus.
  • Due to this shielding effect, the outermost electrons are less tightly held and can be lost more easily.
  • Since metallic character is the tendency to lose electrons, this tendency increases as we move down a group.

Therefore, the correct answer is Increases.

Question 113

In the reaction between silver nitrate and potassium chloride, a white precipitate is formed. What is the precipitate in this reaction?

  1. AOption (a)

    Silver nitrate

  2. BOption (b)

    Potassium nitrate

  3. COption (c)

     Potassium chloride

  4. DOption (d)

    Silver chloride

View answer & explanation

Correct answer

Answer: (d)D.

Silver chloride

Why this answer is correct

CONCEPT:

When solutions of silver nitrate (AgNO3) and potassium chloride (KCl) are mixed, an ionic reaction occurs. The silver cations (Ag+) combine with the chloride anions (Cl-) to form an insoluble compound, while the potassium cations (K+) and nitrate anions (NO3-) remain soluble and do not contribute to the formation of a precipitate.

  • The reaction is an example of a double displacement reaction (also called a precipitation reaction).
  • The insoluble product formed is called the precipitate.
  • The solubility rules indicate that silver chloride (AgCl) is insoluble in water, which is why it precipitates out of the solution.

EXPLANATION:

  • The reaction between silver nitrate (AgNO3) and potassium chloride (KCl) is as follows:

AgNO3 (aq) + KCl (aq) → AgCl (s) + KNO3 (aq)

  • Silver chloride (AgCl) is the white precipitate that forms because it is insoluble in water.
  • Potassium nitrate (KNO3) remains dissolved in water as it is highly soluble.
  • The precipitation of AgCl can be visually observed as a white solid in the reaction mixture.

Therefore, the precipitate formed in this reaction is silver chloride (AgCl).

Question 114

Which of the following was a limitation of Mendeleev’s periodic table?

  1. AOption (a)

    It could not explain the position of isotopes correctly

  2. BOption (b)

    It could not explain the separation of metals and non-metals. 

  3. COption (c)

    It could not arrange elements into groups and periods. 

  4. DOption (d)

    It could not explain why properties repeated periodically

View answer & explanation

Correct answer

Answer: (a)A.

It could not explain the position of isotopes correctly

Why this answer is correct

CONCEPT:

Limitations of Mendeleev’s Periodic Table

  • Mendeleev’s periodic table was based on the atomic mass of elements.
  • While the table was revolutionary in organizing elements, it had certain limitations.
  • One of the major limitations was its inability to explain the position of isotopes.
  • Isotopes are atoms of the same element with different atomic masses but similar chemical properties.
  • Since Mendeleev’s table relied strictly on atomic mass for element placement, isotopes could not be accommodated correctly in his arrangement.

EXPLANATION:

  • Isotopes, such as Carbon-12 and Carbon-14, have different atomic masses but are chemically identical.
  • Mendeleev’s periodic table placed elements according to their atomic mass, but it failed to explain why isotopes of the same element were not differentiated or placed separately.
  • This limitation was addressed later with the discovery of atomic number as the fundamental property for organizing elements.
  • The modern periodic table, based on atomic number, resolved this issue and correctly accommodates isotopes in the same position as their parent element.

Therefore, the correct answer is It could not explain the position of isotopes correctly.

Question 115

What is the main active ingredient in bleaching powder?  

  1. AOption (a)

    Calcium bromide 

  2. BOption (b)

    Calcium iodide

  3. COption (c)

    Calcium hypochlorite 

  4. DOption (d)

    Calcium carbonate

View answer & explanation

Correct answer

Answer: (c)C.

Calcium hypochlorite 

Why this answer is correct

CONCEPT:

Bleaching Powder

  • Bleaching powder, also known as calcium hypochlorite, is a chemical compound widely used for disinfecting, bleaching, and water purification purposes.
  • Its main active ingredient is calcium hypochlorite (Ca(OCl)2), which releases chlorine upon decomposition.
  • This chlorine acts as a strong oxidizing agent, making bleaching powder effective for its intended applications.

EXPLANATION:

  • Calcium bromide (CaBr2): Used in drilling fluids.
  • Calcium iodide (CaI2): Used in photography and medicine.
  • Calcium carbonate (CaCO3): Found in limestone and used in cement production.
  • Only calcium hypochlorite (Ca(OCl)2) has properties that make it suitable for bleaching and disinfecting purposes.

Therefore, the correct answer is Calcium hypochlorite.

Question 116

Which of the following molecules has only single covalent bonds between all atoms?

  1. AOption (a)

    Carbon Dioxide

  2. BOption (b)

    Ethane 

  3. COption (c)

    Ethyne

  4. DOption (d)

     Ethene

View answer & explanation

Correct answer

Answer: (b)B.

Ethane 

Why this answer is correct

CONCEPT:

Covalent Bonds and Types

  • Covalent bonds are chemical bonds formed by the sharing of electron pairs between atoms.
  • A single covalent bond involves the sharing of one pair of electrons between two atoms.
  • Double and triple covalent bonds involve the sharing of two and three pairs of electrons, respectively.
  • Molecules with only single covalent bonds do not have double or triple bonds anywhere within their structure.

EXPLANATION:

  • Carbon Dioxide (CO2): The molecule has two double bonds (C=O), so it does not have only single bonds.

  • Ethane (C2H6): The molecule has only single covalent bonds between all atoms. It has no double or triple bonds.

  • Ethyne (C2H2): The molecule has a triple bond (C≡C), so it does not have only single bonds.

  • Ethene (C2H4): The molecule has a double bond (C=C), so it does not have only single bonds.

  • Thus, among the options, Ethane (C2H6) is the only molecule that has only single covalent bonds between all atoms.

Therefore, the correct answer is Ethane.

Question 117

Which of the following is NOT true about a homologous series? 

  1. AOption (a)

    Members differ by a –CH₂ group 

  2. BOption (b)

    They show identical physical properties

  3. COption (c)

    All members have the same general formula

  4. DOption (d)

    They have similar chemical properties

View answer & explanation

Correct answer

Answer: (b)B.

They show identical physical properties

Why this answer is correct

CONCEPT:

Homologous Series

  • A homologous series is a group of organic compounds that have the same functional group and follow a regular structural pattern.
  • Each successive member of the series differs by a –CH₂ group.
  • Compounds in a homologous series share the same general formula.
  • They exhibit similar chemical properties due to the presence of the same functional group.
  • However, their physical properties (such as boiling point, melting point, and density) show a gradual change as the molecular size and mass increase.

EXPLANATION:

  • "Members differ by a –CH₂ group" – This is true for homologous series as the addition of a –CH₂ group is a defining characteristic.
  • "They show identical physical properties" – This is NOT true. Physical properties such as boiling point, melting point, and density vary systematically with the increase in molecular size or mass in a homologous series.
  • "All members have the same general formula" – This is true. For example, alkanes follow the formula CnH2n+2.
  • "They have similar chemical properties" – This is true because all members of the homologous series have the same functional group, which governs their chemical behavior.

Therefore, the correct answer is  "They show identical physical properties."

Question 118

Which of the following is NOT a property that shows periodicity in the periodic table?

  1. AOption (a)

    Atomic radius  

  2. BOption (b)

    Electronegativity

  3. COption (c)

    Isotopes

  4. DOption (d)

    Ionization enthalpy 

View answer & explanation

Correct answer

Answer: (c)C.

Isotopes

Why this answer is correct

CONCEPT:

Periodicity in the Periodic Table

  • The periodic table is arranged in such a way that certain properties of elements repeat periodically as you move across a period or down a group.
  • These periodic properties include atomic radius, electronegativity, ionization enthalpy, electron affinity, etc.
  • However, isotopes are not a periodic property because they are variations of the same element with differing neutron numbers, and their presence does not follow a periodic trend.

EXPLANATION:

 

  • Atomic radius - This is a periodic property as it decreases across a period (due to increasing nuclear charge) and increases down a group (due to increasing energy levels).
  • Electronegativity - This is also a periodic property as it increases across a period and decreases down a group.
  • Isotopes - This is NOT a periodic property. Isotopes are different forms of the same element with the same number of protons but different numbers of neutrons, and they do not follow any periodic trend.
  • Ionization enthalpy - This is a periodic property as it increases across a period and decreases down a group.
  • From the above analysis, it is clear that isotopes do not exhibit periodicity in the periodic table.

Therefore, the correct answer is Isotopes.

Question 119

Metals DO NOT have which of the following properties?

  1. AOption (a)

    Conductor of electricity

  2. BOption (b)

    Malleability  

  3. COption (c)

    Insulating property

  4. DOption (d)

     Ductility

View answer & explanation

Correct answer

Answer: (c)C.

Insulating property

Why this answer is correct

CONCEPT:

Properties of Metals

  • Metals are materials that typically possess certain characteristic properties, such as conductivity, malleability, ductility, and lustrous appearance.
  • Key properties of metals include:
  • Conductivity: Metals are excellent conductors of electricity and heat due to the presence of free electrons that move easily.
  • Malleability: Metals can be hammered into thin sheets without breaking.
  • Ductility: Metals can be drawn into wires without losing their strength.
  • Lustrous appearance: Metals have a shiny surface that reflects light.
  • However, metals do NOT possess insulating properties because they are inherently designed to conduct electricity rather than resist it.

EXPLANATION:

  • Conductivity – Metals are good conductors of electricity.
  • Malleability – Metals are malleable and can be shaped into thin sheets.
  • Insulating property – Metals are NOT insulators; they conduct electricity instead.
  • Ductility – Metals are ductile and can be stretched into wires.

Thus, the correct answer is Insulating property.

Question 120

In ethane, C-C bond is _______. 

  1. AOption (a)

    ionic bond

  2. BOption (b)

    hydrogen bond

  3. COption (c)

    metallic bond

  4. DOption (d)

    covalent bond

View answer & explanation

Correct answer

Answer: (d)D.

covalent bond

Why this answer is correct

CONCEPT:

Covalent Bond

  • A covalent bond is a type of chemical bond where two atoms share pairs of electrons to achieve stability.
  • In covalent bonding, the shared electrons are usually located in the outermost electron shell of the atoms.
  • Covalent bonds typically occur between non-metallic elements with similar electronegativities.

EXPLANATION:

​

  • In ethane (C2H6), the two carbon atoms are connected by a single bond.
  • This bond is a covalent bond because each carbon atom shares one electron with the other carbon atom, forming a shared electron pair.
  • The covalent nature of the C-C bond ensures stability and contributes to the molecular structure of ethane.
  • Additionally, the hydrogen atoms in ethane are also bonded to the carbon atoms through covalent bonds.

Therefore, the C-C bond in ethane is a covalent bond.

Discipline 2 (20 questions)

Question 121

Which of the following statements is true about unicellular organisms?

  1. AOption (a)

    They are made up of multiple cells. 

  2. BOption (b)

    They can carry out all life processes within a single cell. 

  3. COption (c)

    They are always larger than multicellular organisms.

  4. DOption (d)

    They cannot reproduce.

View answer & explanation

Correct answer

Answer: (b)B.

They can carry out all life processes within a single cell. 

Why this answer is correct

CONCEPT:

Unicellular Organisms

  • Unicellular organisms consist of only one cell.
  • Despite being made up of a single cell, they can perform all life processes such as reproduction, metabolism, and respiration independently.
  • Examples of unicellular organisms include bacteria, protozoa, and some algae.

EXPLANATION:

  • Unicellular organisms are capable of performing all life processes like growth, reproduction, metabolism, and response to stimuli within their single cell.
  • Option 1 is incorrect because unicellular organisms are made up of only one cell, not multiple cells.
  • Option 3 is incorrect as unicellular organisms are generally smaller than multicellular organisms.
  • Option 4 is incorrect because unicellular organisms can reproduce, often through methods such as binary fission or budding.

Therefore, unicellular organisms are self-sufficient and capable of performing all life processes within a single cell, making option 2 the correct choice.

Question 122

What is the full form of UNEP?

  1. AOption (a)

    United Nation Environment Practice

  2. BOption (b)

    United Nation Engineering Programme

  3. COption (c)

    United Nations Environment Programme

  4. DOption (d)

    Union Nation Environment Protocol

View answer & explanation

Correct answer

Answer: (c)C.

United Nations Environment Programme

Why this answer is correct

CONCEPT:

United Nations Environment Programme (UNEP)

  • The United Nations Environment Programme (UNEP) is a global organization that coordinates environmental activities and assists countries in implementing environmentally sound policies and practices.
  • UNEP was established in 1972 as a result of the United Nations Conference on the Human Environment held in Stockholm, Sweden.
  • Its main focus areas include climate change, disaster and conflict, ecosystem management, environmental governance, harmful substances, and resource efficiency.

Therefore, the full form of UNEP is United Nations Environment Programme.

Question 123

What are the various ways in which cells can differ, concerning their shape? 

  1. AOption (a)

    Only circular 

  2. BOption (b)

    Disc-like, polygonal, cuboid and irregular

  3. COption (c)

    Only elongated 

  4. DOption (d)

    Only three-dimensional 

View answer & explanation

Correct answer

Answer: (b)B.

Disc-like, polygonal, cuboid and irregular

Why this answer is correct

CONCEPT:

Variation in Cell Shape

  • Cells can vary greatly in shape depending on their function and location in an organism.
  • Some cells are specialized and have unique shapes to perform specific roles, such as red blood cells or nerve cells.
  • Common cell shapes include circular, disc-like, polygonal, cuboid, and irregular forms.

EXPLANATION:

  • Cells are not limited to one shape; their shapes are highly diverse and are adapted to their specific functions in the body.
  • For example:
  • Disc-like: Red blood cells are disc-shaped, which helps them efficiently transport oxygen.
  • Polygonal: Some epithelial cells are polygonal for tight packing and protection.
  • Cuboid: Certain glandular cells have a cuboid shape for secretion.
  • Irregular: Nerve cells (neurons) have irregular shapes to aid in signal transmission.
  • It is incorrect to say that cells are only circular, elongated, or three-dimensional, as their shapes are more diverse and depend on their function.

Therefore, the correct answer is: Option 2 - Disc-like, polygonal, cuboid, and irregular.

Question 124

Which of the following statements is INCORRECT with regard to sex determination in humans? 

  1. AOption (a)

     Y chromosome from the father decides the gender of a girl child.

  2. BOption (b)

    Women have two X chromosomes; men have X and Y.

  3. COption (c)

    Sex is genetically determined in human beings.  

  4. DOption (d)

    All children get X chromosome from their mother. 

View answer & explanation

Correct answer

Answer: (a)A.

 Y chromosome from the father decides the gender of a girl child.

Why this answer is correct

CONCEPT:

Sex Determination in Humans

  • In humans, sex is genetically determined by the combination of sex chromosomes inherited from the parents.
  • Humans have 23 pairs of chromosomes, of which one pair is the sex chromosomes (X and Y).
  • Females have two X chromosomes (XX), while males have one X and one Y chromosome (XY).
  • The father's sperm carries either an X or a Y chromosome, while the mother's egg always carries an X chromosome.
  • The combination of the X chromosome from the mother and the Y chromosome from the father results in a male child (XY), while the combination of the X chromosome from both parents results in a female child (XX).

EXPLANATION:

  • The given statement is: "Y chromosome from the father decides the gender of a girl child."
  • This statement is incorrect because the Y chromosome from the father determines the male gender (XY) of the child, not the female gender.
  • All children inherit an X chromosome from their mother, and the gender is decided based on whether the father contributes an X chromosome (resulting in a girl, XX) or a Y chromosome (resulting in a boy, XY).

So, the correct answer is  Y chromosome from the father decides the gender of a girl child.

Question 125

What is the IUPAC name of baking soda?

  1. AOption (a)

    Sodium carbonate

  2. BOption (b)

    Sodium chloride 

  3. COption (c)

    Sodium hydrogen carbonate

  4. DOption (d)

    Sodium hydroxide

View answer & explanation

Correct answer

Answer: (c)C.

Sodium hydrogen carbonate

Why this answer is correct

CONCEPT:

IUPAC Naming of Baking Soda

  • Baking soda is commonly known as sodium bicarbonate.
  • The IUPAC name of baking soda is sodium hydrogen carbonate.
  • The chemical formula of baking soda is NaHCO3.

EXPLANATION:

  • Baking soda is a salt composed of sodium (Na+) and the bicarbonate ion (HCO3-).
  • The name "sodium hydrogen carbonate" comes from the presence of the hydrogen atom in the bicarbonate ion.
  • It is widely used in cooking, cleaning, and as an antacid due to its mild alkaline nature.

Therefore, the correct answer is Sodium hydrogen carbonate.

Question 126

Which of the following statements about cell number in organisms is correct?

  1. AOption (a)

    All organisms are unicellular.  

  2. BOption (b)

    Organisms can be classified as unicellular or multicellular based on the number of cells they contain. 

  3. COption (c)

    Multicellular organisms are composed of just one type of cell.

  4. DOption (d)

    Cell number has no significance in the classification of organisms.

View answer & explanation

Correct answer

Answer: (b)B.

Organisms can be classified as unicellular or multicellular based on the number of cells they contain. 

Why this answer is correct

CONCEPT:

Cell Number in Organisms

  • Organisms can be classified as unicellular or multicellular based on the number of cells they contain.
  • Unicellular organisms are made up of a single cell that performs all life processes, such as bacteria and amoeba.
  • Multicellular organisms are composed of many cells that may be specialized to perform specific functions, such as plants, animals, and humans.
  • The number of cells in an organism is significant in determining its classification.

EXPLANATION:

  • "All organisms are unicellular" is incorrect because many organisms, such as humans and plants, are multicellular.
  • "Organisms can be classified as unicellular or multicellular based on the number of cells they contain" is correct, as it accurately reflects the basis for classification.
  • "Multicellular organisms are composed of just one type of cell" is incorrect because multicellular organisms have different types of specialized cells.
  • "Cell number has no significance in the classification of organisms" is incorrect because cell number is a primary factor in determining whether an organism is unicellular or multicellular.

Therefore, the correct answer is Organisms can be classified as unicellular or multicellular based on the number of cells they contain.

Question 127

Which of the following parts of a flower contain germ cells? 

  1. AOption (a)

    Petals and pistil  

  2. BOption (b)

     Sepal and petals

  3. COption (c)

    Stamen and pistil

  4. DOption (d)

     Petals and stamen 

View answer & explanation

Correct answer

Answer: (c)C.

Stamen and pistil

Why this answer is correct

CONCEPT:

Germ Cells in Flowers

  • In a flower, reproductive cells or germ cells are involved in the process of sexual reproduction.
  • The two main reproductive parts of a flower are the stamen (male reproductive organ) and the pistil (female reproductive organ).
  • The stamen contains pollen grains, which are the male germ cells, while the pistil contains ovules, which are the female germ cells.

EXPLANATION:

  • The parts of the flower mentioned in the options can be analyzed as follows:
  • Petals and pistil - Petals are not involved in reproduction; they attract pollinators. Only the pistil contains germ cells.
  • Sepal and petals - Neither sepals nor petals contain germ cells; they serve as protective structures or attract pollinators.
  • Stamen and pistil - Both stamen and pistil are reproductive parts of the flower. The stamen produces male germ cells (pollen), and the pistil houses female germ cells (ovules).
  • Petals and stamen - Petals do not contain germ cells, though the stamen does.

​Therefore, the correct answer is Stamen and pistil.

Question 128

Double fertilisation is characteristic of which group of plants?

  1. AOption (a)

    Gymnosperms

  2. BOption (b)

    Angiosperms 

  3. COption (c)

    Bryophytes 

  4. DOption (d)

    Pteridophytes 

View answer & explanation

Correct answer

Answer: (b)B.

Angiosperms 

Why this answer is correct

CONCEPT:

Double Fertilisation

  • Double fertilisation is a unique characteristic of angiosperms (flowering plants).
  • It involves the fertilisation of two different cells in the ovule by two sperm cells delivered by the pollen tube:
  • One sperm cell fertilises the egg cell to form a diploid zygote.
  • The other sperm cell fuses with two polar nuclei to form a triploid endosperm, which serves as the nutritive tissue for the developing embryo.
  • This process is essential for the formation of seeds and is a defining feature of angiosperms.

EXPLANATION:

  • Double fertilisation does not occur in other groups of plants like gymnosperms, bryophytes, or pteridophytes.
  • In gymnosperms, fertilisation involves a single fusion event, and they do not have endosperm formation like angiosperms.
  • Bryophytes and pteridophytes do not produce seeds and have different reproductive mechanisms involving motile sperm cells and water for fertilisation.
  • Hence, the characteristic feature of double fertilisation is exclusive to angiosperms.

Therefore, the correct answer is: Angiosperms.

Question 129

Which of the following statements is NOT an objective of conservation and management of natural resources for sustainable development? 

  1. AOption (a)

    Safe disposable of wastes in the environment.

  2. BOption (b)

    To reduce the damage done to the environment.

  3. COption (c)

    Natural resource management needs a long-term view.

  4. DOption (d)

    Management should benefit only the rich and powerful.

View answer & explanation

Correct answer

Answer: (d)D.

Management should benefit only the rich and powerful.

Why this answer is correct

CONCEPT:

Conservation and Management of Natural Resources

  • The conservation and sustainable management of natural resources are aimed at ensuring their availability for present and future generations.
  • It involves practices such as reducing waste, minimizing damage to the environment, and taking a long-term view of resource usage.
  • Sustainable development ensures that the benefits of resource management are distributed equitably across society.

EXPLANATION:

  • The objective of conservation and management of natural resources is to ensure the health and sustainability of the environment while benefiting society as a whole.
  • "Safe disposable of wastes in the environment" aligns with the goal of reducing pollution and preserving the environment.
  • "To reduce the damage done to the environment" is a key aspect of sustainable resource management.
  • "Natural resource management needs a long-term view" emphasizes the importance of planning for future generations.
  • "Management should benefit only the rich and powerful" contradicts the fundamental principle of equitable resource distribution, making this the incorrect statement.

So, the correct answer is Management should benefit only the rich and powerful.

Question 130

What is the atomic mass of the middle element in the triad of calcium (Ca), strontium (Sr) and barium (Ba)?

  1. AOption (a)

    108

  2. BOption (b)

    52

  3. COption (c)

    88

  4. DOption (d)

    56

View answer & explanation

Correct answer

Answer: (c)C.

88

Why this answer is correct

CONCEPT:

Law of Triads

  • The Law of Triads, proposed by Johann Wolfgang Döbereiner, states that in a group of three elements (called a triad) with similar chemical properties, the atomic mass of the middle element is approximately the average of the atomic masses of the other two elements.
  • The triad used in this question consists of calcium (Ca), strontium (Sr), and barium (Ba).

EXPLANATION:

  • Given the atomic masses:
  • Atomic mass of calcium (Ca) = 40
  • Atomic mass of barium (Ba) = 137
  • To find the atomic mass of the middle element (strontium, Sr):
  • According to the law of triads: Atomic mass of Sr ≈ (Atomic mass of Ca + Atomic mass of Ba) ÷ 2
  • Atomic mass of Sr ≈ (40 + 137) ÷ 2
  • Atomic mass of Sr ≈ 177 ÷ 2
  • Atomic mass of Sr ≈ 88

Therefore, the atomic mass of the middle element (strontium, Sr) is 88.

Question 131

Which of the following statements is INCORRECT about reproductive health?

  1. AOption (a)

    It does not cover maternal and infant health.

  2. BOption (b)

    It prevents transmission of bacterial and viral infections.

  3. COption (c)

    It includes safe childbirth

  4. DOption (d)

     It affects the mental well-being of a person. 

View answer & explanation

Correct answer

Answer: (a)A.

It does not cover maternal and infant health.

Why this answer is correct

CONCEPT:

Reproductive Health

  • Reproductive health refers to a state of complete physical, mental, and social well-being in all matters relating to the reproductive system.
  • It includes maternal health, infant health, family planning, and the prevention of sexually transmitted infections (STIs).
  • It also emphasizes the importance of safe childbirth and access to healthcare services to ensure the well-being of both mother and child.
  • Mental well-being is an integral part of reproductive health, as emotional and psychological health are closely tied to reproductive processes.

EXPLANATION:

  • Option 1 states, "It does not cover maternal and infant health," which is incorrect.
  • Maternal and infant health is a vital component of reproductive health. It ensures safe pregnancy, childbirth, and the well-being of the newborn.
  • Reproductive health also involves measures to prevent transmission of bacterial and viral infections (Option 2), safe childbirth practices (Option 3), and mental well-being (Option 4).
  • The incorrect statement is Option 1 because reproductive health indeed covers maternal and infant health.

Therefore, the correct answer is It does not cover maternal and infant health.

Question 132

Read the given statements of Assertion (A) and Reason (R) carefully and select the correct option.

Assertion (A): Pollination is essential for the formation of seeds in flowering plants.

Reason (R): Pollination ensures the transfer of pollen grains from the anther to the stigma.

  1. AOption (a)

    (A) is false, but (R) is true.

  2. BOption (b)

    (A) is true, but (R) is false. 

  3. COption (c)

     Both (A) and (R) are true, but (R) is not the correct explanation of (A).

  4. DOption (d)

    Both (A) and (R) are true, and (R) is the correct explanation of (A).

View answer & explanation

Correct answer

Answer: (d)D.

Both (A) and (R) are true, and (R) is the correct explanation of (A).

Why this answer is correct

CONCEPT:

Pollination in Flowering Plants

  • Pollination is the process of transfer of pollen grains from the anther (male part) of a flower to the stigma (female part).
  • It is an essential step for fertilization, which leads to the formation of seeds in flowering plants.
  • Pollination can occur in different ways, such as self-pollination (within the same flower) or cross-pollination (between different flowers).

EXPLANATION:

  • The given assertion (A) states: "Pollination is essential for the formation of seeds in flowering plants."
  • The reason (R) provided states: "Pollination ensures the transfer of pollen grains from the anther to the stigma."
  • Both (A) and (R) are true because:
  • For seeds to form, fertilization must occur, which requires the transfer of pollen grains to the stigma.
  • Pollination facilitates this transfer, making fertilization possible.
  • Additionally, (R) directly explains why (A) is true, as pollination is the mechanism that ensures the transfer of pollen grains.

Therefore, the correct answer is "Both (A) and (R) are true, and (R) is the correct explanation of (A)."

Question 133

Which of the following materials is considered biodegradable? 

  1. AOption (a)

    Styrofoam containers 

  2. BOption (b)

    Paper   

  3. COption (c)

    Glass bottles

  4. DOption (d)

    Plastic bags

View answer & explanation

Correct answer

Answer: (b)B.

Paper   

Why this answer is correct

CONCEPT:

Biodegradable Materials

  • Biodegradable materials are those that can be decomposed by natural processes, typically by microorganisms such as bacteria or fungi.
  • These materials break down into natural substances like water, carbon dioxide, and biomass, which are harmless to the environment.
  • Examples of biodegradable materials include paper, food waste, and certain types of natural fibers.

EXPLANATION:

  • Styrofoam containers are made of polystyrene, a non-biodegradable material.
  • Paper is made from plant fibers and can be easily decomposed by microorganisms, making it biodegradable.
  • Glass bottles are non-biodegradable because they do not decompose in the environment naturally.
  • Plastic bags are made from synthetic polymers, which are also non-biodegradable.
  • Among the options, only paper (Option 2) is a biodegradable material.

Therefore, the correct answer is Paper.

Question 134

Which forest officer started reviving the degraded Sal forests in Arabari, Midnapore, in 1972? 

  1. AOption (a)

    Amrita Devi Bishnoi 

  2. BOption (b)

    Robin Warren 

  3. COption (c)

    AK Banerjee 

  4. DOption (d)

    Barry Marshall

View answer & explanation

Correct answer

Answer: (c)C.

AK Banerjee 

Why this answer is correct

CONCEPT:

Joint Forest Management (JFM) and Forest Revival

  • Joint Forest Management (JFM) is a strategy initiated to involve local communities in the protection and management of forests.
  • The concept was pioneered in India during the 1970s, specifically focusing on degraded forest lands to promote sustainable development and ecological balance.
  • Arabari, located in Midnapore, West Bengal, was the site where this initiative gained prominence under the leadership of a forest officer.

EXPLANATION:

  • In 1972, A.K. Banerjee, a dedicated forest officer, began reviving the degraded Sal forests in Arabari, Midnapore.
  • He implemented the Joint Forest Management strategy, involving local villagers in the conservation and management of forests.
  • This approach encouraged locals to take ownership of the forests, providing them with benefits such as fuelwood, fodder, and non-timber forest products in return for their efforts in protecting the area.
  • The initiative led to the successful restoration of the Sal forests, transforming them into thriving ecosystems while improving the livelihoods of the local communities.

Therefore, the correct answer is A.K. Banerjee, who pioneered the revival of degraded Sal forests in Arabari, Midnapore, through the Joint Forest Management model.

Question 135

Which of the following is an example of incomplete dominance?

  1. AOption (a)

    Colour blindness 

  2. BOption (b)

    Blood types A, B, AB and O

  3. COption (c)

    Red and white flowers producing pink flowers 

  4. DOption (d)

    Tall and short pea plants

View answer & explanation

Correct answer

Answer: (c)C.

Red and white flowers producing pink flowers 

Why this answer is correct

CONCEPT:

Incomplete Dominance

  • Incomplete dominance is a form of inheritance where neither allele is completely dominant over the other.
  • As a result, the phenotype of the heterozygote is an intermediate or blend of the two parental phenotypes.
  • This phenomenon occurs when both alleles are expressed partially, leading to a mixture of traits.

EXPLANATION:

  • Colour blindness is an example of sex-linked inheritance, not incomplete dominance.
  • Blood types A, B, AB, and O are an example of codominance and multiple alleles.
  • Red and white flowers producing pink flowers is a classic example of incomplete dominance, where the heterozygous genotype (Rr) produces an intermediate phenotype (pink).
  • Tall and short pea plants refer to Mendelian inheritance with complete dominance, not incomplete dominance.
  • Therefore, the correct answer is Red and white flowers producing pink flowers.

Thus, incomplete dominance is best illustrated by the blending of traits, as seen in red and white flowers producing pink flowers.

Question 136

Why is composting beneficial for biodegradable materials?

  1. AOption (a)

    It transforms waste into nutrient-rich soil.

  2. BOption (b)

    It allows for waste to be dumped in landfills.

  3. COption (c)

    It makes biodegradable materials non-biodegradable. 

  4. DOption (d)

     It destroys nutrients in the materials. 

View answer & explanation

Correct answer

Answer: (a)A.

It transforms waste into nutrient-rich soil.

Why this answer is correct

CONCEPT:

Composting

  • Composting is the process of recycling organic waste into nutrient-rich soil or humus.
  • It relies on microorganisms, such as bacteria and fungi, to decompose biodegradable materials like food scraps, yard waste, and paper.
  • The end product of composting is a dark, crumbly substance called compost, which can be used to enrich soil and promote plant growth.

EXPLANATION:

  • Composting is beneficial for biodegradable materials because:
  • It transforms waste into nutrient-rich soil, which can be used in gardening, farming, and landscaping.
  • It reduces the volume of waste sent to landfills, thereby minimizing environmental pollution and methane production.
  • It helps retain nutrients in the materials, making them available for reuse in the ecosystem.
  • Option 1 is correct because composting facilitates the conversion of organic waste into a valuable resource for soil enhancement.

​Therefore, the correct answer is It transforms waste into nutrient-rich soil.

Question 137

Which atmospheric pollutant is primarily responsible for the thinning of the stratospheric ozone layer? 

  1. AOption (a)

    Chlorofluorocarbons

  2. BOption (b)

    Methane

  3. COption (c)

    Sulphur dioxide 

  4. DOption (d)

    Carbon monoxide 

View answer & explanation

Correct answer

Answer: (a)A.

Chlorofluorocarbons

Why this answer is correct

CONCEPT:

Thinning of the Stratospheric Ozone Layer

  • The stratospheric ozone layer is crucial for protecting life on Earth by absorbing harmful ultraviolet (UV) radiation from the Sun.
  • Chlorofluorocarbons (CFCs) are synthetic compounds widely used in refrigeration, air conditioning, aerosol propellants, and foam-blowing applications.
  • CFCs are highly stable in the lower atmosphere but release chlorine atoms when they reach the stratosphere, due to UV radiation.

EXPLANATION:

  • When CFCs are exposed to UV radiation in the stratosphere:
  • CFC molecules break down, releasing chlorine atoms (Cl).
  • These chlorine atoms act as catalysts, breaking down ozone (O3) into oxygen (O2), leading to ozone depletion.
  • A single chlorine atom can destroy thousands of ozone molecules before being deactivated.
  • Other pollutants like methane, sulfur dioxide, and carbon monoxide do not have the same destructive impact on the ozone layer as CFCs.

Cl + O3 → ClO + O2

ClO + O → Cl + O2

Therefore, the primary atmospheric pollutant responsible for the thinning of the stratospheric ozone layer is chlorofluorocarbons.

Question 138

Which type of cell is typically long and has a thread-like shape to help it perform its function efficiently? 

  1. AOption (a)

    Nerve cell 

  2. BOption (b)

    Fat cells

  3. COption (c)

    RBC

  4. DOption (d)

     Skin

View answer & explanation

Correct answer

Answer: (a)A.

Nerve cell 

Why this answer is correct

CONCEPT:

Structure and Function of Cells

  • Cells have specific shapes and structures that enable them to perform their functions efficiently.
  • Nerve cells (neurons) are typically long and thread-like, which allows them to transmit signals over long distances in the body.
  • The elongated shape of nerve cells is crucial for their role in communication within the nervous system.

EXPLANATION:

  • Nerve cells: They are specialized for transmitting electrical impulses. Their long, thread-like structure helps carry signals efficiently over large distances.
  • Fat cells: These are round and store energy in the form of fat. Their shape is suited for efficient energy storage, not for transmitting signals.
  • Red Blood Cells (RBCs): They are biconcave in shape, which helps them transport oxygen efficiently through the bloodstream.
  • Skin cells: These are typically flat and layered to provide a protective barrier.

​Therefore, the type of cell that is typically long and thread-like to help it perform its function efficiently is the nerve cell.

Question 139

What is the primary significance of variation in plants?

  1. AOption (a)

     It ensures uniformity across plant populations. 

  2. BOption (b)

     It decreases resilience to diseases.  

  3. COption (c)

    It enables adaptation to changing environmental conditions. 

  4. DOption (d)

    It limits genetic diversity

View answer & explanation

Correct answer

Answer: (c)C.

It enables adaptation to changing environmental conditions. 

Why this answer is correct

CONCEPT:

Variation in Plants

  • Variation in plants refers to the genetic and phenotypic differences among individuals within a plant population.
  • These variations arise due to genetic mutations, genetic recombination during reproduction, and environmental influences.
  • Such diversity is essential for the survival and evolution of plant species over time.

EXPLANATION:

  • The primary significance of variation in plants lies in their ability to adapt to changing environmental conditions.
  • When environmental conditions change, such as shifts in climate, availability of water, or the presence of diseases, variations allow certain individuals in the population to survive and reproduce.
  • This ensures the continuation of the species and increases their resilience to adverse conditions.

Additional Information

  • Uniformity across plant populations (Option 1) reduces the ability to adapt and survive under changing conditions.
  • Decreased resilience to diseases (Option 2) is not a benefit but a drawback of reduced variation.
  • Limiting genetic diversity (Option 4) negatively impacts adaptability.

Therefore, the correct answer is It enables adaptation to changing environmental conditions.

Question 140

In fragmentation, which part of the plant typically develops into a new individual? 

  1. AOption (a)

    Fruits

  2. BOption (b)

    Seeds

  3. COption (c)

    Fragments of any vegetative part

  4. DOption (d)

    Flowers

View answer & explanation

Correct answer

Answer: (c)C.

Fragments of any vegetative part

Why this answer is correct

CONCEPT:

Fragmentation in Plants

  • Fragmentation is a type of asexual reproduction in which a new individual develops from a fragment of the parent organism.
  • This process is common in some plants and algae, where parts of the vegetative body (such as stems, leaves, or rhizomes) break off and grow into a new organism under suitable conditions.
  • It does not involve the formation of seeds, fruits, or flowers.

EXPLANATION:

  • In the process of fragmentation, any vegetative part of the plant, such as a stem, root, or leaf, can develop into a new individual when separated from the parent plant.
  • This is because these vegetative parts have meristematic tissues, which allow them to grow and develop into a full plant.
  • Examples of plants that use fragmentation include algae like Spirogyra and certain grasses.

Therefore, the correct answer is Fragments of any vegetative part.

Discipline 3 (20 questions)

Question 141

An object is placed 50 cm away from a convex lens with a focal length of 30 cm. What is the image distance?

  1. AOption (a)

    18.75 cm

  2. BOption (b)

    25 cm

  3. COption (c)

    75 cm

  4. DOption (d)

    −22.50 cm

View answer & explanation

Correct answer

Answer: (c)C.

75 cm

Why this answer is correct

CONCEPT:

Lens Formula

  • The lens formula is given by:

1/f = 1/v - 1/u

where:

  • f is the focal length of the lens (in cm)
  • v is the image distance (in cm)
  • u is the object distance (in cm)
  • For a convex lens, the focal length (f) is positive, and the object distance (u) is negative when the object is placed on the left side of the lens.

EXPLANATION:

  • Given:
  • Focal length of the lens, f = 30 cm
  • Object distance, u = -50 cm
  • Using the lens formula:

1/f = 1/v - 1/u

1/30 = 1/v - 1/(-50)

1/30 = 1/v + 1/50

  • Solving for 1/v:

1/v = 1/30 - 1/50

1/v = (50 - 30) / (30 × 50)

1/v = 20 / 1500

1/v = 1/75

  • Therefore, v = 75 cm.

The image distance is 75 cm.

Question 142

In a circuit, a resistor of resistance R1 = 6 Ω is connected in series with another resistor R2 . The voltage across the combination is 24 V, and the total current through the circuit is 2 A. If the voltage drop across R1 is 12 V, what is the resistance of R2?

  1. AOption (a)

    6 ohms 

  2. BOption (b)

    4 ohms

  3. COption (c)

    3 ohms

  4. DOption (d)

     12 ohms

View answer & explanation

Correct answer

Answer: (a)A.

6 ohms 

Why this answer is correct

CONCEPT:

Ohm's Law and Series Resistance

  • Ohm's Law states that the voltage (V) across a resistor is proportional to the current (I) flowing through it and its resistance (R):

V = I × R

  • For resistors connected in series, the total resistance (Rtotal) is the sum of the individual resistances:

Rtotal = R1 + R2

  • The total voltage across the series combination is equal to the sum of the voltage drops across the individual resistors.

Vtotal = V1 + V2

EXPLANATION:

  • Given:
  • R1 = 6 Ω
  • Total Voltage (Vtotal) = 24 V
  • Total Current (I) = 2 A
  • Voltage across R1 (V1) = 12 V
  • Using Ohm's Law:
  • V1 = I × R1
  • 12 V = 2 A × 6 Ω (this confirms the voltage drop across R1)
  • Voltage across R2:
  • V2 = Vtotal - V1
  • V2 = 24 V - 12 V = 12 V
  • Using Ohm's Law for R2:
  • R2 = V2 / I
  • R2 = 12 V / 2 A = 6 Ω

Therefore, the resistance of R2 is 6 Ω.

Question 143

Which of the following pairs correctly matches a scalar and a vector quantity, respectively?

  1. AOption (a)

    Work – Speed

  2. BOption (b)

     Force – Mass

  3. COption (c)

     Distance – Displacement

  4. DOption (d)

    Energy – Distance

View answer & explanation

Correct answer

Answer: (c)C.

 Distance – Displacement

Why this answer is correct

CONCEPT:

Scalar and Vector Quantities

  • A scalar quantity has only magnitude and no direction. Examples include work, energy, distance, speed, etc.
  • A vector quantity has both magnitude and direction. Examples include force, displacement, velocity, etc.

EXPLANATION:

  • Work – Speed
  • Work is a scalar quantity as it has only magnitude and no direction.
  • Speed is also a scalar quantity, so this pair does not match the requirement of a scalar and vector.
  • Force – Mass
  • Force is a vector quantity as it has both magnitude and direction.
  • Mass is a scalar quantity, so this pair does not satisfy the order of scalar and vector.
  • Distance – Displacement
  • Distance is a scalar quantity as it has only magnitude and no direction.
  • Displacement is a vector quantity as it has both magnitude and direction.
  • This pair correctly matches the scalar and vector quantities.
  • Energy – Distance
  • Energy is a scalar quantity.
  • Distance is also a scalar quantity, so this pair does not match the requirement of a scalar and vector.

Therefore, the correct answer is Distance – Displacement.

Question 144

A person walks 5 m north, 3 m east, and 5 m south. The displacement length of the person is _________.

  1. AOption (a)

    8 m

  2. BOption (b)

    10 m

  3. COption (c)

    13 m

  4. DOption (d)

    3 m 

View answer & explanation

Correct answer

Answer: (d)D.

3 m 

Why this answer is correct

CONCEPT:

Displacement

  • Displacement is the shortest distance between the initial and final positions of a moving object, considering the direction.
  • It is a vector quantity and can be calculated using the Pythagorean theorem when the movement involves perpendicular directions.

EXPLANATION:

  • The person walks as follows:
  • 5 m north
  • 3 m east
  • 5 m south
  • Net displacement along the north-south direction:
  • 5 m north - 5 m south = 0 m
  • Net displacement along the east direction:
  • 3 m east
  • Since the displacement along the north-south direction is 0 m and the displacement along the east direction is 3 m, the total displacement is the absolute value of the east direction movement.

Therefore, the displacement length of the person is 3 m.

Question 145

For a concave mirror, if a ray passes through the principal focus and then strikes the mirror, it will: 

  1. AOption (a)

    retrace its path 

  2. BOption (b)

    pass through the centre of curvature

  3. COption (c)

    reflect back through the pole

  4. DOption (d)

    reflect parallel to the principal axis

View answer & explanation

Correct answer

Answer: (d)D.

reflect parallel to the principal axis

Why this answer is correct

CONCEPT:

Reflection of Light in a Concave Mirror

  • A concave mirror is a curved mirror where the reflecting surface bulges inward.
  • When a ray of light passes through the principal focus of a concave mirror and strikes the mirror, it reflects in a specific direction.
  • The behavior of the reflected ray is governed by the laws of reflection and the geometry of the mirror.
  • If a ray passes through the principal focus, it reflects parallel to the principal axis after striking the mirror.

EXPLANATION:

  • Given that the ray passes through the principal focus of the concave mirror:
  • The principal focus is a point on the principal axis where parallel rays converge (for a concave mirror).
  • When a ray passes through the principal focus, it hits the mirror at an angle.
  • According to the reflection rule of a concave mirror, any ray passing through the principal focus will reflect parallel to the principal axis.
  • Thus, the correct behavior of the reflected ray is that it reflects parallel to the principal axis.

Therefore, the correct answer is The ray reflects parallel to the principal axis.

Question 146

The pressure flow hypothesis explains the movement of:

  1. AOption (a)

    oxygen in stomata 

  2. BOption (b)

    water from roots to leaves

  3. COption (c)

    sugars in phloem

  4. DOption (d)

    nutrients in soil 

View answer & explanation

Correct answer

Answer: (c)C.

sugars in phloem

Why this answer is correct

CONCEPT:

Pressure Flow Hypothesis

  • The pressure flow hypothesis explains the movement of sugars (primarily sucrose) in the phloem of plants.
  • It is based on the principle of pressure differences between the source (where sugars are synthesized, such as leaves) and the sink (where sugars are utilized or stored, such as roots, fruits, or seeds).
  • This process involves the active transport of sucrose into the phloem, which causes water to enter due to osmosis, creating a high pressure in the phloem at the source. At the sink, sucrose is removed, lowering the pressure and causing the flow of materials from source to sink.

EXPLANATION:

  • The pressure flow hypothesis specifically describes the movement of sugars within the phloem of plants.
  • It does not explain the movement of oxygen in stomata, water from roots to leaves, or nutrients in soil. These processes are explained by different mechanisms, such as diffusion, transpiration pull, and nutrient uptake, respectively.

​Thus, the pressure flow hypothesis explains the movement of sugars in the phloem.

Question 147

When an object is placed between the focal point and the mirror in a concave mirror, the image formed is ______.

  1. AOption (a)

    real and erect 

  2. BOption (b)

    virtual and erect

  3. COption (c)

    real and inverted

  4. DOption (d)

    virtual and inverted 

View answer & explanation

Correct answer

Answer: (b)B.

virtual and erect

Why this answer is correct

Here is the answer in the requested format with the concept and explanation for the given question:

CONCEPT:

Image Formation by Concave Mirrors

  • A concave mirror is a spherical mirror that curves inward, like the inside of a bowl.
  • The nature of the image formed by a concave mirror depends on the position of the object relative to the mirror's focal point (F) and the center of curvature (C).
  • When an object is placed between the focal point and the mirror, the reflected rays diverge, and the image formed is virtual, erect, and magnified.
  • This happens because the reflected rays appear to meet when extended backward, forming the virtual image on the same side of the mirror as the object.

EXPLANATION:

  • For an object placed between the focal point (F) and the mirror:
  • The reflected rays appear to diverge.
  • When these diverging rays are extended backward, they meet at a point behind the mirror.
  • This forms a virtual image that is upright (erect) and magnified.
  • Virtual images cannot be projected on a screen, as the rays do not actually converge but only appear to do so.

Therefore, when an object is placed between the focal point and the mirror in a concave mirror, the image formed is virtual and erect.

Question 148

An object is placed at the centre of curvature of a concave mirror, forming a real image at the centre of curvature. If the object is moved slightly closer to the focal point, such that it still remains between the centre of curvature and the focus, which of the following will correctly describe the change in the image? 

  1. AOption (a)

    The image will move closer to the focus, will remain real, and will be smaller than the object.

  2. BOption (b)

    The image will move closer to the mirror, will become virtual, and will be smaller than the object.

  3. COption (c)

    The image will move beyond the centre of curvature, will remain real, and will be larger than the object. 

  4. DOption (d)

    The image will move closer to the focus, will become virtual, and will be larger than the object. 

View answer & explanation

Correct answer

Answer: (c)C.

The image will move beyond the centre of curvature, will remain real, and will be larger than the object. 

Why this answer is correct

CONCEPT:

Image Formation by Concave Mirror

  • A concave mirror forms real and inverted images when the object is placed beyond the focal point.
  • The position of the object determines the nature, size, and position of the image:
  • When the object is at the center of curvature, the image is formed at the center of curvature, is real, inverted, and of the same size as the object.
  • When the object is moved closer to the focal point (but still between the center of curvature and the focus), the image moves beyond the center of curvature, becomes larger, remains real, and is inverted.

EXPLANATION:

  • When the object moves closer to the focal point (but still between the center of curvature and the focus):
  • According to the mirror formula (1/f = 1/v - 1/u, where f is the focal length, v is the image distance, and u is the object distance), the image distance (v) increases as the object distance (u) decreases.
  • The image moves beyond the center of curvature.
  • The magnification (M = -v/u) increases, so the image becomes larger than the object.
  • The image remains real and inverted because the object is still outside the focal point.
  • Thus, the correct answer is Option 3: "The image will move beyond the center of curvature, will remain real, and will be larger than the object."

Therefore, when the object is moved closer to the focal point but remains between the center of curvature and the focus, the image will move beyond the center of curvature, remain real, and become larger than the object.

Question 149

The image produced by a convex lens is:

  1. AOption (a)

     dependent on the initial position of the object

  2. BOption (b)

    always inverted and enlarged

  3. COption (c)

    always erect and diminished

  4. DOption (d)

    always erect and enlarged

View answer & explanation

Correct answer

Answer: (a)A.

 dependent on the initial position of the object

Why this answer is correct

CONCEPT:

Image Formation by a Convex Lens

  • A convex lens is also known as a converging lens because it bends light rays inward to meet at a point (focus).
  • The nature and position of the image formed by a convex lens depend on the position of the object relative to the lens and its focal point.
  • The image can be real or virtual, inverted or erect, and magnified or diminished based on the object's position.

EXPLANATION:

  • The image formed by a convex lens is dependent on the initial position of the object. The following cases can occur:
  • If the object is placed beyond the 2F point (twice the focal length), the image is real, inverted, and diminished.
  • If the object is placed at the 2F point, the image is real, inverted, and of the same size as the object.
  • If the object is placed between the 2F point and the F point (focal length), the image is real, inverted, and magnified.
  • If the object is placed at the F point, no image is formed as the rays converge at infinity.
  • If the object is placed between the F point and the lens, the image is virtual, erect, and magnified.
  • Thus, the nature of the image depends on the initial position of the object relative to the convex lens.

Therefore, the correct answer is Dependent on the initial position of the object.

Question 150

What is the distance between the pole and the centre of curvature of a spherical mirror called? 

  1. AOption (a)

    Focal length

  2. BOption (b)

    Radius of curvature 

  3. COption (c)

     Principal axis 

  4. DOption (d)

    Image distance

View answer & explanation

Correct answer

Answer: (b)B.

Radius of curvature 

Why this answer is correct

CONCEPT:

Radius of Curvature

  • The distance between the pole (P) and the center of curvature (C) of a spherical mirror is called the radius of curvature.
  • The center of curvature (C) is the center of the sphere of which the mirror forms a part.
  • The pole (P) is the midpoint of the reflecting surface of the mirror.
  • The radius of curvature is denoted by the symbol R.

EXPLANATION:

  • In the case of a spherical mirror:
  • The spherical mirror is a part of a sphere.
  • The center of the sphere is called the center of curvature (C).
  • The distance from the pole (P) to the center of curvature (C) is called the radius of curvature (R).
  • This is different from the focal length (f), which is the distance from the pole (P) to the focus (F).
  • For a spherical mirror, the relationship between the radius of curvature (R) and the focal length (f) is:

R = 2f

Correct Answer: The distance between the pole and the center of curvature of a spherical mirror is called the radius of curvature.

Question 151

In which part of the plant does the process of excretion primarily occur?

  1. AOption (a)

    Flowers

  2. BOption (b)

    Branches

  3. COption (c)

    Roots

  4. DOption (d)

    Leaves

View answer & explanation

Correct answer

Answer: (d)D.

Leaves

Why this answer is correct

CONCEPT:

Plant Excretion

  • Excretion in plants primarily occurs through specialized structures called stomata found on leaves.
  • Excess water, gases, and metabolic wastes are released through stomata during processes like transpiration and respiration.
  • The leaves also help in the disposal of waste products by accumulating them in old or dying leaves, which are eventually shed.

EXPLANATION:

  • The process of excretion in plants is mainly carried out by the leaves. Here's why:
  • Leaves contain stomata, which are microscopic openings on their surface that facilitate the removal of excess gases like oxygen and carbon dioxide.
  • Through transpiration, water vapor is released from the leaves, helping in the disposal of excess water.
  • Waste products like tannins, alkaloids, and other secondary metabolites are stored in leaves and eliminated when the leaves fall off the plant.

Therefore, the correct answer is Leaves.

Question 152

If four identical bulbs of rating 100 watts - 220 volts each are connected in series to a 220 volt supply, then the total power drawn by them (in watts) will be:

  1. AOption (a)

    400 

  2. BOption (b)

    100

  3. COption (c)

    0.04 

  4. DOption (d)

    25

View answer & explanation

Correct answer

Answer: (d)D.

25

Why this answer is correct

CONCEPT:

Power Dissipation in Series Circuit

  • When resistances (or bulbs, which act as resistors) are connected in series, the total resistance of the circuit is the sum of the individual resistances.
  • The voltage across the entire circuit is distributed across each resistor according to its resistance.
  • The power dissipated in the circuit is given by the formula:

P = V2/R

where V is the total voltage across the circuit and R is the total resistance of the circuit.

EXPLANATION:

  • Each bulb has a resistance Rbulb, which can be calculated using the formula:

Rbulb = V2/P

where V = 220 V and P = 100 W.

  • Substituting the values:

Rbulb = (220)2/100 = 484 Ω

  • Since the bulbs are connected in series, the total resistance of the circuit is:

Rtotal = 4 × Rbulb = 4 × 484 = 1936 Ω

  • The total voltage supplied to the circuit is 220 V. Using the formula for power dissipation in the circuit:

P = V2/Rtotal

P = (220)2/1936

P = 25 W

Therefore, the total power drawn by the four bulbs connected in series is 25 W, which corresponds to Option 4.

Question 153

Which of the following statements is true about inertia?

  1. AOption (a)

    Heavier objects have less inertia.

  2. BOption (b)

    Inertia is the tendency of an object to resist changes in its state of motion. 

  3. COption (c)

    Inertia depends only on the speed of the object. 

  4. DOption (d)

    An object at rest has no inertia.

View answer & explanation

Correct answer

Answer: (b)B.

Inertia is the tendency of an object to resist changes in its state of motion. 

Why this answer is correct

CONCEPT:

Inertia

  • Inertia is the property of an object by which it resists any change in its state of motion or rest.
  • This means that an object at rest tends to stay at rest, and an object in motion tends to stay in motion unless acted upon by an external force.
  • Inertia is directly related to the mass of the object; the greater the mass, the greater the inertia.

EXPLANATION:

  • "Heavier objects have less inertia."
  • This is incorrect because heavier objects (objects with more mass) actually have more inertia, not less.
  • "Inertia is the tendency of an object to resist changes in its state of motion."
  • This is correct because it describes the fundamental concept of inertia accurately.
  • "Inertia depends only on the speed of the object."
  • This is incorrect because inertia depends on the mass of the object, not its speed.
  • "An object at rest has no inertia."
  • This is incorrect because an object at rest also has inertia. Inertia is independent of whether the object is at rest or in motion.

Therefore, the correct answer is "Inertia is the tendency of an object to resist changes in its state of motion."

Question 154

A concave lens produces an image at a distance of −10 cm, when the object is placed 30 cm from the lens. What is the focal length of the lens? 

  1. AOption (a)

    −15 cm

  2. BOption (b)

    −20 cm

  3. COption (c)

     −7.5 cm

  4. DOption (d)

    15 cm

View answer & explanation

Correct answer

Answer: (a)A.

−15 cm

Why this answer is correct

CONCEPT:

Lens Formula

  • The lens formula relates the object distance (u), the image distance (v), and the focal length (f) of a lens. It is given as:

1/f = 1/v - 1/u

  • Here:
  • f = focal length of the lens
  • v = image distance (negative for virtual images)
  • u = object distance (always negative for concave lenses)

EXPLANATION:

  • Given data:
  • Image distance (v) = -10 cm (negative as the image is virtual)
  • Object distance (u) = -30 cm (negative as the object is on the same side as the light entering the lens)
  • Using the lens formula:

1/f = 1/v - 1/u

1/f = 1/(-10) - 1/(-30)

  • Calculating:

1/f = -1/10 + 1/30

1/f = (-3 + 1)/30

1/f = -2/30

f = -30/2

f = -15 cm

Therefore, the focal length of the lens is -15 cm.

Question 155

Concert or cinema halls are made with curved ceilings to spread the sound _____

  1. AOption (a)

    evenly after absorption 

  2. BOption (b)

    unevenly after reflection 

  3. COption (c)

    unevenly before reflection

  4. DOption (d)

    evenly after reflection

View answer & explanation

Correct answer

Answer: (d)D.

evenly after reflection

Why this answer is correct

CONCEPT:

Curved Ceilings in Concert or Cinema Halls

  • Concert or cinema halls are designed with curved ceilings to improve the acoustics of the space.
  • The primary aim of these curved ceilings is to ensure that sound waves are distributed evenly across the hall after reflection, enhancing the auditory experience for all listeners.
  • The curvature of the ceiling helps in directing sound waves uniformly so that the audience, regardless of their seating position, hears the sound clearly and with the same intensity.

EXPLANATION:

  • When sound waves hit a curved surface, they are reflected and scattered in such a way that they cover a wide area more uniformly.
  • This property of curved surfaces ensures that sound does not concentrate in one spot or get absorbed unevenly, but instead spreads out evenly after reflection.
  • In the given question, the correct answer is evenly after reflection because the curved ceilings are specifically designed to reflect sound waves evenly across the hall.

Therefore, concert or cinema halls have curved ceilings to spread the sound evenly after reflection, ensuring a balanced auditory experience for all attendees.

Question 156

What determines the extent of Rayleigh scattering in a medium? 

  1. AOption (a)

    Pressure of the medium 

  2. BOption (b)

    Temperature of the medium

  3. COption (c)

    Wavelength of light

  4. DOption (d)

    Size of the particles

View answer & explanation

Correct answer

Answer: (c)C.

Wavelength of light

Why this answer is correct

CONCEPT:

Rayleigh Scattering

  • Rayleigh scattering occurs when light is scattered by particles that are much smaller than the wavelength of light.
  • The intensity of Rayleigh scattering is inversely proportional to the fourth power of the wavelength.
  • Mathematically, scattering intensity ∝ 1 / λ4.

EXPLANATION:

  • The given question asks what determines the extent of Rayleigh scattering in a medium.
  • According to Rayleigh’s law:
  • Shorter wavelengths scatter much more than longer wavelengths.
  • This is why blue light (short wavelength) scatters more than red light (long wavelength).
  • Pressure and temperature do not directly control Rayleigh scattering.
  • The size of particles determines the type of scattering (Rayleigh or Mie), but not the extent within Rayleigh scattering itself.

Therefore, the extent of Rayleigh scattering depends on the wavelength of light.

Question 157

Which of the following statements is true regarding position and displacement vectors? 

  1. AOption (a)

    Displacement vector is dependent on the path taken between two points. 

  2. BOption (b)

    Displacement vector can be zero even if the position changes.  

  3. COption (c)

     Position vector always changes with time, while displacement vector remains constant. 

  4. DOption (d)

    Position vector is always larger than the displacement vector.

View answer & explanation

Correct answer

Answer: (b)B.

Displacement vector can be zero even if the position changes.  

Why this answer is correct

CONCEPT:

Position and Displacement Vectors

  • A position vector defines the location of a point in a coordinate system with respect to a reference point (origin).
  • A displacement vector represents the shortest distance between the initial and final positions of a point, with direction from the initial to the final position.
  • Displacement is independent of the path taken between two points and only considers the straight-line distance.
  • If an object returns to its starting point, the displacement vector becomes zero, even though the position may have changed during the journey.

EXPLANATION:

  • Option 1: Displacement vector is dependent on the path taken between two points – This is incorrect because displacement only depends on the initial and final positions, not the path taken.
  • Option 2: Displacement vector can be zero even if the position changes – This is correct. If an object moves and returns to its original position, the displacement vector is zero as there is no net change in position.
  • Option 3: Position vector always changes with time, while displacement vector remains constant – This is incorrect because the displacement vector changes as the position changes.
  • Option 4: Position vector is always larger than the displacement vector – This is incorrect because the position vector and displacement vector cannot be compared in terms of size; they represent different concepts.

Therefore, the correct answer is Option 2: Displacement vector can be zero even if the position changes.

Question 158

A deficiency of which nutrient can lead to stunted growth and yellowing of leaves? 

  1. AOption (a)

    Nitrogen

  2. BOption (b)

    Calcium

  3. COption (c)

    Phosphorus

  4. DOption (d)

    Potassium

View answer & explanation

Correct answer

Answer: (a)A.

Nitrogen

Why this answer is correct

CONCEPT:

Role of Nitrogen in Plants

  • Nitrogen is a vital macronutrient for plants and plays a significant role in their growth and development.
  • It is a major component of chlorophyll, which is essential for photosynthesis.
  • Nitrogen is also a key element in amino acids, proteins, and nucleic acids, which are crucial for cell division and growth.

EXPLANATION:

  • A deficiency of nitrogen in plants can lead to:
  • Stunted Growth: Since nitrogen is essential for cell division and elongation, a lack of it restricts growth.
  • Yellowing of Leaves: Without sufficient nitrogen, chlorophyll production decreases, causing leaves to turn yellow, a condition known as chlorosis.
  • Other options:
  • Calcium: Deficiency affects cell wall structure but does not cause yellowing of leaves.
  • Phosphorus: Deficiency leads to dark green or purplish leaves, not yellowing.
  • Potassium: Deficiency causes browning of leaf edges, not stunted growth or yellowing.

Therefore, the correct answer is Option 1: Nitrogen.

Question 159

Whenever a magnet is moved towards a coil, a potential difference is induced in the coil. If we decrease the speed with which the magnet is moved towards the coil, then which of the following will be true?

  1. AOption (a)

    The induced current in the coil increases. 

  2. BOption (b)

    The induced potential difference remains the same.

  3. COption (c)

    The induced potential difference in the coil decreases.

  4. DOption (d)

    The induced potential difference in the coil increases. 

View answer & explanation

Correct answer

Answer: (c)C.

The induced potential difference in the coil decreases.

Why this answer is correct

CONCEPT:

Electromagnetic Induction

  • Whenever a magnet is moved towards or away from a coil, a change in the magnetic flux linked with the coil occurs.
  • This change in magnetic flux induces a potential difference (emf) in the coil according to Faraday's law of electromagnetic induction.
  • The magnitude of the induced potential difference is directly proportional to the rate of change of magnetic flux.
  • Faraday’s law can be represented as:

Induced emf (ε) = -dΦ/dt

where Φ is the magnetic flux, and dΦ/dt is its rate of change.

EXPLANATION:

  • When the speed of the magnet's movement towards the coil decreases, the rate of change of magnetic flux (dΦ/dt) decreases.
  • Since the induced emf (or potential difference) is directly proportional to the rate of change of magnetic flux, a decrease in dΦ/dt will result in a decrease in the induced potential difference.
  • Thus, the induced potential difference in the coil decreases when the speed of the magnet's movement is reduced.

Therefore, the correct answer is The induced potential difference in the coil decreases.

Question 160

Which of the following statements about the human digestive system is correct?

  1. AOption (a)

    The large intestine is responsible for the majority of nutrient absorption.

  2. BOption (b)

    The small intestine is where most of the digestion and absorption occurs.

  3. COption (c)

    The primary site for the absorption of nutrients is the stomach. 

  4. DOption (d)

     Bile is produced by the pancreas. 

View answer & explanation

Correct answer

Answer: (b)B.

The small intestine is where most of the digestion and absorption occurs.

Why this answer is correct

CONCEPT:

Human Digestive System

  • The human digestive system is responsible for breaking down food into nutrients, which the body absorbs to function effectively.
  • The process involves various organs, including the mouth, esophagus, stomach, small intestine, large intestine, liver, pancreas, and gallbladder.
  • The small intestine plays a crucial role in digestion and nutrient absorption.

EXPLANATION:

  • "The large intestine is responsible for the majority of nutrient absorption." - Incorrect
  • The large intestine primarily absorbs water and electrolytes, not nutrients.
  • "The small intestine is where most of the digestion and absorption occurs." - Correct
  • The small intestine has structures like villi and microvilli that maximize nutrient absorption.
  • Enzymes from the pancreas and bile from the liver aid in breaking down food in the small intestine.
  • "The primary site for the absorption of nutrients is the stomach." - Incorrect
  • The stomach primarily focuses on breaking down proteins and producing chyme. It is not the main site of nutrient absorption.
  • "Bile is produced by the pancreas." - Incorrect
  • Bile is produced by the liver and stored in the gallbladder, not the pancreas.

Therefore, the correct answer is "The small intestine is where most of the digestion and absorption occurs."

Discipline 4 (20 questions)

Question 161

Which part of the nervous system is primarily responsible for the 'fight or flight' response?

  1. AOption (a)

    Central nervous system  

  2. BOption (b)

    Peripheral nervous system 

  3. COption (c)

     Somatic nervous system

  4. DOption (d)

    Autonomic nervous system

View answer & explanation

Correct answer

Answer: (d)D.

Autonomic nervous system

Why this answer is correct

CONCEPT:

Autonomic Nervous System (ANS)

  • The autonomic nervous system is a part of the peripheral nervous system that controls involuntary body functions, such as heart rate, blood pressure, digestion, and breathing.
  • It has two main divisions:
  • Sympathetic Nervous System (SNS): Responsible for the "fight or flight" response, which prepares the body to respond to stress or danger.
  • Parasympathetic Nervous System (PNS): Responsible for the "rest and digest" response, which conserves energy and restores the body to a calm state.

EXPLANATION:

  • The "fight or flight" response is primarily controlled by the sympathetic division of the autonomic nervous system.
  • When a threat or stressor is detected, the sympathetic nervous system activates several physiological changes, including:
  • Increased heart rate and blood pressure to supply more oxygen and nutrients to muscles.
  • Dilation of pupils to enhance vision.
  • Suppression of non-essential functions, such as digestion, to focus energy on immediate survival.
  • The central nervous system (CNS) and peripheral nervous system (PNS) are general divisions of the nervous system, but the specific "fight or flight" response is governed by the autonomic nervous system.

Therefore, the correct answer is  Autonomic nervous system.

Question 162

When light is incident from an optically rarer medium (1) to an optically denser medium (2), the refractive index n21 is

  1. AOption (a)

    greater than 1

  2. BOption (b)

     less than 1 

  3. COption (c)

    equal to 1  

  4. DOption (d)

     undeterminable with the given information 

View answer & explanation

Correct answer

Answer: (a)A.

greater than 1

Why this answer is correct

CONCEPT:

Refractive Index (n)

n21 = n2 / n1

  • The refractive index is a measure of how much the speed of light is reduced inside a medium as compared to its speed in a vacuum.
  • When light travels from one medium to another, its speed and direction change, which is described by Snell's Law:
  • Here:
  • n21 is the refractive index of medium 2 with respect to medium 1.
  • n2 and n1 are the refractive indices of medium 2 and medium 1 respectively.

EXPLANATION:

  • When light travels from an optically rarer medium (e.g., air) to an optically denser medium (e.g., glass), the speed of light decreases.
  • The refractive index of a medium is inversely proportional to the speed of light in that medium.
  • For an optically denser medium (2) compared to a rarer medium (1), n2 > n1.
  • Therefore, the refractive index n21 = n2 / n1 will be greater than 1.

Therefore, the correct answer is  greater than 1.

Question 163

What is the primary benefit of intercropping in agriculture?

  1. AOption (a)

    Simplified farming practices

  2. BOption (b)

    Reduced pest populations 

  3. COption (c)

    Increased use of chemical fertilizers

  4. DOption (d)

    Higher labour costs 

View answer & explanation

Correct answer

Answer: (b)B.

Reduced pest populations 

Why this answer is correct

CONCEPT:

Intercropping in Agriculture

  • Intercropping is the agricultural practice of growing two or more crops together in the same field during a growing season.
  • The primary aim of intercropping is to maximize the utilization of resources such as sunlight, water, and nutrients, and to achieve better pest management.
  • It also helps in improving soil fertility and reducing the dependency on chemical fertilizers and pesticides.

EXPLANATION:

  • The primary benefit of intercropping is reduced pest populations. This is because:
  • When multiple crops are grown together, it creates a more diverse ecosystem, which makes it harder for pests to spread and thrive.
  • Certain crops in the intercropping system can act as natural pest repellents, reducing the need for chemical pesticides.
  • Other benefits include:
  • Better utilization of resources (e.g., water and nutrients) as different crops have varying requirements.
  • Improved soil structure and fertility due to the complementary nature of different crops.

​Therefore, the correct answer is Reduced pest populations.

Question 164

Which of the following is NOT true about hybridisation in mammals?

  1. AOption (a)

    It can have an important effect on the evolutionary patterns in cross-breeding taxa. 

  2. BOption (b)

     Introgressive hybridisation can not contribute to speciation. 

  3. COption (c)

    Interspecific hybridisation has been considered as a maladaptive process, which threatens species genetic integrity and survival. 

  4. DOption (d)

     Introgressive hybridisation can affect creation, maintenance and loss of biodiversity.

View answer & explanation

Correct answer

Answer: (b)B.

 Introgressive hybridisation can not contribute to speciation. 

Why this answer is correct

CONCEPT:

Hybridisation in Mammals

  • Hybridisation refers to the process of mating between individuals from different species or populations, leading to offspring with mixed genetic traits.
  • It plays a significant role in evolutionary biology, as it can influence speciation, adaptation, and biodiversity.
  • Introgressive hybridisation is the incorporation of genetic material from one species into the gene pool of another through repeated backcrossing.
  • While hybridisation can sometimes threaten genetic integrity, it can also contribute positively to the evolution and diversity of species.

EXPLANATION:

  • The question requires identifying the incorrect statement about hybridisation in mammals.
  • Let us evaluate each option:
  • Option 1: "It can have an important effect on the evolutionary patterns in cross-breeding taxa."

This statement is true as hybridisation often influences evolutionary dynamics in cross-breeding taxa by introducing genetic variation.

  • Option 2: "Introgressive hybridisation can not contribute to speciation."

This statement is NOT true. Introgressive hybridisation can indeed contribute to speciation by introducing new genetic combinations that may lead to the emergence of new species. Hence, this is the correct answer.

  • Option 3: "Interspecific hybridisation has been considered as a maladaptive process, which threatens species genetic integrity and survival."

This statement is true. In some cases, hybridisation is maladaptive as it can lead to outbreeding depression or the loss of genetic identity.

  • Option 4: "Introgressive hybridisation can affect creation, maintenance and loss of biodiversity."

This statement is true. Introgressive hybridisation can influence biodiversity by either increasing genetic diversity or contributing to the extinction of species through genetic homogenisation.

  • Based on the above explanation, the only incorrect statement is Option 2.

Therefore, the correct answer is Option 2: "Introgressive hybridisation can not contribute to speciation."

Question 165

When a boxer moves his head backward while receiving a punch, the impulse received by his head _______.

  1. AOption (a)

     remains the same 

  2. BOption (b)

    decreases

  3. COption (c)

    becomes zero 

  4. DOption (d)

    increases 

View answer & explanation

Correct answer

Answer: (b)B.

decreases

Why this answer is correct

CONCEPT:

Impulse and Momentum

  • Impulse is the product of force and the time duration for which the force acts. It is related to the change in momentum of an object.
  • Mathematically, impulse can be expressed as:

Impulse = Force × Time = Change in Momentum

  • When a force acts on an object for a longer duration, the impulse increases. Conversely, if the interaction time increases, the force experienced decreases proportionally.

EXPLANATION:

  • When a boxer moves his head backward while receiving a punch:
  • The duration of interaction (time) between the punch and the head increases.
  • As the interaction time increases, the force exerted by the punch on the head decreases.
  • Impulse is the product of force and time, and since the force decreases due to the increased interaction time, the overall impulse received by the head decreases.

Therefore, the correct answer is decreases.

Question 166

Select the immunoglobulin which is implicated in immune system responses to most parasitic worms and is important during immune defense against certain protozoan parasites.

  1. AOption (a)

     Immunoglobulin alpha

  2. BOption (b)

    Immunoglobulin gamma

  3. COption (c)

    Immunoglobulin epsilon

  4. DOption (d)

     Immunoglobulin delta 

View answer & explanation

Correct answer

Answer: (c)C.

Immunoglobulin epsilon

Why this answer is correct

CONCEPT:

Immunoglobulin Epsilon (IgE)

  • Immunoglobulin E (IgE) is a type of antibody that plays a crucial role in the immune system, particularly in allergic reactions and defense against parasitic infections.
  • It is predominantly involved in the immune response to parasitic worms (helminths) and certain protozoan parasites.
  • IgE binds to receptors on the surface of mast cells and basophils, leading to the release of histamine and other inflammatory mediators, which help combat the parasites.

EXPLANATION:

  • In the context of parasitic worm infections:
  • IgE is produced in response to the presence of antigens from parasitic worms.
  • When IgE binds to these antigens, it triggers the activation of mast cells and basophils.
  • This leads to the release of substances like histamine, which increases the permeability of blood vessels and recruits immune cells to the site of infection.
  • In the case of protozoan parasites:
  • IgE also plays a role in signaling the immune system to attack these pathogens.
  • Although its role in protozoan infections is less pronounced compared to helminths, it is still significant in certain cases.

Therefore, the correct answer is Immunoglobulin epsilon (IgE).

Question 167

The parietal cells of the gastric glands lining the stomach are responsible for the secretion of:

  1. AOption (a)

    Hydrochloric acid 

  2. BOption (b)

    Pepsinogen

  3. COption (c)

    Gastrin

  4. DOption (d)

    Somatostatin

View answer & explanation

Correct answer

Answer: (a)A.

Hydrochloric acid 

Why this answer is correct

CONCEPT:

Parietal Cells and Their Function

  • The parietal cells are specialized cells present in the gastric glands of the stomach lining.
  • These cells play a crucial role in digestion by secreting hydrochloric acid (HCl).
  • Hydrochloric acid creates an acidic environment in the stomach, which is essential for:
  • Activating the enzyme pepsinogen into its active form, pepsin.
  • Breaking down food particles and aiding digestion.
  • Providing defense against pathogens by killing harmful microorganisms ingested with food.

EXPLANATION:

  • Hydrochloric acid (HCl) - Correct. Parietal cells are responsible for secreting HCl.
  • Pepsinogen - Incorrect. Pepsinogen is secreted by chief cells, not parietal cells.
  • Gastrin - Incorrect. Gastrin is a hormone secreted by G-cells in the stomach lining.
  • Somatostatin - Incorrect. Somatostatin is secreted by D-cells, not parietal cells.

Therefore, the parietal cells of the gastric glands lining the stomach are responsible for the secretion of hydrochloric acid.

Question 168

What is the primary cause of the depletion of the ozone layer?

  1. AOption (a)

    Nitrous oxide 

  2. BOption (b)

    Methane emissions 

  3. COption (c)

    Chlorofluorocarbons (CFCs)

  4. DOption (d)

    Carbon dioxide emissions

View answer & explanation

Correct answer

Answer: (c)C.

Chlorofluorocarbons (CFCs)

Why this answer is correct

Here is the answer with the concept and explanation in HTML format:

CONCEPT:

Ozone Layer Depletion

  • The ozone layer is a protective shield in the Earth's stratosphere that absorbs most of the Sun's harmful ultraviolet (UV) radiation.
  • Certain man-made chemicals, primarily chlorofluorocarbons (CFCs), are the main cause of ozone depletion.
  • When CFCs are released into the atmosphere, they rise to the stratosphere and undergo photodissociation due to UV radiation, releasing chlorine atoms.
  • These chlorine atoms react with ozone (O3) molecules, breaking them down into oxygen (O2) and chlorine monoxide (ClO).
  • As a result, the ozone layer becomes thinner, reducing its ability to block harmful UV rays.

EXPLANATION:

  • The primary cause of ozone depletion is chlorofluorocarbons (CFCs), which are used in refrigeration, air conditioning, foam production, and aerosol propellants.
  • When CFCs reach the stratosphere, UV radiation breaks them apart, releasing chlorine atoms. Each chlorine atom can destroy thousands of ozone molecules through a series of chain reactions.
  • Other gases such as nitrous oxide and methane also play a role, but their impact is significantly smaller compared to CFCs.
  • Carbon dioxide emissions, while a major contributor to climate change, do not directly cause ozone layer depletion.

Therefore, the primary cause of the depletion of the ozone layer is chlorofluorocarbons (CFCs).

Question 169

Which of the following is FALSE about ovaries in vertebrates? 

  1. AOption (a)

    In female anamniotes, ovaries are large and occupying much of the body cavity.

  2. BOption (b)

     Mammals have small ovaries and the eggs contain little yolk. 

  3. COption (c)

    In amniotes, ovaries produce fewer eggs and the fertilisation is internal

  4. DOption (d)

    Ovaries of reptiles and birds are small and the eggs contain little yolk. 

View answer & explanation

Correct answer

Answer: (d)D.

Ovaries of reptiles and birds are small and the eggs contain little yolk. 

Why this answer is correct

CONCEPT:

Ovaries in Vertebrates

  • Ovaries are the primary female reproductive organs in vertebrates, responsible for the production of eggs (ova) and secretion of hormones.
  • The structure and function of ovaries vary depending on the group of vertebrates (e.g., anamniotes, amniotes, mammals, reptiles, and birds).
  • In general:
  • Anamniotes (e.g., fishes and amphibians) often have large ovaries with numerous eggs, as external fertilization is common.
  • Amniotes (e.g., reptiles, birds, and mammals) tend to have smaller ovaries and produce fewer eggs, as internal fertilization is the norm.
  • Mammalian eggs typically have little yolk due to the presence of a placenta in placental mammals.
  • Reptiles and birds produce eggs with large quantities of yolk to nourish the developing embryo.

EXPLANATION:

  • The correct answer is "Ovaries of reptiles and birds are small and the eggs contain little yolk."
  • This statement is FALSE because:
  • In reptiles and birds, the ovaries are not necessarily small, and their eggs contain a large amount of yolk to support the development of the embryo.
  • The presence of yolk is crucial for nourishment, as the embryos develop outside the mother's body (in eggs).

Additional Information

  • In female anamniotes, ovaries are indeed large and occupy much of the body cavity due to the production of numerous eggs.
  • Mammals have relatively small ovaries, and their eggs contain little yolk because embryos are nourished by the placenta (in placental mammals).
  • In amniotes, fewer eggs are produced, and internal fertilization is typical.

Therefore, the statement "Ovaries of reptiles and birds are small and the eggs contain little yolk" is FALSE.

Question 170

Which of the following is a characteristic feature of freshwater biomes?

  1. AOption (a)

    Variability in temperature and flow rates

  2. BOption (b)

    Presence of saltwater species 

  3. COption (c)

    Low nutrient availability

  4. DOption (d)

    High salinity levels

View answer & explanation

Correct answer

Answer: (a)A.

Variability in temperature and flow rates

Why this answer is correct

CONCEPT:

Freshwater Biomes

  • Freshwater biomes are ecosystems found in water bodies with low salt concentration such as lakes, rivers, ponds, and streams.
  • These biomes support a wide range of species that are adapted to low salinity environments.
  • Key characteristics include variability in temperature, flow rates, and nutrient availability.

EXPLANATION:

  • Freshwater biomes often experience changes in temperature and flow rates due to seasonal variations, geographical factors, and external influences such as rainfall.
  • Unlike saltwater environments, freshwater biomes do not have high salinity levels.
  • Saltwater species are not typically found in freshwater biomes because they require saline conditions to survive.
  • While nutrient availability can vary, freshwater biomes usually have moderate nutrient levels compared to marine systems.
  • Thus, the defining feature of freshwater biomes is their variability in temperature and flow rates.

Therefore, the correct answer is Variability in temperature and flow rates.

Question 171

Following the sign convention, if the magnification produced by the lens is negative, the image is ___________ 

  1. AOption (a)

     inverted and virtual 

  2. BOption (b)

     inverted and rea

  3. COption (c)

     erect and real 

  4. DOption (d)

     magnification cannot be negative

View answer & explanation

Correct answer

Answer: (b)B.

 inverted and rea

Why this answer is correct

CONCEPT:

Magnification in Lenses

  • Magnification (m) is the ratio of the height of the image to the height of the object.
  • It is given by the formula:

m = -v/u

where:

  • v = Image distance
  • u = Object distance
  • The sign convention for magnification is as follows:
  • If m is positive, the image is erect (upright).
  • If m is negative, the image is inverted.
  • Real images are always inverted, and virtual images are always erect.

EXPLANATION:

 

  • In this question, the magnification produced by the lens is negative.
  • According to the sign convention:
  • Negative magnification indicates that the image is inverted.
  • Since inverted images formed by lenses are always real, the image is real and inverted.

Therefore, the correct answer is: Option 2 - inverted and real.

Question 172

During the nitrogen cycle, which bacterial group is primarily responsible for the process of denitrification, converting nitrates (NO₃⁻) back into atmospheric nitrogen (N₂)? 

  1. AOption (a)

    Pseudomonas

  2. BOption (b)

    Azotobacter

  3. COption (c)

    Rhizobium

  4. DOption (d)

    More than one of the above

  5. EOption (e)

    None of the above

View answer & explanation

Correct answer

Answer: (a)A.

Pseudomonas

Why this answer is correct

CONCEPT:

Denitrification in the Nitrogen Cycle

  • Denitrification is a crucial step in the nitrogen cycle where nitrates (NO₃⁻) are converted back into atmospheric nitrogen (N₂).
  • This process is carried out by specific groups of bacteria under anaerobic (low oxygen) conditions.
  • Denitrifying bacteria use nitrates as an alternative electron acceptor in the absence of oxygen.

EXPLANATION:

  • The bacterial group primarily responsible for denitrification is Pseudomonas.
  • Pseudomonas and other denitrifying bacteria reduce nitrates (NO₃⁻) to nitrogen gas (N₂) or nitrous oxide (N₂O), which are released into the atmosphere.

Additional Information

  • Azotobacter is involved in nitrogen fixation, converting atmospheric nitrogen (N₂) into ammonia (NH₃).
  • Rhizobium also participates in nitrogen fixation in symbiotic association with leguminous plants.
  • Nitrosomonas is involved in nitrification, converting ammonia (NH₃) into nitrites (NO₂⁻).

Therefore, the correct answer is Pseudomonas.

Question 173

Which of the following are widely used in biomonitoring programmes and ecotoxicological studies? 

  1. AOption (a)

    Pila

  2. BOption (b)

    Scypha

  3. COption (c)

    Daphnia

  4. DOption (d)

    Sea star 

View answer & explanation

Correct answer

Answer: (c)C.

Daphnia

Why this answer is correct

CONCEPT:

Biomonitoring and Ecotoxicological Studies

  • Biomonitoring refers to the use of organisms or biological responses to evaluate changes in the environment, typically to detect pollution or assess the health of ecosystems.
  • Ecotoxicological studies involve the study of toxic effects of substances on living organisms, especially in their natural environment.
  • Indicator species are organisms that are widely used in these studies because they respond predictably to environmental changes and pollutants.

EXPLANATION:

  • Pila: A freshwater snail, not commonly used in biomonitoring or ecotoxicology.
  • Scypha: A sponge, not widely used for biomonitoring or ecotoxicological studies.
  • Daphnia: A type of planktonic crustacean (also known as "water flea"), widely used as an indicator organism in biomonitoring and ecotoxicological studies due to its sensitivity to pollutants such as heavy metals, pesticides, and other toxic substances.
  • Sea star: A marine organism, not a standard choice for biomonitoring or ecotoxicology.
  • Daphnia is the correct answer because:
  • It has a short life cycle, making it suitable for toxicity testing.
  • It is highly sensitive to changes in water quality and pollution levels.
  • It is easy to culture and test in laboratory conditions.

Therefore, the correct answer is  Daphnia.

Question 174

Which type of cartilage is most abundant in the human body and provides support while allowing flexibility? 

  1. AOption (a)

    Fibrocartilage

  2. BOption (b)

     Elastic cartilage 

  3. COption (c)

    Calcified cartilage

  4. DOption (d)

    Hyaline cartilage

View answer & explanation

Correct answer

Answer: (d)D.

Hyaline cartilage

Why this answer is correct

CONCEPT:

Hyaline Cartilage

  • Hyaline cartilage is the most abundant type of cartilage in the human body.
  • It provides support and flexibility, making it ideal for functions like cushioning joints and maintaining structural integrity in areas such as the nose, trachea, and larynx.
  • It is composed of a smooth extracellular matrix with a high concentration of collagen fibers and proteoglycans, which allows it to resist compression and provide a smooth surface for joint movement.

EXPLANATION:

  • Hyaline cartilage is found in areas like the nose, trachea, and at the ends of long bones (articular cartilage).
  • Its smooth and glassy appearance reduces friction between bones in joints, ensuring smooth movement.
  • Other types of cartilage include:
  • Fibrocartilage: Found in intervertebral discs and the meniscus of the knee; it provides tensile strength and can resist heavy pressure.
  • Elastic cartilage: Found in the ear and epiglottis; it provides elasticity and support.
  • Calcified cartilage: A form of cartilage that has become hardened due to calcium deposits, but it is not as common or abundant as hyaline cartilage.
  • Hyaline cartilage's unique composition and distribution make it the most abundant type of cartilage in the human body.

Therefore, the correct answer is Hyaline cartilage.

Question 175

Which of the following processes of nitrogen fixation involves the use of higher amount of fossil fuel energy?  

  1. AOption (a)

    Electrochemical nitrogen fixation

  2. BOption (b)

    Industrial nitrogen fixation

  3. COption (c)

    Photochemical nitrogen fixation

  4. DOption (d)

    Biological nitrogen fixation

View answer & explanation

Correct answer

Answer: (b)B.

Industrial nitrogen fixation

Why this answer is correct

CONCEPT:

Nitrogen Fixation Processes

  • Nitrogen fixation is the process by which atmospheric nitrogen (N2) is converted into a usable form, such as ammonia (NH3).
  • There are several methods of nitrogen fixation:
  • Biological nitrogen fixation: Carried out by certain bacteria and archaea, using the enzyme nitrogenase.
  • Photochemical nitrogen fixation: Occurs naturally through processes like lightning.
  • Electrochemical nitrogen fixation: Uses electricity to drive the reaction.
  • Industrial nitrogen fixation: Typically refers to the Haber-Bosch process, which requires high temperatures and pressures to produce ammonia. This process consumes large amounts of fossil fuel energy.

EXPLANATION:

  • Industrial nitrogen fixation (Haber-Bosch process) involves the use of high temperatures (400–500°C) and high pressures (150–200 atm) to convert nitrogen gas (N2) and hydrogen gas (H2) into ammonia (NH3).
  • This process relies heavily on fossil fuels to generate the energy required for maintaining the extreme conditions.
  • Biological, photochemical, and electrochemical processes do not consume fossil fuels to the same extent.

Therefore, the correct answer is Industrial nitrogen fixation.

Question 176

What is the primary function of the testes in the male reproductive system?

  1. AOption (a)

    To produce testosterone and sperm

  2. BOption (b)

    To store sperm

  3. COption (c)

    To secrete seminal fluid

  4. DOption (d)

    To produce estrogen 

View answer & explanation

Correct answer

Answer: (a)A.

To produce testosterone and sperm

Why this answer is correct

CONCEPT:

Primary Function of the Testes

  • The testes are the primary reproductive organs in males.
  • They perform two essential functions:
  • Production of sperm (spermatogenesis), which is necessary for reproduction.
  • Secretion of testosterone, the male sex hormone responsible for the development of secondary sexual characteristics and regulation of reproductive functions.
  • These functions are crucial for male fertility and the maintenance of male physiological traits.

Additional Information

  • The testes do not primarily store sperm; this function is carried out by the epididymis.
  • Seminal fluid is secreted by accessory glands like the seminal vesicles, prostate gland, and bulbourethral glands, not the testes.
  • Estrogen is a female sex hormone and is not produced by the testes.
  • The testes are therefore specialized for both hormone production and the generation of male gametes (sperm cells).

Thus, the primary function of the testes is to produce testosterone and sperm.

Question 177

If a gun recoils when it is fired, the forward motion of the bullet is an example of a/an_______.

  1. AOption (a)

     reaction force 

  2. BOption (b)

    action force

  3. COption (c)

    frictional force

  4. DOption (d)

    gravitational force

View answer & explanation

Correct answer

Answer: (b)B.

action force

Why this answer is correct

CONCEPT:

Action and Reaction Forces

  • According to Newton's Third Law of Motion, for every action, there is an equal and opposite reaction.
  • When a force is applied to an object, it exerts an equal and opposite force back on the object that caused it.
  • This principle explains the motion of objects and interactions between them.

EXPLANATION:

  • In the given scenario:
  • When the gun is fired, a force is exerted on the bullet to propel it forward.
  • This force is called the action force.
  • As a result, the gun experiences a force in the opposite direction, causing it to recoil. This is the reaction force.
  • The forward motion of the bullet is an example of an action force, as it represents the initial force applied to the bullet.
  • The recoil of the gun is the result of the reaction force, which balances the action force as per Newton's Third Law.

Therefore, the correct answer is Action Force.

Question 178

An air-filled solenoid, having 200 turns per cm, carries a current of 2 A, the magnetic field strength in Tesla at the centre of the solenoid will be: (Take the value of μo = 4π × 10−7 Tm/A)

  1. AOption (a)

    8π × 10-2

  2. BOption (b)

    8π × 10-3 

  3. COption (c)

    16π × 10-3

  4. DOption (d)

    16 × 10-2 

View answer & explanation

Correct answer

Answer: (c)C.

16π × 10-3

Why this answer is correct

CONCEPT:

Magnetic Field Strength Inside a Solenoid

  • The magnetic field strength at the center of a solenoid can be calculated using Ampere's law.
  • The formula for the magnetic field inside an ideal solenoid is:

B = μo × n × I

where:

  • B is the magnetic field strength (in Tesla).
  • μo is the permeability of free space (μo = 4π × 10−7 Tm/A).
  • n is the number of turns per unit length of the solenoid (in turns/m).
  • I is the current passing through the solenoid (in Ampere).

EXPLANATION:

  • Given:
  • n = 200 turns per cm = 200 × 100 = 20000 turns/m
  • I = 2 A
  • μo = 4π × 10−7 Tm/A
  • Using the formula B = μo × n × I:
  • B = (4π × 10−7) × (20000) × (2)
  • B = 16π × 10−3 T
  • Therefore, the magnetic field strength at the center of the solenoid is 16π × 10−3 T.

The correct answer is 16π × 10−3 T.

Question 179

Which of the following is the most effective strategy to control air pollution from vehicular emissions in urban areas? 

  1. AOption (a)

    Encouraging the use of public transportation 

  2. BOption (b)

    Reducing the speed limit on highways

  3. COption (c)

     Increasing the number of traffic signals

  4. DOption (d)

    Expanding road networks to accommodate more vehicles

View answer & explanation

Correct answer

Answer: (a)A.

Encouraging the use of public transportation 

Why this answer is correct

CONCEPT:

Air Pollution Control Strategies

  • Vehicular emissions are a significant source of air pollution in urban areas. Controlling these emissions is critical to improving air quality and public health.
  • Strategies to reduce vehicular emissions involve promoting sustainable and environmentally friendly transportation options.

EXPLANATION:

  • Encouraging the use of public transportation is the most effective strategy because it reduces the number of vehicles on the road, leading to lower emissions per capita.
  • Reducing the speed limit on highways may have a limited impact as it primarily affects highway emissions and doesn't address the core issue of vehicle density in urban areas.
  • Increasing the number of traffic signals could lead to more frequent stops and starts, potentially increasing emissions rather than reducing them.
  • Expanding road networks to accommodate more vehicles is counterproductive as it encourages increased vehicle use, leading to higher overall emissions.
  • Public transportation systems such as buses, trains, and metros can carry a large number of passengers, significantly reducing the number of vehicles on the road and the associated emissions.

Therefore, the most effective strategy to control air pollution from vehicular emissions in urban areas is encouraging the use of public transportation.

Question 180

An optician prescribes his patient a corrective lens of power +1.25 D; the focal length (in metres) will be _____ and the type of lens is ___________. 

  1. AOption (a)

    +0.80, concave lens

  2. BOption (b)

     −0.80, convex lens 

  3. COption (c)

    +0.80, convex lens 

  4. DOption (d)

    −0.80, concave lens

View answer & explanation

Correct answer

Answer: (c)C.

+0.80, convex lens 

Why this answer is correct

CONCEPT:

Power of a Lens

  • The power (P) of a lens is defined as the reciprocal of its focal length (f) in meters.
  • Mathematically, P = 1/f, where P is in diopters (D) and f is in meters.
  • Positive power indicates a convex lens, while negative power indicates a concave lens.

EXPLANATION:

  • The given power of the lens is +1.25 D.
  • Using the formula for power, P = 1/f, we can calculate the focal length (f):
  • P = +1.25 D
  • f = 1/P
  • f = 1 / 1.25
  • f = 0.80 meters
  • The positive power value indicates that the lens is a convex lens.

Therefore, the focal length of the lens is +0.80 meters, and the type of lens is a convex lens.

Discipline 5 (10 questions)

Question 181

Rhinoceros beetle is a major pest that affects __________ plants. 

  1. AOption (a)

    coconut

  2. BOption (b)

    cotton

  3. COption (c)

    tea

  4. DOption (d)

    coffee

View answer & explanation

Correct answer

Answer: (a)A.

coconut

Why this answer is correct

CONCEPT:

Rhinoceros Beetle as a Major Pest

  • The rhinoceros beetle (Oryctes rhinoceros) is a major pest that primarily affects certain agricultural and horticultural crops.
  • It is particularly harmful to coconut plants, where it damages the growing points by burrowing into the crown.
  • Rhinoceros beetle infestations can lead to reduced yield, stunted growth, and in some cases, death of the plant.

EXPLANATION:

  • Rhinoceros beetles attack the crown of coconut trees by boring into the soft tissues at the top of the trunk.
  • They feed on the sap and tissues, which weakens the tree and prevents proper leaf and fruit development.
  • The damage is specific to coconut plants, as the structure and growth pattern of coconut trees make them particularly vulnerable to the beetle's feeding habits.
  • Other plants like cotton, tea, and coffee are not significantly affected by the rhinoceros beetle, as they do not provide the suitable habitat or food source for this pest.

Therefore, the correct answer is Coconut.

Question 182

Which of the following is NOT true about hyaline cartilages?

  1. AOption (a)

     It contains many yellow elastic fibers lying in a solid matrix. 

  2. BOption (b)

    Hyaline cartilage is covered externally by a fibrous membrane, called the perichondrium, except at the articular ends of bones

  3. COption (c)

    This type of cartilage is predominately collagen and has a glassy appearance. 

  4. DOption (d)

    It contains no nerves or blood vessels, and its structure is relatively simple.

View answer & explanation

Correct answer

Answer: (a)A.

 It contains many yellow elastic fibers lying in a solid matrix. 

Why this answer is correct

CONCEPT:

Hyaline Cartilage

  • Hyaline cartilage is a type of connective tissue and is the most common type of cartilage in the human body.
  • It is composed primarily of a gel-like matrix with type II collagen fibers, giving it a smooth and glassy appearance.
  • Hyaline cartilage is found in areas such as the nose, trachea, larynx, and at the articular ends of bones where it provides cushioning and minimizes friction during joint movements.
  • It is avascular, meaning it lacks blood vessels, and is not innervated (does not contain nerves).

EXPLANATION:

  • "It contains many yellow elastic fibers lying in a solid matrix."
  • This statement is incorrect because hyaline cartilage does not contain elastic fibers. Instead, it contains type II collagen fibers, which give it its characteristic glassy appearance.
  • "Hyaline cartilage is covered externally by a fibrous membrane, called the perichondrium, except at the articular ends of bones."
  • This statement is true. The perichondrium is a fibrous connective tissue membrane that surrounds hyaline cartilage, except in articular cartilage.
  • "This type of cartilage is predominately collagen and has a glassy appearance."
  • This statement is true, as hyaline cartilage contains type II collagen and appears smooth and glassy under the microscope.
  • "It contains no nerves or blood vessels, and its structure is relatively simple."
  • This statement is true. Hyaline cartilage is avascular and lacks nerves, relying on diffusion for nutrient supply.

Therefore, the correct answer is as hyaline cartilage does not contain yellow elastic fibers.

Question 183

Which of the following excretory organs is NOT correctly matched with its waste product excreted?

  1. AOption (a)

    Liver - Excess water

  2. BOption (b)

    Lungs - Carbon dioxide

  3. COption (c)

    Skin - Urea and excess salts

  4. DOption (d)

    Kidney - Urea and excess salts 

View answer & explanation

Correct answer

Answer: (a)A.

Liver - Excess water

Why this answer is correct

CONCEPT:

Excretory Organs and Their Waste Products

  • The human body has several excretory organs, each responsible for removing specific waste products.
  • Key excretory organs include:
  • Liver: Removes toxins from the blood and produces bile. It does not excrete excess water.
  • Lungs: Expel carbon dioxide and water vapor during respiration.
  • Skin: Removes urea and excess salts through sweat.
  • Kidneys: Filter blood to excrete urea, excess salts, and water as urine.

EXPLANATION:

  • "Liver - Excess water", which is incorrect.
  • The liver primarily detoxifies harmful substances and produces bile, but it does not play a direct role in the excretion of excess water.
  • Excess water is removed by the kidneys and lungs, not the liver.
  • "Lungs - Carbon dioxide", is correct as the lungs expel carbon dioxide during respiration.
  • "Skin - Urea and excess salts", is correct since the skin excretes these through sweat.
  • "Kidney - Urea and excess salts", is correct as kidneys filter blood to remove urea, salts, and water in urine.

Therefore, the correct answer is "Liver - Excess water."

Question 184

The intercostal arteries supply blood to the muscles of the:

  1. AOption (a)

    Duodenum

  2. BOption (b)

    Pancreas

  3. COption (c)

    Chest

  4. DOption (d)

    Stomach

View answer & explanation

Correct answer

Answer: (c)C.

Chest

Why this answer is correct

CONCEPT:

Intercostal Arteries

  • Intercostal arteries are blood vessels that run between the ribs in the intercostal spaces.
  • They supply oxygenated blood to the intercostal muscles, skin, and tissues of the thoracic (chest) region.
  • Intercostal muscles play an important role in breathing movements.

EXPLANATION:

  • Intercostal muscles are located between the ribs and help in expansion and contraction of the chest during respiration.
  • Since these muscles are present in the thoracic region, the intercostal arteries primarily supply the chest muscles.
  • Digestive organs like the duodenum, pancreas, and stomach receive blood from other arteries, not intercostal arteries.

Therefore, intercostal arteries supply blood to the muscles of the chest.

Question 185

Which of the following diseases is primarily transmitted by mosquitoes?

  1. AOption (a)

     Lyme disease

  2. BOption (b)

    African trypanosomiasis

  3. COption (c)

    Zika virus 

  4. DOption (d)

     Leishmaniasis

View answer & explanation

Correct answer

Answer: (c)C.

Zika virus 

Why this answer is correct

CONCEPT:

Diseases Transmitted by Mosquitoes

  • Mosquitoes are vectors responsible for transmitting a variety of diseases to humans and animals.
  • Examples of mosquito-borne diseases include malaria, dengue, Zika virus, and yellow fever.
  • These diseases are transmitted when an infected mosquito bites a host and injects the pathogen into the host's bloodstream.

EXPLANATION:

  • Lyme disease is transmitted by ticks, not mosquitoes.
  • African trypanosomiasis (also known as sleeping sickness) is transmitted by tsetse flies, not mosquitoes.
  • Zika virus is primarily transmitted by mosquitoes, specifically the Aedes species (e.g., Aedes aegypti).
  • Leishmaniasis is transmitted by sandflies, not mosquitoes.
  • Since Zika virus is the only disease in the list that is transmitted by mosquitoes, the correct answer is Option 3.

Therefore, the correct answer is Zika virus, which is primarily transmitted by mosquitoes.

Question 186

What is the role of antibodies in the immune system?

  1. AOption (a)

    To directly kill pathogens

  2. BOption (b)

    To produce hormones

  3. COption (c)

    To transport nutrients  

  4. DOption (d)

    To bind to antigens and neutralize or mark them for destruction 

View answer & explanation

Correct answer

Answer: (d)D.

To bind to antigens and neutralize or mark them for destruction 

Why this answer is correct

CONCEPT:

Antibodies

  • Antibodies are specialized proteins produced by B-lymphocytes (a type of white blood cell).
  • They are also called immunoglobulins.
  • Antibodies play a key role in the body’s adaptive immune response.

EXPLANATION:

  • Antibodies do not directly kill pathogens.
  • Instead, they bind specifically to foreign substances called antigens present on pathogens.
  • After binding, antibodies:
  • Neutralize toxins or viruses, or
  • Mark pathogens so that immune cells (like macrophages) can recognize and destroy them.
  • Antibodies do not produce hormones and are not involved in nutrient transport.

Therefore, the role of antibodies is to bind to antigens and neutralize or mark them for destruction.

Question 187

How do vaccines work to protect against diseases?

  1. AOption (a)

    They replace the need for the immune system. 

  2. BOption (b)

    They stimulate the immune system to recognise and fight specific pathogens

  3. COption (c)

    They provide immediate immunity through the injection of antibodies. 

  4. DOption (d)

    They destroy pathogens in the body. 

View answer & explanation

Correct answer

Answer: (b)B.

They stimulate the immune system to recognise and fight specific pathogens

Why this answer is correct

CONCEPT:

Vaccines and Immunity

  • Vaccines are biological preparations that help the body develop immunity against specific diseases.
  • They contain weakened, killed pathogens or their components (antigens).
  • Vaccines work by activating the body’s immune system.

EXPLANATION:

  • When a vaccine is introduced into the body, it does not cause the disease.
  • Instead, it stimulates the immune system to recognize the specific pathogen.
  • The immune system produces antibodies and memory cells against that pathogen.
  • Later, if the same pathogen enters the body, the immune system quickly recognizes and destroys it.
  • Vaccines do not replace the immune system, do not directly destroy pathogens, and do not usually provide ready-made antibodies.

Therefore, vaccines protect by stimulating the immune system to recognise and fight specific pathogens.

Question 188

Which of the following is less effective in the depletion of stratospheric ozone?

  1. AOption (a)

    Methyl chloroform

  2. BOption (b)

    Chlorofluorocarbons

  3. COption (c)

    Halons  

  4. DOption (d)

    Hydrofluorocarbons

View answer & explanation

Correct answer

Answer: (d)D.

Hydrofluorocarbons

Why this answer is correct

CONCEPT:

Stratospheric Ozone Depletion

  • The stratospheric ozone layer protects Earth from harmful ultraviolet (UV) radiation.
  • Ozone depletion occurs due to substances that release chlorine or bromine radicals in the stratosphere.
  • These radicals catalytically destroy ozone molecules.

EXPLANATION:

  • Chlorofluorocarbons (CFCs), methyl chloroform, and halons contain chlorine or bromine atoms.
  • These atoms are released in the stratosphere and actively participate in ozone destruction reactions.
  • Hydrofluorocarbons (HFCs) contain fluorine but do not contain chlorine or bromine.
  • Therefore, HFCs do not significantly contribute to ozone depletion and are considered ozone-friendly alternatives.

Therefore, hydrofluorocarbons are the least effective in depleting stratospheric ozone.

Question 189

In the human eye, while contracting or relaxing vision _______ are responsible for changing the focal length of the human eye.

  1. AOption (a)

    cochlea

  2. BOption (b)

    ciliary muscles 

  3. COption (c)

     cornea 

  4. DOption (d)

    pupil 

View answer & explanation

Correct answer

Answer: (b)B.

ciliary muscles 

Why this answer is correct

CONCEPT:

Ciliary Muscles and Focal Length Adjustment

  • The human eye is a complex optical system that can adjust its focal length to focus on objects at varying distances.
  • This adjustment in the focal length is known as accommodation.
  • Ciliary muscles play a crucial role in this process by altering the shape of the lens.
  • When these muscles contract, the lens becomes thicker, increasing its curvature and allowing it to focus on nearby objects.
  • When these muscles relax, the lens becomes thinner, reducing its curvature and allowing it to focus on distant objects.

EXPLANATION:

  • The cochlea is part of the ear and has no role in vision.
  • The cornea is the transparent outer layer of the eye but does not change shape to adjust the focal length.
  • The pupil regulates the amount of light entering the eye but does not affect focal length.

​Therefore, the correct answer is: Option 2) Ciliary Muscles

Question 190

Which human activity significantly contributes to global warming?

  1. AOption (a)

    Utilising public transport

  2. BOption (b)

    Afforestation

  3. COption (c)

    Recycling processes 

  4. DOption (d)

    Combustion of fossil fuels

View answer & explanation

Correct answer

Answer: (d)D.

Combustion of fossil fuels

Why this answer is correct

CONCEPT:

Global Warming

  • Global warming refers to the gradual increase in the Earth’s average temperature.
  • It is mainly caused by the increase in greenhouse gases such as carbon dioxide, methane, and nitrous oxide.
  • These gases trap heat in the atmosphere, leading to the greenhouse effect.

EXPLANATION:

  • Combustion of fossil fuels such as coal, petrol, diesel, and natural gas releases large amounts of carbon dioxide into the atmosphere.
  • Carbon dioxide is a major greenhouse gas responsible for trapping heat and raising Earth’s temperature.
  • Utilising public transport, afforestation, and recycling processes help reduce greenhouse gas emissions and therefore do not contribute significantly to global warming.

Therefore, combustion of fossil fuels significantly contributes to global warming.

Teaching Methodology (10 questions)

Question 191

Which level of Bloom's Taxonomy is related to an objective that states, 'Students will be able to compare two historical events'?

  1. AOption (a)

    Evaluation

  2. BOption (b)

    Knowledge

  3. COption (c)

    Application

  4. DOption (d)

    Analysis

View answer & explanation

Correct answer

Answer: (d)D.

Analysis

Why this answer is correct

Bloom’s Taxonomy is a hierarchical framework used to classify educational objectives according to levels of cognitive complexity. It helps teachers frame learning outcomes that move from simple recall of facts to higher order thinking skills such as reasoning, comparison, and judgement. Each level reflects the type of mental process a learner is expected to perform.

Key Points

  • The objective “students will be able to compare two historical events” requires learners to examine similarities and differences between events.
  • This involves breaking information into parts, identifying relationships, and organizing ideas logically.
  • Such mental operations are central to the analysis level of Bloom’s Taxonomy. At this level, students go beyond remembering or using facts and instead engage in deeper thinking by examining structure and connections. Comparison is a key action verb associated with analysis because it demands understanding and interpretation.
  • Therefore, this objective clearly reflects analytical thinking rather than simple recall or use of knowledge.

Hint

  • Evaluation focuses on making judgements based on criteria and standards, such as justifying or critiquing, which goes beyond comparison.
  • Knowledge is concerned with recalling facts, dates, or definitions and does not involve examining relationships.
  • Application involves using learned information in new situations, such as solving problems, but does not require comparing ideas or events.

Hence, the correct answer is Analysis.

Question 192

Which of the following is important for developing early reading skills in children?

  1. AOption (a)

    Sitting quietly without interaction

  2. BOption (b)

    Repeated exposure to printed letters and words

  3. COption (c)

    Memorising multiplication tables

  4. DOption (d)

    Watching cartoons silently

View answer & explanation

Correct answer

Answer: (b)B.

Repeated exposure to printed letters and words

Why this answer is correct

Early reading skills form the foundation of a child’s overall language and literacy development. These skills develop gradually through meaningful interactions with print, sounds, and language in the early years.

Key Points

  • Young children learn to read through frequent interaction with print in meaningful contexts. Seeing letters and words again and again helps them recognise letter shapes, understand sound–symbol relationships, and build vocabulary.
  • This repeated exposure supports phonemic awareness and print awareness, which are foundational for early literacy development.
  • It also encourages curiosity and confidence in handling books and written material.

Hint

  • Sitting quietly without interaction does not promote language or literacy growth, as active engagement is essential for learning to read.
  • Memorising multiplication tables is related to numeracy rather than reading development.
  • Watching cartoons silently may provide entertainment but does not directly support print awareness or decoding skills.

Hence, the correct answer is repeated exposure to printed letters and words.

Question 193

By using open-ended exercises that require students to make their charts and models, what does a teacher hope to achieve?

  1. AOption (a)

    Active learning and creative thinking 

  2. BOption (b)

    Repeated memorisation and recall 

  3. COption (c)

    Observation and passive listening

  4. DOption (d)

    Strict adherence to textbook answers

View answer & explanation

Correct answer

Answer: (a)A.

Active learning and creative thinking 

Why this answer is correct

When a teacher uses open-ended exercises that ask students to create their own charts and models, the aim is to actively involve learners in the learning process.

 Key Points

  • Such activities encourage students to think independently, explore multiple possibilities, and express ideas in their own way.
  • Making charts and models requires understanding, organizing information, and applying imagination, which promotes deeper engagement with the content.
  • This approach helps learners construct knowledge rather than simply receive it, leading to better conceptual clarity and creativity.

 Hint

  • Repeated memorisation focuses only on recall and does not support higher-order thinking.
  • Observation and passive listening limit student participation and engagement.
  • Strict adherence to textbook answers restricts creativity and independent thought.

Hence, the correct answer is Active learning and creative thinking.

Question 194

Which type of discipline uses the knowledge of basic disciplines for practical applications? 

  1. AOption (a)

    Philosophical discipline 

  2. BOption (b)

    Applied discipline

  3. COption (c)

    Basic discipline

  4. DOption (d)

    Abstract discipline 

View answer & explanation

Correct answer

Answer: (b)B.

Applied discipline

Why this answer is correct

Disciplines of knowledge are broadly classified based on their purpose and nature. Some disciplines focus on developing theoretical understanding, while others are concerned with applying this knowledge to solve real life problems. 

 Key Points

  • An applied discipline focuses on using knowledge drawn from basic or foundational disciplines to solve real-life and practical problems.
  • It bridges theory and practice by taking concepts, principles, and findings from basic disciplines and applying them in specific fields such as education, engineering, medicine, or social work.
  • The emphasis is on usefulness, problem solving, and real-world application rather than only theoretical understanding.

 Hint

  • A philosophical discipline is concerned with reflection, values, and fundamental questions about knowledge and reality, not direct practical application.
  • A basic discipline aims at developing theoretical knowledge and principles without immediate concern for use.
  • An abstract discipline deals with ideas and concepts that are highly theoretical and not necessarily linked to practical situations.

Hence, the correct answer is Applied discipline.

Question 195

Which of the following best describes the concept of scaffolding in learning?

  1. AOption (a)

    Giving direct answers quickly to prevent frustration

  2. BOption (b)

    Letting children work completely alone without any guidance

  3. COption (c)

    Offering short-term help to complete slightly difficult tasks

  4. DOption (d)

    Using printed worksheets as the only learning method

View answer & explanation

Correct answer

Answer: (c)C.

Offering short-term help to complete slightly difficult tasks

Why this answer is correct

Scaffolding is an important concept in learning theory, especially associated with Vygotsky’s ideas on social interaction and the zone of proximal development. It refers to the support provided by a teacher or more capable peer to help learners accomplish tasks they cannot yet do independently. This support is gradually withdrawn as the learner gains confidence and competence.

Key Points

  • Scaffolding involves providing temporary and need-based assistance to learners when they face slightly challenging tasks.
  • The aim is to help students bridge the gap between what they already know and what they are trying to learn. Such support may include hints, prompts, guiding questions, or demonstrations.
  • As the learner becomes more capable, the teacher reduces this help step by step. This encourages independence while still ensuring successful learning. The idea is not to simplify the task completely, but to support learners just enough to move forward. This description directly reflects the essence of scaffolding in learning.

Hint

  • Giving direct answers immediately limits thinking and prevents learners from developing problem-solving skills.
  • Letting children work entirely without guidance ignores the supportive role of the teacher in learning.
  • Using only printed worksheets restricts interaction and does not provide adaptive support to learners.

Hence, the correct answer is Offering short-term help to complete slightly difficult tasks.

Question 196

Which learning theory emphasizes learning through stimulus-response associations?

  1. AOption (a)

    Behaviourism

  2. BOption (b)

    Constructivism

  3. COption (c)

    Cognitive

  4. DOption (d)

    Humanistic

View answer & explanation

Correct answer

Answer: (a)A.

Behaviourism

Why this answer is correct

Learning theories explain how individuals acquire new knowledge, skills, and behaviors. Each theory highlights different processes involved in learning, such as external influences, mental processes, or personal growth. Understanding these theories helps teachers choose appropriate teaching strategies and classroom practices.

Key Points

  • Behaviourism focuses on learning as a change in observable behaviour caused by interactions with the environment. It emphasizes the association between a stimulus and a response, where learning occurs through conditioning.
  • Reinforcement and punishment play a central role in strengthening or weakening these stimulus response connections. According to this view, internal mental processes are not the main concern.
  • What matters is how learners respond to external stimuli. Practice and repetition are used to form strong habits. This directly aligns with the idea of learning through stimulus response associations.

Hint

  • Constructivism views learning as an active process where learners construct knowledge based on experiences and prior understanding.
  • The cognitive theory emphasizes internal mental processes such as thinking, memory, and problem solving rather than stimulus response links.
  • The humanistic theory focuses on personal growth, self motivation, and emotional aspects of learning.

Hence, the correct answer is Behaviourism.

Question 197

Rubrics can help students learn by________________.

  1. AOption (a)

    only giving students grades 

  2. BOption (b)

    giving them feedback on their strengths and weaknesses

  3. COption (c)

    letting them grade themselves 

  4. DOption (d)

    not caring about creativity 

View answer & explanation

Correct answer

Answer: (b)B.

giving them feedback on their strengths and weaknesses

Why this answer is correct

Rubrics are structured assessment tools that clearly describe criteria and levels of performance for a task. They are widely used in education to support transparent assessment and to guide students toward better learning outcomes. Rubrics are not only evaluative tools but also instructional supports that help learners understand expectations.

Key Points

  • Rubrics help students learn by providing clear and specific feedback on their performance.
  • They show students what they have done well and where improvement is needed. By outlining strengths and weaknesses in relation to set criteria, rubrics guide learners on how to enhance their work.
  • This feedback supports self reflection and encourages continuous improvement. Students become more aware of quality standards and learning goals. In this way, rubrics actively contribute to learning rather than merely judging performance.

Hint

  • Only giving grades does not explain why a performance is good or weak and does not support learning.
  • Letting students grade themselves may support reflection but is not the primary purpose of rubrics.
  • Ignoring creativity contradicts the flexible and descriptive nature of rubrics, which can include creativity as a criterion.

Hence, the correct answer is giving them feedback on their strengths and weaknesses.

Question 198

________ is a system of society or government in which the father or the eldest male is the head of the family and descent is reckoned through the male line.

  1. AOption (a)

    Diarchy

  2. BOption (b)

    Matriarchy

  3. COption (c)

    Monarchy

  4. DOption (d)

    Patriarchy

View answer & explanation

Correct answer

Answer: (d)D.

Patriarchy

Why this answer is correct

Social systems are classified on the basis of authority, power relations, and lineage within families and societies. These systems shape roles, responsibilities, and inheritance patterns, and are important concepts in sociology and social science education.

Key Points

  • Patriarchy refers to a social system in which the father or the eldest male holds primary authority in the family.
  • In this system, power and decision making largely rest with men.
  • Descent, inheritance, and family name are traced through the male line. Social roles are defined in a way that gives men dominance in both family and societal structures.
  • This concept is commonly used to explain gender based power relations. The description given in the question clearly matches the meaning of patriarchy.

Hint

  • Diarchy refers to a system of dual rule where power is shared by two individuals or authorities.
  • Matriarchy is a social system in which women or mothers hold primary authority and descent is traced through the female line.
  • Monarchy is a form of government ruled by a king or queen, not a family lineage system.

Hence, the correct answer is Patriarchy.

Question 199

Which type of visual impairment, according to inclusive education standards, applies to a child who can see partially?

  1. AOption (a)

    Low vision within the blindness range

  2. BOption (b)

    Completely blind  

  3. COption (c)

    Fully sighted with a few minor problems

  4. DOption (d)

    Impaired hearing

View answer & explanation

Correct answer

Answer: (a)A.

Low vision within the blindness range

Why this answer is correct

Inclusive education recognizes that visual impairment exists on a continuum and not all children with visual difficulties are completely blind. Understanding different categories of visual impairment helps teachers plan appropriate support, accommodations, and learning materials for all learners in the classroom.

Key Points

  • A child who can see partially but has significant difficulty even after correction is described as having low vision.
  • According to inclusive education standards, such children are considered within the broader category of visual impairment and may fall within the blindness range for educational support.
  • They are able to use vision to some extent, often with aids, but still require adaptations such as large print, magnification, or special teaching strategies. Their partial sight can be used functionally for learning.

Hint

  • Completely blind refers to a total absence of functional vision, which does not apply to a child with partial sight.
  • Fully sighted with minor problems does not reflect significant visual impairment requiring educational support.
  • Impaired hearing relates to auditory difficulties and is unrelated to visual impairment.

Hence, the correct answer is Low vision within the blindness range.

Question 200

What is the advantage of being multilingual? 

  1. AOption (a)

    Communication is overly complicated

  2. BOption (b)

    An enormous volume of published documents is available

  3. COption (c)

    More employment options 

  4. DOption (d)

    Ancient texts are available

View answer & explanation

Correct answer

Answer: (c)C.

More employment options 

Why this answer is correct

Multilingualism refers to the ability to use more than one language for communication. In today’s interconnected world, knowing multiple languages is considered an important personal and social asset. It influences communication, cultural understanding, access to information, and opportunities in education and work.

Key Points

  • Being multilingual opens up wider employment opportunities in various fields such as education, tourism, international business, media, and public services.
  • Employers value multilingual individuals because they can communicate with diverse groups and work in multicultural environments. Knowledge of multiple languages enhances adaptability and mobility in the job market. It also supports professional growth in a globalized economy.
  • This practical benefit directly reflects an advantage of multilingualism.

Hint

  • Communication becoming overly complicated is a misconception rather than an advantage of multilingualism.
  • Availability of a large volume of published documents may be a benefit of literacy or scholarship, not necessarily multilingualism alone.
  • Access to ancient texts is a specialized advantage and does not apply broadly to multilingual ability.

Hence, the correct answer is More employment options.

200 questions in the full paper