Held in 2023
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In the given continuous pattern series some of the letters are missing. These missing letters are given in that order as one of the four alternatives below the series. Find out the
correct alternative.
CB _ AC _ CA _ BCAC _ _A
CBCBC
CACBC
CBCBA
CCBBC
Correct answer
CBCBC
Why this answer is correct
The logic follows,
CBCA / CBCA / CBCA / CBCA
Hence, the correct answer is "Option 1"
Six boys M, N, O, P, Q and R are sitting in a circle facing the centre. 'M' and 'O' are sitting together and also 'P' and 'R' are sitting together. ‘R’ is sitting to the left of 'Q'. There are two boys sitting between 'M' and ‘Q. ‘N’ is sitting left to 'O'. Who is sitting in between 'P' and 'O' ?
N
M
R
Q
Correct answer
M
Why this answer is correct
Given
Six boys, M, N, O, P, Q and R are sitting in a circle facing the center.
The Final Arrangement
M is sitting in between 'P' and 'O'
Hence, the correct answer is "Option 2"
Five girls R, P, S, T and Q are sitting in a row facing towards North but not in the same order. 'P' is sitting to the left of 'R' and 'Q' is sitting to the right of 'T' and left of 'P', 'R' is sitting to the left of 'S. Who is sitting in the middle?
R
Q
P
S
Correct answer
P
Why this answer is correct
**Given :**Five girls R, P, S, T and Q are sitting in a row facing towards North but not in the same order.
Hence, the correct answer is "Option 3"
Samir walks 5 meters towards East. He then turns towards his right and walks 10 meters more. After that he turns right again and walks around 10 meters. Then he takes opposite turn and walks 5 meters. Which direction is he facing now ?
North
East
South
West
Correct answer
East
Why this answer is correct
Hence, the correct answer is "Option 2"
If triangle represents men, rectangle represents educated, circle represents employed and square represents married then identify the number that represents the men who are educated and employed but not married.
3
9
5
8
Correct answer
5
Why this answer is correct
The number that represents the men who are educated and employed but not married is in the shaded portion.
Hence, the correct answer is "Option 3"
Two statements are given below and they are 6. labelled as Assertion (A) and Reason (R).
Assertion (A) : Organic matter is important for crops.
Reason (R) : Organic matter liberates minerals in the soil.
Select correct answer with the help of code:
Both (A) and (R) are true and (R) is correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true but (R) is false.
(A) is false but (R) is true.
Correct answer
Both (A) and (R) are true and (R) is correct explanation of (A).
Why this answer is correct
Hence, the correct answer is "Option 1".
Given below is a question followed by two statements numbered I and II, each containing some information. Decide which of the statement(s) is / are sufficient to answer the question?
What is the difference in the age of 'F' and 'E' ?
Statement I : 'E' is 10 years younger than 'T'.
Statement II : 'T' is 5 years older than 'F'.
The statement I alone is sufficient to answer the question while the statement II alone is not sufficient to answer the question.
The statement II alone is sufficient to answer the question while the data in statement I alone is not sufficient to answer the question.
Both statements I and II together are necessary to answer the question.
Either the statement I alone or statement II alone is sufficient to answer the question.
Correct answer
Both statements I and II together are necessary to answer the question.
Why this answer is correct
By combining these statements, we can calculate the age difference between E and F:
Hence, the correct answer is "Option 3".
A statement showing relationship between 18. different elements is given, followed by two conclusions, I and II. Assuming the statement to be true, find out which of the conclusions is / are definitely true.
Statement : F ≥ I < N ≤ G = E < R
Conclusions
I : E > F
II : R > I
Only conclusion I is true.
Only conclusion II is true.
Both conclusions I and II are true.
Neither conclusion I nor conclusion II is true.
Correct answer
Only conclusion II is true.
Why this answer is correct
**Given
Statements:
** F ≥ I < N ≤ G = E < R
Conclusions
I : E > F - False (Their is no relation establish between E and F. Hence, It is False)
II : R > I - True (I < N ≤ G = E < R, I <R,R>I. Hence, it is True)
Only conclusion II is true.
Hence, the correct answer is "Option 2"
Pointing towards a gentleman, Sonia said, "His only daughter is the sister of my Son's father." How is the gentleman related to Sonia ?
Husband
Father-in-law
Brother
Brother-in-law
Correct answer
Father-in-law
Why this answer is correct
Given :
"The sister of my son's father" is the sister of Sonia's husband.
"His only daughter is the sister of my son's father." This means the gentleman's only daughter is the sister of Sonia's husband
Symbol representation:
The family tree diagram is shown below:
Hence, the correct answer is "Option 2"
.
R's father is the only son of 'B' and brother of 'P'. 'A' is the daughter of 'B' and sister of 'Q'. How is P related to Q ?
Brother
Niece
Nephew
Sister
Correct answer
Sister
Why this answer is correct
Symbol representation:
The family tree diagram is shown below
Hence, the correct answer is "Option 4"
Identify the diagram that best represents the relationship among acids, bases and chemicals.
Correct answer
Why this answer is correct
The diagram that best represents the relationship among them acids, bases, and chemicals. is shown below:
Hence, the correct answer is "Option 2 "
Six students of class-X A, B, C, D, E and F have different heights. 'D' is shorter than only three students. F is taller than A but shorter than E. A is taller than D. B is not the shortest in the group. Who is the tallest student?
B
A
F
E
Correct answer
E
Why this answer is correct
Given :-
Hence, the correct answer is "Option 4"
Two statements are given below, followed by two conclusions numbered I and II. Assuming the statements to be true even if they seem to be at variance from commonly known facts, decide which of the given conclusion(s) logically follow (s) from the given statements.
Statements :
Conclusions :
I. Some tables are Almirahs.
II. No table is Almirah.
Only conclusion I follows.
Only conclusion II follows.
Both conclusions I and II follow.
Either conclusion I or conclusion II follows.
Correct answer
Either conclusion I or conclusion II follows.
Why this answer is correct
The least possible Venn diagram for the given statements is as shown below :
Conclusions:
I. Some tables are Almirahs. - False (Their is no direction relation between Tables and Almirah as it possible but not definte)
II. No table is Almirah. - False(Their is no direction relation between Tables and Almirah as it possible but not definte)
But this is a Either - Or case.
Conditions of Either-or case:
The two complementary pairs are:
2) No + Some
Hence, the correct answer is "Option 4"
A girl is facing East. She turns 225° in the anticlockwise direction and then 135° in the clockwise direction. Which direction is she facing now ?
West
North
North-West
North-East
Correct answer
North
Why this answer is correct
A girl is facing east. She turns 135° in clockwise direction. Further she turns another 225° in anticlockwise direction.
Hence, the correct answer is "Option 2 "
Select the term that replaces the question mark (?) and complete the given series.
4M3, 607, 8Q13, ?, 12U31, 14W43
10S15
10R21
10S21
8R15
Correct answer
10S21
Why this answer is correct
The logic follows,
Table show alphabet serial number –
Hence, the correct answer is "Option 3"
Which of the following wildlife sanctuaries was notified as a tiger reserve in October, 2022?
Kamlang Tiger Reserve
Satyamangalam Tiger Reserve
Srivilliputhur Megamalai Tiger Reserve
Ranipur Tiger Reserve
Correct answer
Ranipur Tiger Reserve
Why this answer is correct
The correct answer is Ranipur Tiger Reserve.
Key Points
Additional Information
Important Points
What is the World Health Organization (WHO) norm regarding the Doctor Population ratio?
1 ∶ 100
1 ∶ 500
1 ∶ 1000
1 ∶ 2000
Correct answer
1 ∶ 1000
Why this answer is correct
The correct answer is 1 ∶ 1000.
Key Points
Additional Information
Important Points
A magnet exerting a force on another magnet is an example of ________.
Contact Force
Non-Contact Force
Electrostatic Force
Gravitational Force
Correct answer
Non-Contact Force
Why this answer is correct
The correct answer is Non-Contact Force.
Key Points
Additional Information
Important Points
As per the Economic Survey of India 2022-23, the maximum percentage of schools in India have, which of the following facilities according to the 2021-22 statistics?
Girls Toilets
Boys Toilets
Libraries
Computers
Correct answer
Girls Toilets
Why this answer is correct
The correct answer is Girls Toilets.
Key Points
Additional Information
Important Points
Whose decision is considered to be final in case a question arises with regard to the disqualification of a member of the Parliament according to the grounds mentioned in the Constitution?
The President
The Speaker of the Lok Sabha
The Chief Election Commissioner of India
The joint sitting of the Speaker of the Lok Sabha and the Chairman of the Rajya Sabha
Correct answer
The President
Why this answer is correct
The correct answer is The President.
Key Points
Additional Information
Important Points
Among the following which planet has the largest number of moons?
Mercury
Venus
Mars
Saturn
Correct answer
Saturn
Why this answer is correct
The correct answer is Saturn.
Key Points
Additional Information
Important Points
Which of the following countries won all gold medals in under - 15 and under - 19 categories in the South Asian Youth Table Tennis Championship - 2023?
Bangladesh
India
Maldives
Sri Lanka
Correct answer
India
Why this answer is correct
The correct answer is India.
Key Points
Additional Information
Important Points
Which of the following pairs of the country and its official currency is/are matched correctly ?
| (a) | Bhutan | Ngultrum |
|---|---|---|
| (b) | Austria | Euro |
| (c) | Ghana | Cedi |
| (d) | Argentina | Real |
Choose the correct answer from the codes below :
Only (a ) and (b)
Only (b)
Only (a), (b) and (c)
Only (b) and (d)
Correct answer
Only (a), (b) and (c)
Why this answer is correct
The correct answer is Only (a), (b), and (c).
Key Points
Additional Information
Important Points
Who among the following is the author of the book 'Poverty and Un-British Rule in India' which offered a criticism of the British Rule in India for its economic impact?
A.O. Hume
Annie Besant
Badruddin Tyabji
Dadabhai Naoroji
Correct answer
Dadabhai Naoroji
Why this answer is correct
The correct answer is Dadabhai Naoroji.
Key Points
Additional Information
Important Points
What percentage of the earth's water is fit for human use?
Only 70%
Only 30%
Only 2.7%
Less than 1%
Correct answer
Less than 1%
Why this answer is correct
The correct answer is Less than 1%.
Key Points
Additional Information
Important Points
Which of the following Fundamental Right(s) is/are guaranteed also to the non-citizens by the Indian Constitution?
(a) right to freedom of speech and expression
(b) right to life and personal liberty
(c) right to assemble peacefully and without arms
Choose the correct answer from the codes below :
Only (a)
Only (b)
Only (a) and (c)
Only (a) and (b)
Correct answer
Only (b)
Why this answer is correct
The correct answer is Only (b).
Key Points
Additional Information
Which of the following fuel has the highest calorific value ?
Petrol
Methane
LPG
Hydrogen
Correct answer
Hydrogen
Why this answer is correct
The correct answer is Hydrogen.
Key Points
Additional Information
Important Points
Which film won the Academy Award for the Best Documentary Short Film at the 95th Academy Awards?
The Elephant Whisperers
An Irish Goodbye
Women Talking
Top Gun
Correct answer
The Elephant Whisperers
Why this answer is correct
The correct answer is The Elephant Whisperers.
Key Points
Additional Information
Important Points
As per the National Education Policy (NEP) 2020, which age group is covered under the New Pedagogical and Curriculum Structure of School education?
3 to 16 years
3 to 17 years
3 to 18 years
4 to 16 years
Correct answer
3 to 18 years
Why this answer is correct
The correct answer is 3 to 18 years.
Key Points
Additional Information
Important Points
Among the following states of India which state has the highest proportion of children in class I to VII who take paid tuition classes (in all rural schools) as per the Annual Status of Education (ASER) 2022 ?
Rajasthan
Kerala
Gujarat
West Bengal
Correct answer
West Bengal
Why this answer is correct
The correct answer is West Bengal.
Key Points
Additional Information
Read the passage given below and answer the questions that follow.
While engaged in the laying of a new railway line, I had a miraculous escape from an awful death. I lived in a small township, but my work lay some twelve miles away, and I had a small tent on the works yet I often went to the town on horseback.
On one occasion, an accident happening to my horse, I got a lift into town, hoping that someone might do me a similar favour on my way back. But this was not to be, and I made up my mind to do the journey on foot, shortening the distance by taking a cut through the hills which would save me about six miles.
To take this shortcut, it was necessary to cross an ostrich 'camp' or farm. To venture across these camps in the breeding season, especially on foot, can be dangerous, for during this time the male birds are extremely ferocious.
He generally slept in:
a train coach
a staff quarter
a tented accommodation
the waiting room
Correct answer
a tented accommodation
Why this answer is correct
The correct answer is 'Option 3'.
Key Points
Therefore, the correct answer is Option 3: a tented accommodation.
Additional Information
'To venture across an ostrich farm ______'
The underlined word can be correctly replaced with:
dare
go
travel
move
Correct answer
dare
Why this answer is correct
The correct answer is: Option 1 i.e. dare.
Key Points
Therefore, the correct answer is: dare.
Additional Information
Here are the other options explained along with their meanings and example sentences:
The narrator was working in the railways
a train driver
an engineer
a guard
a ticket collector
Correct answer
an engineer
Why this answer is correct
The correct answer is 'Option 2'.
Key Points
Therefore, the correct answer is Option 2.
Additional Information
Study the following statements.
(A) Male ostriches are ferocious by nature.
(B) To pass through ostrich farms can dangerous.
(A) is an opinion and (B) is a fact.
(B) is an opinion and (A) is a fact.
Both (A) and (B) are true.
Both (A) and (B) are false.
Correct answer
(A) is an opinion and (B) is a fact.
Why this answer is correct
The correct answer is 'Option 1'.
Key Points
Therefore, the correct answer is Option 1: (A) is an opinion and (B) is a fact.
Additional Information
Once he had to travel to the town:
on foot
on horseback
getting a lift
on a local train
Correct answer
getting a lift
Why this answer is correct
The correct answer is 'Option 3'.
Key Points
Therefore, the correct answer is Option 3.
Additional Information
Complete the sentences given below with the help of options that follow each sentence.
Ram along with Shyam ________ expected to come.
is
are
were
have been
Correct answer
is
Why this answer is correct
The correct answer is Option 1 i.e 'is'.
Key Points
Therefore, the correct answer is- Option 1.
Additional Information
Complete the sentences given below with the help of options that follow each sentence.
I ________ the playground to reach the river bank.
cut into
cut away
cut through
cut down
Correct answer
cut through
Why this answer is correct
The correct answer is Option 3 i.e 'cut through'.
Key Points
Therefore, the correct answer is- Option 3.
Additional Information
Complete the sentences given below with the help of options that follow each sentence.
The new phone _______ the competition.
blows off
blows away
blows over
blows out
Correct answer
blows away
Why this answer is correct
The correct answer is Option 2 i.e 'blows away'.
Key Points
Therefore, the correct answer is- Option 2.
Additional Information
Complete the sentences given below with the help of options that follow each sentence.
She _______ when I entered the hall.
has sung
is singing
was singing
have sung
Correct answer
was singing
Why this answer is correct
The correct answer is Option 3 i.e 'was singing'.
Key Points
Therefore, the correct answer is- Option 3.
Additional Information
Complete the sentences given below with the help of options that follow each sentence.
Ram is _______ same boy that I liked most.
a
an
the
no article
Correct answer
the
Why this answer is correct
The correct answer is Option 3 i.e 'the'.
Key Points
Therefore, the correct answer is- Option 3.
Additional Information
Which of the underlined parts of the following sentence is incorrect ?
He had hinted (A) that (B) he (C) wants (D) money.
(B)
(C)
(D)
(A)
Correct answer
(D)
Why this answer is correct
The correct answer is Option 3.
Key Points
Therefore, the correct answer is Option 3.
Correct Sentence: "He had hinted that he wanted money."
Additional Information
Choose the option in which the following words/phrases can be arranged to form a correct sentence.
(A) may live
(B) eat so
(C) we
(D) that we
(B), (D), (A), (C)
(A), (C), (B), (D)
(C), (B), (D), (A)
(D), (A), (C), (B)
Correct answer
(C), (B), (D), (A)
Why this answer is correct
The correct answer is Option (3) i.e. we eat so that we may live
Key Points
Therefore, the correct answer is Option (3): C-B-D-A.
Additional Information
Choose the option in which the given sentence has been changed into passive voice.
I wrote a letter.
A letter is written by me.
A letter was written by me.
A letter has been written by me.
A letter had been written by me.
Correct answer
A letter was written by me.
Why this answer is correct
The correct answer is Option 2.
Key Points
Therefore, the correct answer is Option 2.
Correct Sentence: "A letter was written by me."
Additional Information
His views do not accord with mine.
Which one of the following words is opposite in meaning to the underlined word?
agree
correspond
clash
coincide
Correct answer
clash
Why this answer is correct
The correct answer is: Option 3 i.e. Clash.
Key Points
Therefore, the correct answer is: Clash.
Additional Information
Here are the other options explained along with their Hindi meanings and example sentences:
The law will punish whosoever is guilty.
Which of the following words can replace the underlined word?
innocent
culpable
impudent
audacious
Correct answer
culpable
Why this answer is correct
The correct answer is: Option 2 i.e. culpable.
Key Points
Therefore, the correct answer is: culpable.
Additional Information
Here are the other options explained along with their Hindi meanings and example sentences:
निम्नलिखित गद्यांश को ध्यानपूर्वक पढ़कर उस पर आधारित प्रश्नों के सटीक उत्तर दीजिए :
भारत में अनेक विदेशी जातियाँ आयीं लेकिन भारतीय संस्कृति ने अपने विकास की प्रक्रिया में इन सभी को आत्मसात कर लिया। भारतीय संस्कृति ने अन्य संस्कृतियों के अच्छे गुणों को आत्मसात करके उन्हें अपने रंग रूप में ढाल लिया । विदेशी संस्कृतियों के अच्छे गुण आज भारतीय संस्कृति के अभिन्न अंग हैं। भारत ने उत्तम विचार, आचार-व्यवहार और सद्गुणों को ग्रहण करके भारतीय संस्कृति में समाविष्ट कर लिया है। भारतीय संस्कृति कालजयी बन चुकी है। अनेकता में एकता भारतीय संस्कृति की विशिष्टता रही है। भारत में संसार के लगभग सभी धर्म मिल जाते हैं।
निम्नलिखित में से भारतीय संस्कृति की विशेषता नहीं है :
कालजयी होना
समाविष्ट करना
आत्मसात करना
सद्गुणों का निष्कासन
Correct answer
सद्गुणों का निष्कासन
Why this answer is correct
इस प्रश्न का सही उत्तर "सद्गुणों का निष्कासन" है।
Key Points
गद्यांश के अनुसार ,
Additional Information अन्य विकल्प:
कालजयी होना -
समाविष्ट करना -
आत्मसात करना -
भारतीय संस्कृति ने अपने विकास की प्रक्रिया में आत्मसात कर लिया :
प्राचीन ग्रंथों को
विदेशी जातियों को
वेदों को
परंपराओं को
Correct answer
विदेशी जातियों को
Why this answer is correct
इसका सही उत्तर "विदेशी जातियों" है।
Key Points
गद्यांश के अनुसार ,
Additional Information अन्य विकल्प:
प्राचीन ग्रंथों -
वेदों -
परंपराओं को -
भारत में विदेशी जातियों के आगमन से क्या हुआ ?
भारतीय संस्कृति में प्राचीनता आ गयी।
भारतीय संस्कृति ने सभी को आत्मसात कर लिया।
भारतीय जातियों के साथ उनका टकराव हुआ।
विदेशी संस्कृतियाँ ही प्रभावित हुई।
Correct answer
भारतीय संस्कृति ने सभी को आत्मसात कर लिया।
Why this answer is correct
इसका सही उत्तर "भारतीय संस्कृति ने सभी को आत्मसात कर लिया" है।
Key Points
गद्यांश के अनुसार ,
Additional Information अन्य विकल्प:
भारतीय संस्कृति में प्राचीनता आ गयी -
भारतीय जातियों के साथ उनका टकराव हुआ -
विदेशी संस्कृतियाँ ही प्रभावित हुई -
भारतीय संस्कृति के अभिन्न अंग हैं :
विदेशी विचार
विदेशी जातियाँ
विदेशी संस्कृतियों की बुराइयाँ
विदेशी संस्कृतियों के अच्छे गुण
Correct answer
विदेशी संस्कृतियों के अच्छे गुण
Why this answer is correct
इसका सही उत्तर "विदेशी संस्कृतियों के अच्छे गुण" है।
Key Points
गद्यांश के अनुसार ,
Additional Information अन्य विकल्प:
विदेशी विचार -
विदेशी जातियाँ -
विदेशी संस्कृतियों की बुराइयाँ -
भारतीय संस्कृति में समाविष्ट नहीं हुआ :
आचार-व्यवहार
उत्तम विचार
सद्गुण
अराजकता
Correct answer
अराजकता
Why this answer is correct
इसका सही उत्तर ""अराजकता" है।
Key Points
गद्यांश के अनुसार ,
Additional Information अन्य विकल्प:
आचार-व्यवहार -
उत्तम विचार -
सद्गुण -
निम्नलिखित में वर्तनी की दृष्टि से शुद्ध शब्द है :
उज्जवल
उज्ज्वल
उज्वल
उजवल
Correct answer
उज्ज्वल
Why this answer is correct
वर्तनी की दृष्टि से शुद्ध शब्द है- उज्ज्वल
Key Points
Important Points
Additional Information
| अशुद्ध | शुद्ध |
|---|---|
| ऊत्थान | उत्थान |
| तृकोण | त्रिकोण |
| केबिनेट | कैबिनेट |
| न्यौछावर | न्योछावर |
| लछमन | लक्ष्मण |
| जुवती | युवती |
| घनिष्ट | घनिष्ठ |
'चारु चंद्र की चंचल किरणें खेल रही थीं जल-थल' प्रस्तुत काव्य पंक्ति में अलंकार है-
यमक
अनुप्रास
उपमा
श्लेष
Correct answer
अनुप्रास
Why this answer is correct
सही उत्तर है - ‘अनुप्रास’।
Key Pointsअन्य विकल्प:
उपमेय या उपमान के साधर्म्य का आरोप करके और दोंनों भेदों का अभाव दिखाते हुए उपमेय या उपमान के रूप में ही वर्णन किया जाता है।
इसके सांग रूपक, अभेद रुपक, तद्रूप रूपक, न्यून रूपक, परम्परित रूपक आदि अनेक भेद हैं।
'अवसर के अनुकूल बदल जाने वाले' के लिए एक शब्द है :
चालाक
अवसरवादी
अवसरानुकूल
लालची
Correct answer
चालाक
Why this answer is correct
'अवसर के अनुकूल बदल जाने वाले' इस वाक्यांश के लिए सार्थक शब्द है- चालाक
Key Points
Important Pointsअन्य विकल्प -
| वाक्यांश | शब्द |
|---|---|
| उपयुक्त अवसर से लाभ उठानेवाला | अवसरवादी |
| अवसर के अनुरूप | अवसरानुकूल |
| लोभी होना | लालची |
Additional Information
कुछ महत्वपूर्ण वाक्यांश के लिए एक शब्द -
| वाक्यांश | शब्द |
|---|---|
| जहाँ तक सध सके | यथासाध्य |
| जिसका मन महान हो | महामना |
| जो धर्म या शास्त्र के विरुद्ध हो | अधर्म |
| जो चंद्र धारण करता हो | चन्द्रधारी |
| दूसरों के दोषों को खोजना | छिद्रान्वेषण |
| जिसके पाणि में (हाथ) वीणा हो | वीणापाणि |
| जो राज्य या राजा से द्रोह करे | राजद्रोही |
निम्नलिखित में व्यंजन संधि वाला शब्द नहीं है :
दिग्गज
दिगंबर
स्वागत
सद्गुण
Correct answer
दिगंबर
Why this answer is correct
व्यंजन संधि वाला शब्द नहीं है- दिगंबर
Key Points
विश्लेषण-
| विकल्प | शब्द | संधि प्रकार | कारण |
|---|---|---|---|
| 1 | दिग्गज | व्यंजन | दिक् + गज → ग् → ग्ग (द्वित्व) |
| 2 | दिगंबर | नहीं | दिक् + अंबर → क् → ग (विसर्ग → ग्); विसर्ग संधि |
| 3 | स्वागत | व्यंजन | सु + आगत → उ → व (गुण) + आ → आ |
| 4 | सद्गुण | व्यंजन | सत् + गुण → त् → द्ग (द्वंद्व) |
'अपना हाथ जगन्नाथ' लोकोक्ति का निम्नलिखित में से सटीक अर्थ है :
स्वावलंबी होना चाहिए।
खुद में आत्मनिर्भरता होती है।
किसी अन्य का किया काम पसंद नहीं आता है।
अपने हाथ में ही ईश्वर है।
Correct answer
स्वावलंबी होना चाहिए।
Why this answer is correct
सही उत्तर है- स्वावलंबी होना चाहिए।
Key Points
Important Points
| लोकोक्ति | अर्थ | वाक्य |
|---|---|---|
| अकेला चना भाड नही फोड़ सकता | अकेला व्यक्ति कुछ भी नहीं कर सकता। | मैं जानता हूँ कि ‘अकेला चना भाड़ नहीं फोड़ सकता’ फिर भी जो काम अपने करने का है, वह जरूर करूँगा। |
| अंधे की लकड़ी | बेसहारे का सहारा। | राजकुमार पिता की अंधे की लकड़ी है। |
| अक्ल बड़ी कि भैंस | शारीरिक बल से बौद्धिक बल अच्छा होता है। | तुम्हारे इस काम को देखकर मुझे अक्ल बड़ी की भैंस वाली कहावत याद आ गई। |
Additional Information
| लोकोक्ति परिभाषा | उदाहरण |
|---|---|
| लोकोक्ति का शाब्दिक अर्थ ‘लोक में प्रचलित उक्ति’ है। जब कोई पूर्य कथन किसी प्रसंग विशेष में उद्धृत किया जाता है तो उसे लोकोक्ति कहते हैं। | अपनी करनी पर उतरनी अर्थात किए का फल भोगना। वाक्य- एक छोटी सी चोरी के कारण वह आज तक जेल में पश्चचाताप कर रहा है, अपनी करनी पार उतरनी। |
निम्नलिखित में 'स्त्री' शब्द का पर्यायवाची नहीं है :
दारा
नारी
कांता
कामिनी
Correct answer
दारा
Why this answer is correct
सही उत्तर है- दारा
Key Points
Important Points
Additional Informationकुछ अन्य महत्वपूर्ण पर्यायवाची शब्द:-
| शब्द | पर्यायवाची शब्द |
|---|---|
| भ्रमर | मधुप, अलि, भौंरा, भृंग, मधुकर, द्विरेफ, मिलिंद। |
| देव | देवता, अमर, वसु, आदित्य, निर्जर, त्रिदश, गीर्वाण। |
| हवा | पवन, वायु, समीर, अनिल, वात, मरुत्, बयार, प्रकंपन। |
| साँप | सर्प, नाग, विषधर, व्याल, भुजंग, उरग, अहि पन्नग। |
| गृह | घर, निकेतन, भवन, आलय, निवास, आवास, निलय। |
| दानव | दैत्य, राक्षस, निशाचर, दनुज, यातुधान, निशिचर। |
| घोड़ा | अश्व, घोटक, तुरंग, तुरग, बाजि, वाजि, सैंधव, हय। |
'आमरण' में समास है :
अव्ययीभाव
तत्पुरुष
कर्मधारय
द्वन्द्व
Correct answer
अव्ययीभाव
Why this answer is correct
सही उत्तर है - "अव्ययीभाव" l
Key Points
Additional Information
निम्नलिखित में अशुद्ध वाक्य है:
लड़कियाँ गीत गा रही थीं।
उसने अनेक पुस्तकें लिखीं।
चार आदमी के लिए खाना बना है।
प्रत्येक देश के प्रतिनिधि आए थे।
Correct answer
चार आदमी के लिए खाना बना है।
Why this answer is correct
अशुद्ध वाक्य है- चार आदमी के लिए खाना बना है।
Key Pointsसही वाक्य होगा-
Important Points
Additional Informationवर्तनी संबंधी अशुद्धियाँ -
| अशुद्ध वाक्य | शुद्ध वाक्य |
|---|---|
| मेले में विद्यार्थियों की कई टोलीयाँ थीं। | मेले में विद्यार्थियों की कई टोलियाँ थीं। |
| गुलाम की एक माला खरीद लेना। | गुलाब की माला खरीद लेना। |
| सहित्य और संस्कृती का गहरा संबंध हैं। | साहित्य और संस्कृति का गहरा संबंध हैं। |
| यह आपकी अनाधिकार चेष्टा हैं। | यह आपकी अनधिकार चेष्टा हैं। |
| उसे पैत्रिक संपत्ति में हिस्सा नहीं मिला। | उसे पैतृक संपत्ति में हिस्सा नहीं मिला। |
'हथियार डालना' मुहावरे का सटीक अर्थ है :
पराजय स्वीकार करना
हार जाना
परास्त हो जाना
पराजित कर देना
Correct answer
पराजय स्वीकार करना
Why this answer is correct
'हथियार डाल देना' मुहावरे का सही अर्थ है- पराजय स्वीकार करना
Key Points
| मुहावरा | अर्थ | वाक्य प्रयोग |
|---|---|---|
| हथियार डाल देना | पराजय स्वीकार करना | दुश्मन सेना का गोला बारूद खत्म हो गया तो सेना ने हथियार डाल दिए |
Important Points
| मुहावरा | अर्थ | वाक्य प्रयोग |
|---|---|---|
| धाक जमाना | प्रभाव ज़माना | उसके आने से इस स्कूल में अनुशासन की धाक जम गई है। |
| आनंदित होना | खुश होना | उसने मुझे उपहार दिया, तो मैं बहुत खुश हुआ। |
Additional Information
| मुहावरा | उदाहरण |
|---|---|
| मुहावरा का शाब्दिक अर्थ 'अभ्यास' है। मुहावरा शब्द अरबी भाषा का शब्द है। हिंदी में ऐसे वाक्यांशों को मुहावरा कहा जाता है। जो अपने साधारण अर्थ को छोड़कर विशेष अर्थ को व्यक्त क��ते हैं। | अपनी खिचड़ी अलग पकाना-अर्थ- सबसे पृथक् काम करना। वाक्य प्रयोग-वह अपनी खिचड़ी अलग पकाता है |
निम्नलिखित में असंगत विलोमार्थी शब्द-युग्म है :
ताप - संताप
पाप - पुण्य
तीव्र - मंद
निंदा - स्तुति
Correct answer
ताप - संताप
Why this answer is correct
असंगत विलोमार्थी शब्द युग्म है- ताप - संताप
Key Points
Additional Informationकुछ अन्य महत्वपूर्ण विलोम शब्द -
| शब्द | विलोम |
|---|---|
| बहिरंग | अंतरंग |
| मधुर | कर्कश |
| अधीन | अनधीन |
| उन्नति | अवनति |
| दुराचारी | सदाचारी |
| जंगम | स्थावर |
| प्रत्यक्ष | परोक्ष |
| एकांगी | सर्वांगीण |
| उदयाचल | अस्ताचल |
What is the boiling point of water in degree Celsius ?
0°C
100°C
273°C
373°C
Correct answer
100°C
Why this answer is correct
CONCEPT:
Boiling Point of Water
EXPLANATION:
Therefore, the boiling point of water at standard atmospheric pressure is 100°C.
For a fire caused by short circuiting of an electric circuit, what should not be done?
Throw water in the area.
Throw dry sand in the area.
Switch off the main electric supply.
Use a fire-extinguisher.
Correct answer
Throw water in the area.
Why this answer is correct
CONCEPT:
Fire Caused by Short Circuiting of an Electric Circuit
EXPLANATION:
Therefore, the correct answer is: Throw water in the area should not be done.
Which of the following is an example of a flammable liquid?
Water
Ethanol
Salt solution
Vinegar
Correct answer
Ethanol
Why this answer is correct
CONCEPT:
Flammable Liquids
EXPLANATION:
Therefore, the correct answer is: Option 2) Ethanol.
When KMnO4 reacts with oxalic acid, \(\mathrm{MnO}_{4}^{-}\) is reduced to Mn2+ and \(\mathrm{C}_{2} \mathrm{O}_{4}^{2-}\) is oxidized to CO2. Hence, 5 mL of 0.02 M KMnO4 is equivalent to :
10 mL of 0.05 M oxalic acid
5 mL of 0.05 M oxalic acid
2.5 mL of 0.2 M oxalic acid
5 mL of 0.1 M oxalic acid
Correct answer
5 mL of 0.05 M oxalic acid
Why this answer is correct
CONCEPT:
Reaction Between KMnO4 and Oxalic Acid
2 MnO4- + 5 C2O42- + 16 H+ → 2 Mn2+ + 10 CO2 + 8 H2O
EXPLANATION:
Moles = Molarity × Volume (in liters)
= 0.02 × 0.005 = 0.0001 moles
Moles of oxalic acid = (5/2) × Moles of KMnO4
= (5/2) × 0.0001 = 0.00025 moles
Moles = Molarity × Volume (in liters)
Volume = Moles / Molarity
= 0.00025 / 0.05 = 0.005 L = 5 mL
Hence, 5 mL of 0.02 M KMnO4 is equivalent to 5 mL of 0.05 M oxalic acid.
Assertion (A) : For preparing sodium hydroxide solution, use borosilicate glass (e.g. Pyrex) free of scratches, chips or breaks.
Reason (R) : If you use a different type of glass, there is a chance the temperature change could cause it to shatter.
Both (A) and (R) are true, and (R) is the correct explanation of (A).
Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(A) is true, but (R) is false.
(A) is false, but (R) is true.
Correct answer
Both (A) and (R) are true, and (R) is the correct explanation of (A).
Why this answer is correct
CONCEPT:
Glassware and Chemical Reactions
EXPLANATION:
Both (A) and (R) are true, and (R) is the correct explanation of (A).
A plane mirror is arranged horizontally. A ray of light is incident on its centre from a fixed source at an angle of 45°. The mirror is rotated about its centre anticlockwise by 10°. The reflected ray is rotated ______ by _______.
clockwise, 10°
clockwise, 20°
anti-clockwise, 10°
anti-clockwise, 20°
Correct answer
anti-clockwise, 20°
Why this answer is correct
CONCEPT:
Reflection of light from a plane mirror
EXPLANATION:
Therefore, the reflected ray is rotated anticlockwise by 20°.
A sharp image of a distant object is obtained on a screen by using a convex lens. To determine the focal length of the lens, you need to measure the distance between the:
lens and object.
lens and screen.
object and screen.
both (2) and (3).
Correct answer
lens and screen.
Why this answer is correct
CONCEPT:
Focal Length of a Convex Lens
1/f = 1/v - 1/u
where:
EXPLANATION:
Therefore, the correct answer is Lens and screen.
Chlorophyll is a naturally occurring chelate compound in which the central metal atom is :
copper
magnesium
iron
calcium
Correct answer
magnesium
Why this answer is correct
CONCEPT:
Chlorophyll Structure
EXPLANATION:
Therefore, the correct answer is Magnesium.
What is the standard unit of mass?
Kilogram
Litre
Metre
Second
Correct answer
Kilogram
Why this answer is correct
CONCEPT:
Standard Unit of Mass
EXPLANATION:
Therefore, the correct answer is Kilogram.
Potassium permanganate is used for purifying drinking water, because :
it is a sterilizing agent.
it dissolves the impurities of water.
it is a reducing agent.
it is an oxidizing agent.
Correct answer
it is an oxidizing agent.
Why this answer is correct
CONCEPT:
Oxidizing Agent
EXPLANATION:
Therefore, the correct answer is it is an oxidizing agent.
What is the function of a stopwatch in a physics experiment ?
To measure temperature.
To determine volume.
To record time intervals.
To analyze data patterns.
Correct answer
To record time intervals.
Why this answer is correct
CONCEPT:
Stopwatch and its use in Physics Experiments
EXPLANATION:
Correct Answer: Option 3 - To record time intervals.
The main buffer system of the human blood is:
\(\mathrm{H}_{2} \mathrm{CO}_{3}-\mathrm{HCO}_{3}^{-}\)
\(\mathrm{H}_{2} \mathrm{CO}_{3}-\mathrm{CO}_{3}^{2-}\)
CH3COOH-CH3COO-
NH2CONH2-NH2CONH+
Correct answer
\(\mathrm{H}_{2} \mathrm{CO}_{3}-\mathrm{HCO}_{3}^{-}\)
Why this answer is correct
CONCEPT:
Buffer Systems in Human Blood
EXPLANATION:
H2CO3 ⇌ HCO3- + H+
Therefore, the main buffer system of the human blood is H2CO3-HCO3-.
What are the essential safety requirements of a science laboratory?
(A) Eye-wash station.
(B) Proper storage space for chemicals.
(C) At least two entrance / exit gates.
(D) Electrical sockets near the sink.
(B) and (C) only
(A) and (B) only
(A), (B) and (C) only
(A), (C) and (D) only
Correct answer
(A), (B) and (C) only
Why this answer is correct
CONCEPT:
Essential Safety Requirements of a Science Laboratory
EXPLANATION:
Hence, the essential safety requirements of a science laboratory are an eye-wash station, proper storage space for chemicals, and at least two entrance/exit gates.
An ammeter has 20 divisions between Mark 0 and Mark 2 on its scale. The least count of the ammeter is:
0.02 A
0.01 A
0.2 A
0.1 A
Correct answer
0.1 A
Why this answer is correct
CONCEPT:
Least Count of an Ammeter
Least Count = (Range of the Scale) / (Number of Divisions)
EXPLANATION:
Therefore, the least count of the ammeter is 0.1 A.
In fireworks, the green flame is produced because of :
sodium
barium
mercury
potassium
Correct answer
barium
Why this answer is correct
CONCEPT:
Green Flame in Fireworks
EXPLANATION:
Therefore, the correct option is: Option 2) Barium.
When an iron nail gets rusted, iron oxide is formed:
without any change in the weight of the nail.
with decrease in the weight of the nail.
with increase in the weight of the nail.
without any change in colour or weight of the nail.
Correct answer
with increase in the weight of the nail.
Why this answer is correct
CONCEPT:
Rusting of Iron
EXPLANATION:
The weight of the nail increases because rust is heavier than the original iron due to the added oxygen and water molecules.
Which laboratory apparatus is used for measuring volume of liquids?
Beaker
Graduated cylinder
Test tube
Bunsen burner
Correct answer
Graduated cylinder
Why this answer is correct
CONCEPT:
Measuring Volume of Liquids
EXPLANATION:
Therefore, the correct answer is: Graduated cylinder.
What are soaps ?
Salts of silicates.
Mixtures of glycerol and alcohols.
Sodium or potassium salts of heavier fatty acids.
Esters of heavy fatty acids.
Correct answer
Sodium or potassium salts of heavier fatty acids.
Why this answer is correct
CONCEPT:
Soaps
EXPLANATION:
Therefore, the correct answer is Sodium or potassium salts of heavier fatty acids.
Which of the following statements best explains why only sulphuric acid is commonly used in redox reactions, while HCI and HNO3 are not preferred ?
Sulphuric acid is a strong reducing agent, making it ideal for redox reactions.
HCl and HNO3 are not suitable for redox reactions due to their weak acid properties.
Sulphuric acid acts as both an j oxidizing and reducing agent, providing versatility in redox reactions.
HCI and HNO3 are highly reactive acids that may interfere with the desired redox reaction.
Correct answer
HCI and HNO3 are highly reactive acids that may interfere with the desired redox reaction.
Why this answer is correct
CONCEPT:
Usage of Acids in Redox Reactions
EXPLANATION:
So, the correct answer is HCl and HNO3 are highly reactive acids that may interfere with the desired redox reaction.
What are the duties of a lab attendant?
(A) To assist the teacher with experiments.
(B) To maintain the lab equipment and supplies.
(C) To provide safety training to the students.
Choose the correct answer :
(B) only
(A) and (B) only
(A) and (C) only
(A), (B) and (C)
Correct answer
(A) and (B) only
Why this answer is correct
CONCEPT:
Duties of a Lab Attendant
EXPLANATION:
So, the correct answer is (A) and (B) only
The rate at which a solid dissolves cannot be increased by :
Pulverizing or grinding up the solid to increase the surface area of the solid in contact with the liquid.
Heating the solvent to increase the rate of solution because the molecules of both the solvent and the solute will move faster.
Stirring vigorously.
Adding more of the solid.
Correct answer
Adding more of the solid.
Why this answer is correct
CONCEPT:
The rate at which a solid dissolves in a liquid
EXPLANATION:
Therefore, the correct answer is Adding more of the solid.
What does the term "pH" mean ?
Electrical conductivity
Temperature
Acidity or alkalinity
Optical density
Correct answer
Acidity or alkalinity
Why this answer is correct
Here is the HTML code based on your input, explaining the concept of pH and its meaning:
CONCEPT:
pH (Potential of Hydrogen)
EXPLANATION:
pH = -log[H+]
Therefore, the term "pH" means the measure of acidity or alkalinity of a solution.
Fires caused by burning of oil cannot be extinguished with water. Why is this so?
Because oil will dissolve in water and keep on burning.
Because reaction between oil and water releases enough heat to provide the ignition temperature of oil.
Because oil, being insoluble in water and lighter than it, will float on water and continue burning.
Because the ignition temperature of oil is very low and it will keep burning even when water is poured on it.
Correct answer
Because oil, being insoluble in water and lighter than it, will float on water and continue burning.
Why this answer is correct
CONCEPT:
Why oil fires cannot be extinguished with water
Oil is insoluble in water and lighter than water.
Since oil remains exposed to air, it continues to burn.
EXPLANATION:
Therefore, the correct answer is Because oil, being insoluble in water and lighter than it, will float on water and continue burning.
Which of the following acids (A-D) along with its appropriate salt should be used to prepare a buffer with a pH of 4.5 ?
A, Ka = 1 × 10-3
B, Ka = 2.9 × 10-4
C, Ka = 1.8 × 10-5
D, Ka = 2.3 × 10-9
Correct answer
C, Ka = 1.8 × 10-5
Why this answer is correct
CONCEPT:
Buffer and Henderson-Hasselbalch Equation
pH = pKa + log10([A-] / [HA])
where:
EXPLANATION:
pKa = -log10(Ka)
Therefore, the appropriate acid to prepare a buffer with a pH of 4.5 is Ka = 1.8 × 10-5.
Which of the following is an example of a chemical reaction ?
Boiling water
Dissolving sugar in water
Burning wood
Crushing a can
Correct answer
Burning wood
Why this answer is correct
CONCEPT:
Chemical Reaction:
EXPLANATION:
Therefore, the correct answer is Burning wood, as it involves a chemical reaction that produces new substances.
A sample of concentrated H2SO4 is 95% H2SO4 by weight and its density is 1.8 g/mL. How many ml. of this acid are required to prepare 1 L of a 1N solution of this acid?
14.3 mL
28.7 mL
35.7 mL
57.3 mL
Correct answer
28.7 mL
Why this answer is correct
CONCEPT:
Normality and Dilution Principle
N = (Weight of solute × Basicity or n-factor) / (Molar mass of solute × Volume of solution in liters)
EXPLANATION:
Therefore, approximately 28.7 mL of the concentrated H2SO4 solution is required to prepare 1 L of 1N solution.
Which substance is correctly matched with its storage container ?
Organic solvents, metal
Acids, metal
Hydrofluoric acid, glass
Bromine, dark coloured glass
Correct answer
Bromine, dark coloured glass
Why this answer is correct
CONCEPT:
Proper Storage of Chemicals
EXPLANATION:
The correct answer is Bromine, dark-colored glass.
Which of these is a primary standard oxidizing agent in a redox titration ?
K2Cr2O7
Mohr's salt
KMnO4
Oxalic acid
Correct answer
KMnO4
Why this answer is correct
CONCEPT:
Primary Standard Oxidizing Agent
EXPLANATION:
Therefore, the correct answer is KMnO4.
What is the process of separating a mixture of liquids into its individual components by using the differences in boiling points called?
Distillation
Decantation
Filtration
Evaporation
Correct answer
Distillation
Why this answer is correct
CONCEPT:
Distillation
EXPLANATION:
Therefore, the correct answer is Distillation.
What is the purpose of a bio-safety cabinet ?
To provide a safe place to work with biological agents.
To remove fumes from the air.
To provide a place to store biological agents.
To conduct experiments requiring high temperature.
Correct answer
To provide a safe place to work with biological agents.
Why this answer is correct
CONCEPT:
Bio-Safety Cabinet
EXPLANATION:
Therefore, the correct answer is To provide a safe place to work with biological agents.
What should not be done if a student accidentally inhales SO2 gas ?
The victim should be taken at once to an open area.
Let the student breathe deeply.
Let the student inhale ammonia vapours.
The student should be given fruit juice or lemon juice to drink.
Correct answer
Let the student breathe deeply.
Why this answer is correct
CONCEPT:
Safety Measures for SO2 Gas Inhalation
EXPLANATION:
Therefore, the action that should not be done is: Let the student breathe deeply.
What is the chemical symbol for sodium ?
Na
So
N
K
Correct answer
Na
Why this answer is correct
CONCEPT:
Chemical Symbol for Elements
EXPLANATION:
So, the correct Answer: Option 1) Na
What is the SI unit of electric current ?
Volt
Ampere
Watt
Ohm
Correct answer
Ampere
Why this answer is correct
CONCEPT:
SI Unit of Electric Current
EXPLANATION:
Therefore, the SI unit of electric current is the ampere (A).
What should a lab attendant do if they spill a chemical?
Immediately clean up the spill
Report the spill to the lab technician / teacher incharge
Both (1) and (2)
None of the above
Correct answer
Both (1) and (2)
Why this answer is correct
CONCEPT:
Handling Chemical Spills in a Lab
EXPLANATION:
Therefore, the correct answer is Both (1) and (2).
Which gas is used during photosynthesis?
Carbon dioxide
Oxygen
Nitrogen
Methane
Correct answer
Carbon dioxide
Why this answer is correct
CONCEPT:
Photosynthesis
6CO2 + 6H2O + sunlight → C6H12O6 + 6O2
EXPLANATION:
Therefore, the gas used during photosynthesis is carbon dioxide (CO2).
What does the term "flammable" mean?
Easily broken down by heat.
Capable of conducting electricity.
Producing a strong odour.
Capable of catching fire.
Correct answer
Capable of catching fire.
Why this answer is correct
The correct answer is option (4).
CONCEPT:
Flammability
EXPLANATION:
Therefore, the term "flammable" means capable of catching fire.
Which instrument is used to measure the mass of an object ?
Graduated cylinder
Thermometer
Balance
Bunsen burner
Correct answer
Balance
Why this answer is correct
CONCEPT:
Instrument Used to Measure Mass
EXPLANATION:
Therefore, the appropriate instrument for measuring mass is the balance.
What is the most common type of fire extinguisher used in the laboratory?
Water
Foam
Carbon dioxide
Dry powder
Correct answer
Carbon dioxide
Why this answer is correct
CONCEPT:
Fire Extinguishers in Laboratories
EXPLANATION:
Therefore, the most common type of fire extinguisher used in laboratories is the Carbon Dioxide (CO2) extinguisher.
Sodium metal is kept under:
Petrol
Alcohol
Water
Kerosene
Correct answer
Kerosene
Why this answer is correct
CONCEPT:
Storage of Sodium Metal
EXPLANATION:
Therefore, the correct answer is Kerosene.
Which lab equipment is used to hold test tubes during heating ?
Pair of tongs
Tripod stand
Clamp
Holder
Correct answer
Holder
Why this answer is correct
CONCEPT:
Lab Equipment for Holding Test Tubes During Heating
EXPLANATION:
Additional Information
What is the pH value of a neutral solution ?
7
10
1
14
Correct answer
7
Why this answer is correct
EXPLANATION:
pH of a Neutral Solution
pH = -log[H+]
pH = -log(1 × 10-7)
pH = 7
Therefore, the pH value of a neutral solution is 7.
What is the correct way to prepare 100 ml of ~ 1.0 M hydrochloric acid solution (MM = 36.5 g/mol)?
Weigh 36.5g of HCl and dissolve it in 100 mL of distilled water.
Add 8.3mL of conc. HCI (~12 M) to 100 mL of distilled water.
Add 8.3 mL of conc. HCI (~12 M) to ~ 50 mL of distilled water, stir and make up the volume to 100 mL with distilled water.
Add 91.7 mL of distilled water to 8.3 mL of conc. HCI.
Correct answer
Add 8.3 mL of conc. HCI (~12 M) to ~ 50 mL of distilled water, stir and make up the volume to 100 mL with distilled water.
Why this answer is correct
CONCEPT:
Preparation of a dilute acid solution
M1V1 = M2V2
V1 = (M2V2) / M1
V1 = (1.0 × 0.1) / 12
V1 = 0.0083 L = 8.3 mL
EXPLANATION:
Therefore, the correct answer is Add 8.3 mL of conc. HCl (~12 M) to ~50 mL of distilled water, stir and make up the volume to 100 mL with distilled water.
What is the purpose of a fume hood ?
(A) To provide a safe place to work with chemicals.
(B) To remove fumes from the air.
(C) To provide a place to store chemicals.
(D) To conduct experiments requiring high temperature.
(A) and (B) only
(A) and (C) only
(B) and (D) only
(A), (B) and (D) only
Correct answer
(A) and (B) only
Why this answer is correct
CONCEPT:
Purpose of a Fume Hood
EXPLANATION:
Additional Information
Therefore, the correct options are (A) and (B) only.
Which of the following is an example of a corrosive substance ?
Sugar
Salt
Hydrochloric acid
Water
Correct answer
Hydrochloric acid
Why this answer is correct
CONCEPT:
Corrosive Substance
EXPLANATION:
Hydrochloric acid stands out as the correct answer because it is a strong acid that can cause chemical burns and corrode various materials.
Therefore, the correct answer is Hydrochloric acid.
You need to prepare 40 mL of a 0.15 M glucose solution by taking some of a 0.80 M stock solution and diluting it to 40 mL. What volume of the stock solution do you need?
5.3 mL
6.0 mL
7.5 mL
12 M
Correct answer
6.0 mL
Why this answer is correct
CONCEPT:
Solution Dilution Formula
C1V1 = C2V2
EXPLANATION:
C1V1 = C2V2
0.80 × V1 = 0.15 × 40
V1 = (0.15 × 40) / 0.80
V1 = 6.0 mL
Therefore, the volume of the stock solution needed is 6.0 mL.
Which of the following titrations is possible using phenolphthalein as an indicator?
Acetic acid with pyridine
Oxalic acid With NaOH
Hydrochloric acid with aniline
Sulphuric acid with aqueous ammonia
Correct answer
Oxalic acid With NaOH
Why this answer is correct
CONCEPT:
Phenolphthalein as an Indicator
EXPLANATION:
So, the correct answer is The only suitable titration is Oxalic acid with NaOH (Option 2).
When ice converts into water:
temperature is increased
heat is absorbed
heat is released
temperature is decreased
Correct answer
heat is absorbed
Why this answer is correct
CONCEPT:
When ice converts into water
EXPLANATION:
Additional Information
Therefore, the correct answer is Option 2: Heat is absorbed.
Which of the following laboratory safety equipments is used to extinguish small fires?
Safety goggles
Fire extinguisher
Laboratory apron
Blanket
Correct answer
Fire extinguisher
Why this answer is correct
CONCEPT:
Laboratory Safety Equipment to Extinguish Small Fires
EXPLANATION:
Therefore, the correct answer is Option 2: Fire extinguisher.
What is the approximate normality of dilute acids in a science laboratory?
1N
2N
4N
8N
Correct answer
1N
Why this answer is correct
CONCEPT:
Normality of Dilute Acids
EXPLANATION:
Equivalent weight = Molar mass / Basicity (for acids)
Therefore, the approximate normality of dilute acids in a science laboratory is 1N.
For burns caused by steam or hot water, the affected part should be washed with:
cold running water
ice
dilute NaHCO3
dilute acetic acid
Correct answer
cold running water
Why this answer is correct
CONCEPT:
First Aid for Burns
EXPLANATION:
Additional Information
Therefore, the correct answer is Cold running water.
What is the purpose of using a control group in a biology experiment ?
To provide a basis for comparison.
To represent a larger population.
To test multiple variables simultaneously.
To ensure safety during the experiment.
Correct answer
To provide a basis for comparison.
Why this answer is correct
CONCEPT:
Control Group in Biology Experiments
EXPLANATION:
Therefore, the correct answer is To provide a basis for comparison.
When sodium bicarbonate powder is added to acetic acid, a gas evolves. Which one of the following statements is NOT true for this gas ?
It turns lime water milky.
It extinguishes a burning splinter.
It dissolves in a solution of sodium hydroxide.
It turns acidified potassium dichromate solution green.
Correct answer
It turns acidified potassium dichromate solution green.
Why this answer is correct
CONCEPT:
Reaction Between Sodium Bicarbonate and Acetic Acid
NaHCO3 + CH3COOH → CH3COONa + H2O + CO2(gas)
EXPLANATION:
The statement "It turns acidified potassium dichromate solution green" is NOT true for the gas evolved when sodium bicarbonate reacts with acetic acid.
Which of the following is not a safety precaution in a laboratory ?
Wearing gloves
Wearing safety.goggles
Wearing a lab coat
Eating and drinking in the lab
Correct answer
Eating and drinking in the lab
Why this answer is correct
CONCEPT:
Safety Precautions in a Laboratory
EXPLANATION:
So, the correct answer is Avoid eating and drinking in the lab to maintain a safe and contamination-free working environment.
Washing soda is the common name for:
Sodium carbonate
Calcium bicarbonate
Sodium bicarbonate
Calcium carbonate
Correct answer
Sodium carbonate
Why this answer is correct
CONCEPT:
Washing Soda (Sodium Carbonate)
EXPLANATION:
Therefore, the correct answer is Sodium carbonate.
Aqueous solutions of the sulphate salts of three metals X, Y and Z are kept in three separate beakers. It is found that X reacts with both YSO4 and ZSO4 solutions, whereas Z reacts only with YSO4 solution. Which of the following is the correct order of reactivity of the three metals?
Y > Z > X
X > Z > Y
X > Y > Z
Z > Y > X
Correct answer
X > Z > Y
Why this answer is correct
CONCEPT:
Reactivity Series of Metals
EXPLANATION:
Thus, the correct order of reactivity is X > Z > Y
Assertion (A) : For preparing sulphuric acid solution, always add the acid to water very slowly while stirring vigorously.
Reason (R) : A great amount of heat is liberated when sulphuric acid is added to water.
Both (A) and (R) are true, and (R) is the correct explanation of (A).
Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(A) is true, but (R) is false.
(A) is false, but (R) is true.
Correct answer
Both (A) and (R) are true, and (R) is the correct explanation of (A).
Why this answer is correct
CONCEPT:
Handling Sulphuric Acid Safely
EXPLANATION:
Option 1) Both (A) and (R) are true, and (R) is the correct explanation of (A).
Which gas is the most abundant in the Earth's atmosphere?
Oxygen
Nitrogen
Carbon dioxide
Argon
Correct answer
Nitrogen
Why this answer is correct
CONCEPT:
Composition of Earth's Atmosphere
EXPLANATION:
Therefore, the most abundant gas in the Earth's atmosphere is Nitrogen.
Soda water contains :
Citric acid
Sulphuric acid
Carbon dioxide
Nitrous acid
Correct answer
Carbon dioxide
Why this answer is correct
CONCEPT:
Soda Water and Carbon Dioxide
EXPLANATION:
Therefore, the correct answer is Carbon dioxide.
Read the following passage and answer the questions:
A solution of hydrochloric acid with a concentration of approximately 0.1 mol dm⁻³ was prepared. Before any class could use this solution for an experiment, a technician standardized the hydrochloric acid solution with sodium carbonate. The technician dissolved 1.06 grams of anhydrous sodium carbonate in water to make a 100 mL solution. A 100 mL portion of the sodium carbonate solution was transferred to a conical flask. Three drops of an indicator were added, and the solution was titrated with the hydrochloric acid.
What is a possible titre value of the titration ?
10.6 mL
9.5 mL
15.2 mL
21.1 mL
Correct answer
10.6 mL
Why this answer is correct
CONCEPT:
Titration and Titre Value
EXPLANATION:
Therefore, a possible titre value for the titration is 10.6 mL.
Which of the following combinations of indicator and colour change is correct?
Methyl orange, orange to yellow
Phenolphthalein, pink to colourless
Methyl orange, yellow to pink
Phenolphthalein, colourless to pink
Correct answer
Phenolphthalein, pink to colourless
Why this answer is correct
CONCEPT:
Indicators and Colour Changes
EXPLANATION:
Therefore, the correct answer is Phenolphthalein, pink to colourless.
120 questions in the full paper