SSC CHSL Previous Paper 30 (Held On: 17 March 2018 Shift 1) (Previous Year Paper)

Here the correct answer is Megalomaniac.

Key Points:-

• 'Megalomania' comes from the Greek 'megas'(great) and 'mania'(madness).
• It is a madness of greatness, but not a great kind of madness!
• Let's look at the meaning and correct spelling of the given word:-
• Megalomaniac*(noun)* -a person who has an obsessive desire for power.
• For Example -He has been accused of being a megalomaniac.

Therefore, the correct spelling of the given word is Megalomaniac.

Here the correct answer is BCA.

Key Points:- 

• 'Enable' means give the authority (to).
• For Example - The above-named acts enable the Board of Trade to take all the necessary steps to ensure that the safety of passenger trains is sufficiently guarded.
• Something enables you to do something.
• 'To' follows naturally.
• Thus, B has to be first. Rule out option 2 and option 4.
• A sentence can't end with how you.
• Thus, C cannot be the last sentence.
• Therefore, it is clear from the above conclusions that the correct sequence is BCA.

Correct Sentence - A lever enabled you to raise or lower the wicks and this is how you controlled the burner flame.**

Here the correct answer is Had arrived.

Key Points:-

• In the above given sentence, 'had arrived' will be used.
• It is so because the arrival happened before the well and the lamp became redundant.
• Whenever two actions occur in the past, one after the other, then the first action is expressed in past perfect tense and the second action is expressed in Simple past tense.
• For Examples:-
• The patient had died before the doctor came.
• He came after she had gone.
• Past perfect tense is used to express an action which has been completed a long time ago in the past.
• Structure of past perfect tense - Subject + had + V3 + Object.

Therefore, the correct sentence is By then running water and electricity had arrived, making the well and the lamp post redundant.

Here the correct answer is No improvement.

Key Points

• ​The original sentence, "This stove had a flat kerosene tank at the bottom," is in the past tense and uses the verb "had" correctly.
• The use of "had" indicates that the stove possessed a flat kerosene tank in the past.
• Let's examine the options:
• "have": This option changes the tense from past to present. However, the sentence is describing a specific stove in the past, so the present tense is not appropriate.
• "have had": This option uses a present perfect tense, which indicates an action that started in the past and continues into the present. However, the sentence does not suggest an ongoing action; it simply describes the stove's feature in the past. Therefore, the present perfect tense is not suitable here.
• "has had": This option uses a present perfect tense with the third-person singular subject "has." Similar to option 2, it suggests an ongoing action that does not align with the intended meaning of the sentence. The sentence refers to a specific stove in the past, so the present perfect tense is not appropriate.
• "no improvement": This option states that no improvement is necessary, indicating that the original verb "had" is correct. Since the sentence correctly uses the past tense to describe the stove's feature in the past, no change is required.
• Therefore, the correct answer is "no improvement" (option 4) as the original sentence is already grammatically correct.
  

Therefore, the correct sentence is This stove had a flat kerosene tank at the bottom.

Here the correct answer is Bask.

Key Points:-

• Let's look at the meaning of the correct answer:-
• Bask*(verb) -* revel in and make the most of (something pleasing).
• For Example - He went on basking in the glory of his first book.
• Synonyms - revel, luxuriate, delight, wallow
• Antonyms - unlike, disapprove, dislike, different
• Let's look at the meaning of the other options:-

Therefore, the correct one word for the given descriptive sentence is Bask.

Here the correct answer is Harrowing.

Key Points:-

• Let's look at the meaning of the correct answer:-
• Harrowing*(adjective)* - acutely distressing.
• For Example - It was a harrowing film about racism and violence.
• Let's look at the meaning of the other options:-

Therefore, the correct one word for the given words/sentence is Harrowing.

Here the correct answer is In an alliance or partnership with.

Key Points

• Let's look at the meaning of the idiom/phrase:-
• 'In cahoots with' - In an alliance or partnership with  OR  working together or making plans together in secret.
• For Example - I think those two are in cahoots.
• Therefore, the correct meaning of the given idiom/phrase is In an alliance or partnership with.

Here the correct answer is Used to indicate that an idea has been unsuccessful and that a new one must be devised.

Key Points:-

• Let's look at the meaning of the correct answer:-
• Back to the drawing board - to start over
• For Example - The company went back to the drawing board to make a better product.

Therefore, the correct meaning of the given idiom/phrase is Used to indicate that an idea has been unsuccessful and that a new one must be devised.

Here the correct answer is Brightness.

Key Points:-

• In the above given blank, 'brightness' will be used.
• It is so because the sentence is talking about a quality or state of the sun.
• Therefore, a noun will be used in the blank.
• Brightness*(noun) -* the quality or state of giving out or reflecting light.
• For Example - We can change the brightness of the bulb.

Therefore, the correct word for the blank is Brightness.

Here the correct answer is To.

Key Points:-

• In the above given blank, 'to' will be used.
• It is so because 'Time to time' is a phrase meaning sometimes, but not regularly.
• For Example - I still think of her from time to time.
• In the sentence, the speaker is talking about the weather which can be fascinating sometimes, but not regularly.

Therefore, the correct word for the blank is To.

Here the correct answer is From.

Key Points:-

• In the above given blank, 'from' will be used.
• The sentence aims to say that besides the mental trauma, the ritual causes other things too.
• 'Aside from' is a phrase which means apart from; besides.
• For Example -The room was empty apart from one man seated beside the fire.

Therefore, the correct word for the blank is From.

Here the correct answer is Human.

Key Points:-

• In the above given blank, 'human' will be used.
• Ostentatious*(adjective) -* characterized by pretentious or showy display; designed to impress.
• For Example - He prepared a simple design that is glamorous without being ostentatious.
• Clearly, the blank must also contain an adjective so that both of these can describe society.
• Human*(adjective) -* relating to or characteristic of humankind.
• For Example - The human body is made up of 206 bones.
• The other options i.e. humanity, humanly and humanely are noun, adjective and adjective respectively.
• Therefore, 'human' will be used which is both a noun and an adjective.

Therefore, the correct word for the blank is Human.

Here the correct answer is Basic.

Key Points:-

• In the above given blank, 'basic' will be used.
• It is so because  the blank must be filled with an adjective which is supposed to describe conversation starter.
• In the options given, only basic and base are adjectives.
• The other two i.e. basically and basics are adverb and noun respectively.
• 'Basic' will be used because it is an adjective meaning
• forming an essential foundation or starting point; fundamental.
• For Example - Certain basic rules must be obeyed.
• 'Base' cannot be used because it means without moral principles; ignoble.
• For Example - The electorate's baser instincts of greed and selfishness.
• Thus, 'basic' fits in the context of the sentence.

Therefore, the correct word for the blank will be Basic.

Here the correct answer is Acquaintance.

Key Points:-

• The root of acquaintance is the Old French word 'acointier', a verb meaning 'make known'.
• Being the acquaintance of a person or topic means that you know something about it.
• Let's look at the correct spelling and meaning of the given word:-
• Acquaintance*(noun) -*knowledge or experience of something  OR  a person one knows slightly, but who is not a close friend.
• For Examples:-
• The pupils had little acquaintance with the language.
• A wide circle of friends and acquaintances accompanied him.

Therefore, the correct spelling of the given word is Acquaintance.

Here the correct answer is She proposed that they should wait for the seat.

Key Points:-

• 'Let us' shows a suggestion.
• In transition of speech, we use should to express suggestion.
• Let's look at the steps for changing the sentence from direct to indirect speech:
• The reporting verb 'said' is changed to 'proposed' because 'In Exclamatory sentences that express (grief, sorrow, happiness, applaud),  interjections are removed and the sentence is changed to an assertive sentence'.
• The pronoun 'us' is changed to 'they' as the first person changes according to subject.
• The conjunction 'that' is used in place of the comma and the inverted comma are removed.

Therefore, the correct indirect speech will be She proposed that they should wait for the seat.

Additional Information

The following table will enable us to know how tense changes in indirect speech:-

Here the correct sentence is Reward can be achieved by hard work.

Key Points:-

• Modals such as can, should, might, could, may, will, shall, ought to etc. are preserved during change of voice.
• Whenever a sentence in active voice contains a modal verb, it is changed according to the following structure:-
• Active Voice - Modal verb + V₁
• Passive Voice - Modal verb + be + V3
• For Example:-
• Active Voice - I may solve this sum.
• Passive Voice - This sum may be solved by me.
• Simple present (achieve) changes to simple past (achieved).
• The subject and object positions are interchanged.
• Since the subject of the active sentence is 'one' i.e. an indefinite subject, it can be eliminated from the passive sentence.

Therefore, the correct passive voice will be  Reward can be achieved by hard work.

Additional Information

• When we convert active voice to passive voice, three things need to be kept in mind:-
• Change object into subject.
• Change subject into object.
• Always use third form of verb in passive voice.
• Use 'by' before the new object.

Here the correct answer is RQP.

Key Points:-

• 'By' at the end of the given starting sentence suggests that there will be the name of the scientist who invented turbine as the first sentence.
• The second sentence will be Q because the first sentence R contains incomplete name of the second scientist.

Therefore, the correct order will be RQP.

Here the correct answer is Impure.

Key Points:-

• Let's look at the meaning of the given word:-
• Wholesome*(adjective) -* conducive to or suggestive of good health and physical well-being.
• For Example - The food is plentiful and very wholesome.
• Let's look at the meaning of the correct answer:-
• Impure*(adjective) -* mixed with foreign matter; adulterated.
• For Example - It was an impure form of gold.
• Let's look at the meaning of the other options:-

Therefore, the correct antonym of the given word is Impure.

Additional Information

Let's look at the synonym and antonyms of the given word and that of the correct answer:-

Here the correct answer is Underwhelm.

Key Points:-

• Let's look at the meaning of the given word:-
• Inundate*(verb)* - overwhelm (someone) with things or people to be dealt with.
• For Example - We've been inundated with complaints from listeners.
• Let's look at the meaning of the correct answer:-
• Underwhelm*(verb)* - fail to impress or make a positive impact on (someone); disappoint.
• For Example - Investors seemed underwhelmed by the company's turnaround plan.
• Let's look at the meaning of the other options:-

Therefore, the correct antonym of the given word is Underwhelm.

Additional Information

Let's look at the synonym and antonym of the given word and answer:- 

Here the correct answer is Consent.

Key Points:-

• Let's look at the meaning of the given word:-
• Accede*(verb) -* agree to a demand, request, or treaty.
• For Example - The authorities did not accede to the strikers' demands.
• Let's look at the meaning of the correct answer:- 
• Consent*(verb)* - permission for something to happen or agreement to do something.
• For Example - No change may be made without the consent of all the partners.
• Let's look at the meaning of the other options:-

Therefore, the correct synonym of the given word is Consent.

Additional Information

Let's look at the synonyms and antonyms of the given word and the correct answer:-

Here the correct answer is Tired.

Key Points:-

• Let's look at the meaning of the given word:-
• Hackneyed*(adjective) -* (of a phrase or idea) having been overused; unoriginal and trite.
• For Example - Some hackneyed situations come across as fresh and funny.
• Let's look at the meaning of the correct answer:-
• Tired(adjective) - in need of sleep or rest; weary.
• For Example - Fisher rubbed his tired eyes.
• Let's look at the meaning of the other options:-

Therefore, the correct synonym of the given word is Tired.

Additional Information

Let's look at the synonyms and antonyms of the given word and the correct answer:-

Here the correct answer is No matter.

Key Points:-

• In the above given sentence, 'no matter' will be used.
• It is so because the person doesn't care how many times his landlord berates him, he is not going to pay the rent.
• No matter is a phrase meaning regardless of; irrespective of.
• For Example - No matter what the excuse, you must not be late.
• Therefore, 'no matter' will be apt for the given sentence.

Thus, the correct sentence is He won’t pay the rent  no matter how many times his landlord berates him.

Here the correct answer is Had done.

Key Points:-

• In the above given sentence, 'had done' will be used.
• Whenever two actions occur in the past, one after the other, then the first action is expressed in past perfect tense and the second action is expressed in Simple past tense.
• For Examples:-
• The patient had died before the doctor came.
• He came after she had gone.
• Structure of past perfect tense - Subject + had + V3 + Object.
• It is so because the action of doing the work was completed before the action of him coming.
• Therefore, 'past perfect tense' will be used.
  

Thus, the correct sentence is Anita had done her work by the time he came.

​

Hinglish

• ऊपर दिए गए वाक्य में 'had done' का प्रयोग होगा।
• जब भी भूतकाल में दो क्रियाएं होती हैं, एक के बाद एक, तो पहली क्रिया past perfect tense में व्यक्त होती है और दूसरी क्रिया simple past tense में व्यक्त होती है।
• उदाहरण के लिए:-
• The patient had died before the doctor came.
• He came after she had gone.
• Past perfect tense की संरचना - Subject + had + V3 + Object.
• ऐसा इसलिए है क्योंकि उसके आने से पहले काम करने की क्रिया पूरी हो गई थी।
• अतः 'past perfect tense' का प्रयोग होगा।
  

इस प्रकार, सही वाक्य यह है Anita had done her work by the time he came.

Here the correct answer is 2.

Key Points:-

• In the above given sentence, the error is in part 2.
• It is so because in place of 'blocking', there should be a noun which is described by building.
• 'Blocking' is a verb which has been wrongly used in place of blocks.
• Therefore, 'blocking' will be replaced by 'blocks'.

Thus, the correct sentence is Proteins are providers of energy in an emergency, and are primarily used as building blocks for growth and repair of many body tissues.

Here the correct answer is C.

Key Points:-

• In the above given sentence, the error is in part C.
• It is so because 'than' has been wrongly used in place of 'then'.
• 'Than' is used for comparison (more than; faster than, etc.)
• For Example - She is younger than I am.
• 'Then' is  used to represent time. In the given context: afterwards.
• For Example - She said something and then rode ahead.
• Therefore, 'than' will be replaced by 'then'.

Thus, the correct sentence is He cooked  dinner and then turned the radio on.

Just as Shout is of higher intensity than speak, rage is of higher intensity than anger.

Hence, answer is option Rage : Anger.

The pattern followed here is:

46 + 2 = 48

Same pattern will be followed for 61 : ?

61 + 2 = 63

Hence, answer is 63.

The pattern followed here is:

V – 3 = S

O – 3 = L

T – 3 = Q

The same pattern will be followed for HRX : ?

H – 3 = E

R – 3 = O

X – 3 = U

Hence, the correct answer is EOU.

Car runs on road. (written in reverse order)

Ship sails in water.

Train runs on track.

Aeroplane runs in sky.

Hence, Car – Road is the odd pair.

Hence, answer is Car – Road.

In all pairs except 1, second number is double of the first number.

Hence, answer is 33 – 88.

L – 6 = F; F – 6 = Z

P – 6 = J; J – 7 = C

S – 6 = M; M – 6 = G

X – 6 = R; R – 6 = L

Hence, answer is PJC.

The dictionary order arrangement would be:

5. Ladies
6. Leisure
7. Lemonade

2.Liftoff

1. Lighten

Hence, the correct dictionary order is ‘54321’.

The pattern followed here is:

23 + 1 = 24

24 + 2 = 26

26 + 1 = 27

27 + 2 = 29

Same pattern will be followed for missing number

29 + 1 = 30

Hence, answer is 30.

The pattern followed here is:

P + 2 = R; R + 2 = T; T + 2 = V

C + 2 = E; E + 2 = G; G + 2 = I

M + 2 = O; O + 2 = Q; Q + 2 = S

Same pattern will be followed to find missing term:

V + 2 = X

I + 2 = K

S + 2 = U

Hence, answer is XKU.

Let, the present age of Reena = 4x

The present age of her husband = 5x

After 8 years,

Age of her husband = 24y

Age of her son = 9y

Present age of Reena = 32 years

4x = 32 years

⇒ x = 8

Present age of her husband = 5x = 5 × 8 = 40 years

After 8 years, age of her husband = 48 years

48 = 24y

⇒ y = 2

After 8 years, age of her son = 9y = 9 × 2 = 18

Present age of her son = 18 – 8 = 10

Hence, the correct answer is 10 years.

1. Paper → Preparation → can be formed.

2. Ration → Preparation → can be formed.

3. Part → Preparation → can be formed.

4. People → Preparation → cannot be formed as there is no letter ‘l’.

Hence, ‘People’ cannot be formed.

The pattern followed here is:

P + R + O + P = 16 + 18 + 15 + 16 = 65 + 2 = 67

R + A + T + E = 18 + 1 + 20 + 5 = 44 + 2 = 46

Same pattern will be followed for “MOCK”

M + O + C + K = 13 + 15 + 3 + 11 = 42 + 2 = 44

Hence, answer is 44.

Given equation ⇒ 35 – 12 + 10 × 50 ÷ 14 = ?

After Interchange

⇒ 35 × 12 ÷ 10 – 50 + 14

⇒ 35 × 1.2 – 50 + 14

⇒ 42 – 50 + 14

⇒ 42 + 14 – 50

⇒ 56 – 50

⇒ 6

Hence, correct answer is 6.

1. × and –

16 ÷ 4 – 8 × 10 + 14

= 4 – 80 + 14

= 18 – 80

= 62 ≠ 12

2. ÷ and ×

16 × 4 ÷ 8 – 10 + 14

= 16 × 0.5 – 10 + 14

= 8 – 10 + 14

= 12

3. ÷ and –

16 – 4 × 8 ÷ 10 + 14

= 16 – 3.2 + 14

= 26. 8 ≠ 12

4. – and +

16 ÷ 4 × 8 + 10 – 14

= 4 × 8 + 10 – 14

= 42 – 4

= 38 ≠ 12

Hence, by interchanging ÷ and × , we get the correct answer.

Hence, the correct answer is option 2.

The pattern followed here is

19 – 3 = 16 × 2 = 32

13 – 4 = 9 × 2 = 18

12 – 2 = 10 × 2 = 20

Same pattern will be followed for 17!3 = ?

17 – 3 = 14 × 2 = 28

Hence, answer is 28.

The logic followed here is

Here, Z is moving 1 step forward.

Thus, next term would be XYXYXYZXY.

Ship A is 24 Km south with respect to ship B.

Conclusion I: Some knives are blades → True (as all scissors are knives and some scissors are blades)

Conclusion II: All blades are knives → False (it is possible but not definite)

Hence, answer is Only conclusion I follows.

Here, AC represents Trekkers who are not Joggers.

Hence, the correct answer is AC.

The pattern followed here is:

H – 1 = G; G – 1 = F; F –1 = E

O – 2 = M; M –21 = K; K – 2 = I

T – 3 = Q; Q – 3 = N; N – 3 = K

Same pattern will be followed to find the missing term:

E – 1 = D

I – 2 = G

K – 3 = H.

Hence, answer is DGH

The pattern followed here is :

93 + 7 = 100

100 + 7 = 107

107 + 7 = 114

Same pattern will be followed to find the missing term

114 + 7 = 121

Hence, the missing term is 121.

In every group except group 4, there is difference of 10 in each number.

Hence, the odd pair is (19, 29. 49).

Hence, answer is option 1.

Components of option 2 can’t be adjacent to each other as they are opposite to each other.

Hence, answer is option 2.

1. 41, 97, 23, 65 → K, X, C, O

2. 44, 86, 11, 56 → J, V, H, P

3. 21, 98, 31, 86 → C, Z, D, V

4) 85, 13, 24, 56 → S, K, I, P

Hence, 85, 13, 24, 56 is set of number that represent word “SKIP”.

Let total number of people be x

Workers that are girls = 2x/3

Married girls = (1/2) × (2x/3) = x/3

Married girls who live in hostel = (1/3) × (x/3) = x/9

Girls who doesn’t live in hostel = (2x/3) - (x/9) = 5x/9

Workers that are boys = x - (2x/3) = x/3

Married boys = (3/4) × (x/3) = x/4

Married boys who lives in hostel = (2/3) × (x/4) = x/6

Boys who doesn’t live in hostel = (x/3) - (x/6) = x/6

Workers who don’t live in hostel = (5x/9) + (x/6) = 13x/18

∴ Part of workers who don’t live in hostel = 13/18

Divisibility law of 11 ⇒ The difference of the alternating sum of digits of the number must be either 0 or a multiple of 11 (e.g. 2343 is divisible by 11 because 2 - 3 + 4 - 3 = 0).

According to divisibility rule of 11, 65423547X46 is divisible by 11.

If 6 - 5 + 7 - 4 + 2 - 3 + 5 - 4 + 7 - X + 4 - 6 = 9 - X is divisible by 11

So, X = 9

$\frac{{2x; + ;y}}{{x; + ;4y}} = 3$

⇒ 2x + y = 3x + 12y

⇒ -11y = x

$\therefore ;\frac{{x; + ;y}}{{x; + ;2y}} = \frac{{ - 11y; + ;y}}{{ - 11y; + ;2y}} = \frac{{ - 10y}}{{ - 9y}} = \frac{{10}}{9}$

Formula used:

(a + b)2 = a2 + 2ab + b2

Calculation:

${x^2} + \frac{1}{{12}}x + {y^2}$

$⇒ {x^2} + 2\left( {\frac{1}{{24}}} \right)x + {y^2}$

If we take y = 1/24, we get

$⇒ {x^2} + 2\left( {\frac{1}{{24}}} \right)x + (\frac{1}{24})^2$

⇒ $(x + \frac{1}{24})^2$

∴ For ${x^2} + \frac{1}{{12}}x + {y^2}$ to be perfect square y = 1/24.

Alternate MethodEquation ${x^2} + \frac{1}{{12}}x + {y^2}$ represents the quadratic equation.

Compare this from ax² + bx + c = 0

⇒ a = 1, b = 1/24, c = y²

For perfect square, discriminent should be zero.

⇒ D = b² - 4ac = 0

⇒ (1/12)² - 4 . 1. y²

⇒ y² = (1/24)²

∴ y = 1/24

Calculation:

Statement (1) and (2) are the same statements told in a different manner so both of them are true

Now, the two triangles formed by tangents, radius and the line joining the external point to the centre are congruent by SAS rule as,

1. Radius is equal
2. 90° angle as tangent is perpendicular to radius at the point of contact
3. Length of two tangents drawn from an external point to a circle are equal

So, by Corresponding parts of concurrent triangle rule statement (3) is also true

∴ All option are correct

Concept used:

If any two sides and the angle included between the sides of one triangle are equivalent to the corresponding two sides and the angle between the sides of the second triangle, then the two triangles are said to be similar by SAS rule.

Calculation:

Now, the following conditions will give that both the triangles are similar.

⇒ ∠A = ∠D and AB/DE = AC/DF 

⇒ ∠B = ∠E and AB/DE = BC/EF

⇒ ∠C = ∠F and AC/DF = BC/EF

∴ The correct option is 4.

Calculation:

Let the price of one Table be Rs. x

Table bought for Rs.25000 = 25000/x

New price = x + 25% of x = x + 0.25x = 1.25x

Tables bought for Rs.25000 = 25000/1.25x = 20000/x

According to the question,

⇒ (25000/x) - (20000/x) = 25

⇒ 25000 - 20000 = 25x

⇒ 25x = 5000

⇒ x = 200

∴ The correct answer is Rs.200.

Shortcut TrickConcept used:

If the price is constant then,

Product used ∝ (1/price change)

Calculation:

Now,

⇒ (5 - 4) = 1 unit = 25 table

⇒ 5 unit = 125 tables

So the price of one table = 25000/125 = Rs.200

∴ The correct answer is Rs.200.

Given:

Sum to be divided among u, v and w = Rs.125.

⇒ u = v + 10

⇒ v = w + 5

Calculation:

According to the question:

⇒ u = v + 10    ----(1)

⇒ v = w + 5

⇒ w = v - 5     ----(2)

Also,

⇒ u + v + w = 125

⇒ (v + 10) + v + (v - 5) = 125

⇒ 3v = 120

⇒ v = 40

By equation (1),

⇒ u = 40 + 10 = 50

By equation (2),

⇒ w = 40 - 5 = 35

Required ratio = u ∶ v ∶ w = 50 ∶ 40 ∶ 35 = 10 ∶ 8 ∶ 7

∴ The correct answer is 10 ∶ 8 ∶ 7.

Given:

In the first alloy

Lead : Tin = 2 : 3

In the second alloy

Lead : Tin = 3 : 4

Calculation:

Let ‘x’ quantity of each of the two alloys be mixed

Quantity of lead in the new alloy = (2/5)x + (3/7)x = 29x/35

Quantity of tin in the new alloy = (3/5)x + (4/7)x = 41x/35

Required ratio = (29x/35) ∶ (41x/35) = 29 ∶ 41

∴ The correct answer is 29 ∶ 41.

Given:

Average of 6 boys = 14 years.

Average of 11 girls = 12 years

Calculation:

Average of 6 boys = 14 

Sum of ages of 6 boys = 14 × 6 = 84

Now,

Average of 11 girls = 12

Sum of age of 11 girls = 12 × 11 = 132

Now,

Sum of the age of all girls and boys together = 84 + 132 = 216

Average of all boys and girls = 216/17 = 12.7

∴ The correct answer is 12.7.

Given:

Simple interest on a sum for 10 years is equal to 5% of the principal.

Formula used:

Simple interest = (Principle × time × Rate)/100 

Calculation:

Let the principle be Rs. P

According to the question:

⇒ (Principle × time × Rate)/100 = 5% of P

⇒ (P × 10 × Rate)/100 = 5% of P

⇒ Rate = 0.5%

Now, let in 't' years the simple interest is equal to the principle

Simple interest = (P × 0.5 × t)/100

⇒ (P × t)/200 = P

⇒ t = 200 years

∴ The correct answer is 200 years.

Given:

S.P : C.P = 21 : 16

Calculation:

Profit % = {(S.P - C.P)/C.P} × 100

⇒ {(S.P/C.P) - 1} × 100

⇒ {(21/16) - 1} × 100 = 31.25%

∴ The correct answer is 31.25%.

Given:

C.P of 1 dozen apples = Rs.180/dozen

S.P of 1 dozen apple = Rs.19.5

Calculation:

Total cost price = 10 × 180 = Rs.1800

Total selling price = 10 × 12 × 19.5 = Rs.2340

Profit % = {(S.P - C.P)/C.P} × 100

⇒ {(2340 - 1800)/1800) × 100 = 30%

∴ The correct answer is 30%.

Given:

⇒ x = 4 + √15

Calculation:

⇒ x² = (4 + √15)²

⇒ 16 + 15 + 8√15 = 31 + 8√15

And

⇒ 1/x² = 1/(31 + 8√15)

⇒ (31 - 8√15)/(961 - 960) = 31 - 8√15

Now, put the values in the equation:

⇒ x² + (1/x²)

⇒ 31 + 8√15 + 31 - 8√15 = 62

∴ The correct answer is 62.

Calculation:

Let the number of masons be y.

Time taken = 10 days

Now, as 8 masons were absent,

Number of masons = (x - 8)

Time taken = 18

Now, as work done is equal

⇒ y × 10 = (y - 8) × 18

⇒ 10y = 18y - 144

⇒ 8y = 144

⇒ y = 18

∴ Original number of masons = 18

Calculation:

Let the speed of the boat be x km/h and the speed of the stream to be y km/h

The speed of the boat upstream = (x - y)

The speed of the boat downstream = (x + y)

According to the question,

{8/(x - y)} + {12/(x + y)} = 7

⇒ 8x + 8y + 12x - 12y = 7(x² - y²)

⇒ 20x - 4y = 7(x² - y²)     ----(1)

Also,

{9/(x - y)} + {18/(x + y)} = 9

⇒ x + y + 2x - 2y = (x² - y²)

⇒ 3x - y = (x² - y²)

⇒ 21x - 7y = 7(x² - y²)      ----(2)

Subtracting equation (1) from (2) we get,

⇒ x - 3y = 0

⇒ x = 3y

Now, from equation (1) we get,

⇒ 60y - 4y = 7(9y² - y²)

⇒ 56y = 56y²

⇒ y(y - 1) = 0

⇒ y = 1

Now,

⇒ x = 3y = 3 × 1 = 3 km/hr

∴ The speed of the boat in still water = 3 km/hr

According to the graph, Movie A is the favourite of most people ie 450 people

∴ Total number of people who responded to the survey = 450 + 300 + 100 + 300 + 350 + 250 + 50 = 1800

People whose favorite movie is C = 100

Total number of people who were surveyed = 1800

∴ Central angle = (100/1800) × 360° = 20°

People whose favorite movie is B and D = 300 + 300 = 600

Total number of people who were surveyed = 1800

∴ Required % = (600/1800) × 100 = 33.33%

Given:

Perimeter of the rhombus = 26 cm

Length of a diagonal (AC) = 5 cm

Concept used:

Diagonals of the Rhombus are perpendicular and bisect each other.

Calculation:

Perimeter of rhombus = 4 × side

⇒ 26 = 4 × AB

⇒ AB = 26/4 = 6.5 cm

Now,

⇒ AB = 6.5 cm

⇒ AO = AC/2 = 5/2 = 2.5 cm

In △ ABO

By Pythagoras theorem:

⇒ AO² + BO² = AB²

⇒ (2.5)² + BO² = (6.5)²

⇒ 6.25 + BO² = 42.25

⇒ BO² = 36

⇒ BO = 6 cm

⇒ BD = 2 × 6 = 12 cm

∴ The length of its other diagonal = 12 cm

Given:

Area of a semi-circle = 1925 cm2

Formula used:

Area of semicircle = (1/2) × π × (Radius)2

Calculation:

Area of semicircle = (1/2) × π × R²

⇒ (1/2) × (22/7) × R² = 1925

⇒ R² = 1225

⇒ R = 35 cm

∴ The correct answer is 35 cm.

Given:

Total surface area of cube = 253.5 cm²

Formula used:

Total surface area = 6 × Side²

Calculation:

Total surface area = 6 × Side2

⇒ 6 × Side² = 253.5

⇒ Side² = 42.25

⇒ Side = 6.5 cm

∴ The correct answer is  6.5 cm.

Given:

∠E = 90°; ∠F = 30°

Formula used:

Sin 60 = (√3/2) 

Calculation:

As, ∠E = 90° and ∠F = 30°

By angle sum property,

⇒ ∠D = 180° - (∠E + ∠F)

⇒ ∠D = 180° - (90° + 30°)

⇒ ∠D = 60°

Now,

Putting the value in the below equation:

Sin D - (1/3)

⇒ Sin 60° - (1/3)

⇒ (√3/2) - (1/3) = (3√3 - 2)/6

∴ The correct answer is (3√3 - 2)/6.

Given:

∠E = 90° 

Cosec D = 25/24

Calculation:

Cosec D = 25/24

⇒ DF/EF = 25/24

⇒ DF = 25k and EF = 24k

For Cos F, Base = EF and hypotenuse = DF

Cos F = EF/DF = 24k/25k = 24/25

∴ The correct answer is 24/25.

Generally, unemployment in a developing country takes place because of lack of complementary factors of production.

• There are four factors of production- land, labor, capital and organization/entrepreneurship.
• If the country is not able to generate employment opportunities to gainfully engage and involve these factors of production, the required amount of output cannot be produced and income cannot be generated, which usually, results in unemployment.
• Unemployment is the condition when a large number of able-bodied people of working age, who are willing to work but could not find work at the current wage levels.
• As of 2018, round about 31 million Indians are unemployed.
• Types of Unemployment are as follows:

The Ex-officio Secretary of NDC is Secretary of Planning Commission.

• NDC stands for National Development Council.
• Set up in 1952, it is the topmost body for making decisions and deliberations in progressive matters in India.
• It is presided over by the Prime Minister of India

• Vikramshila University was founded by the Pala King, Dharmapala in the late 8th or early 9th century.
• It was situated at Bhagalpur, Bihar.
• It was one of the largest Buddhist universities with more than 100 teachers and about 1000 students.
• The university prospered for around four centuries and was later destroyed by Bakhtiyar Khilji.

Lord Lytton used to write poetry with the pen name, "Owen Meredith".

• An English statesman and poet, Robert BulwerLytton (1831-1891), served as the Viceroy of India between 1876 - 1880.
• Some of his publications are as follows-
• Clytemnestra, The Earl's Return, The Artist, And Other Poems, 1855
• The Wanderer, 1859
• Lucile, 1860.
• The Ring of Ainasis, 1863
• Fables in Song, 1874
• Glenaveril, 1885
• After Paradise, or Legends of Exile, 1887, etc.

Krakatau : Malaysiais NOT correctly matched.

• Krakatau is the volcanic island located in the Sunda Strait in Indonesia.
• Etna is an active volcano in Italy.
• Fujiyama(also known as Mount Fuji) is the highest mountain in Japan.
• Popa is the volcano in Myanmar.

The correct answer is Parasnath.

Key Points

• Parasnath
• Parasnath Hills are a range of hills located in the Giridih district of Jharkhand.
• The highest peak is 1370 meters.
• It is one of the most important pilgrimage centers for Jains.
• They call it Sammed Sikhar. The hill is named after Parasnath, the 23rd Tirthankara.
• Twenty of the twenty-four Jain Tirthankaras attained salvation on this hill.
• The Santhals call it Marang Buru, the hill of the deity.
• They celebrate a hunting festival on the full moon day in Baisakh (mid-April).​

Additional Information

• Dhoopgarh
• Mount Dhupgarh is the highest point peak situated in the Mahadeo Hills (Satpura Range), Madhya Pradesh, India.
• Pachmarhi Hill station is situated near the peak.
• Pachmarhi is a hill station located in the Hoshangabad district of Madhya Pradesh state of central India.
• It has been the destination of a cantonment since British Raj.
• It is extensively known as Satpura ki Rani ("Queen of Satpura"), situated at a height of 1067 m in a valley of the Satpura Range in the Hoshangabad district.
• Dhupgarh, the highest point (1,352 m) present in Madhya Pradesh, and the Satpura range are situated here.
• It is also popular for Satpura Tiger Reserve.
• ​Pachmarhi
• ​It, also known as Satpura ki Rani, is a hill station in the central Indian state of Madhya Pradesh.
• Its many waterfalls include Apsara Vihar, with its calm pool, and soaring, single-drop Silver Fall nearby.
• The Bee Fall tumbles over a jagged rock face to the northwest.
• Leopards and Indian bison live in Satpura National Park.
• The ancient Pandav Caves are a group of 5 dwellings cut out of sandstone on a hill.
• Mahabaleshwar
• Mahabaleshwar is situated at Sahyadri mountain range in the Satara District of Maharastra.
• Its name is derived from a Lord Mahadev temple and three Sanskrit words, Maha (great), Bal (power) and Ishwar (God).
• Mahabaleshwar in Sanskrit means God of Great Power.
• Old Bombay Presidency used Mahabaleshwar as their summer capital.

Begum Akhtar (1914 - 1974) is associated with Music.

• Her real name is - Akhtari Bai Faizabadi.
• Given the title of Mallika-e-Ghazal, she is a classical singer of Indian Music.
• She was awarded PadmaBhushan, posthumously by the Indian Government.

China has built the world's biggest air purifier, a 328 feet high tower, to combat air pollution.

• Built in the Shaanxi province, it has given more than 10 million cubic meters of clean air since it was installed (January 2018).

Ramesh Kuntal Megh won the 2017 Sahitya Academy Award for Hindi literature.

• RameshKuntalMeghhas won this award for his work "Vishw Mithak Sarit Sagar", a literary criticism.
• A literary honor, Sahitya Academy Award, is given annually by the Sahitya Academy to writers of exceptional books.

The correct answer is Kathmandu.

Key Points

• The capital and largest city of Nepal is Kathmandu.
• It is situated at an altitude of 1,400 meters in the Kathmandu Valley.
• In the second century CE, the city was established.
• The valley has been the Newar people's home for centuries.
• It was formerly known as the "Nepal Mandala."
• The city is home to palaces, residences, and gardens that were created by the aristocracy of Nepal.
• Since 1985, it has served as the location of the South Asian Association for Regional Cooperation (SAARC) headquarters.​

Additional Information

• Hetauda:
• In the Bagmati Province in central Nepal's Makwanpur District is a sub-metropolitan city called Hetauda.
• It serves as the Makwanpur District's administrative hub.
• Pokhara:
• Central Nepal's Pokhara is a city on the Phewa Lake.
• It is referred to be the entrance of the Annapurna Circuit.
• Biratnagar:
• Biratnagar, a major city in Nepal, is the administrative center of Province No. 1.

Elements having same atomic numbers but a different mass number are called Isotopes.

• Isotopes have different physical properties and similar chemical properties.
• They are the atoms of the same element having the same numbers of protons but different numbers of neutrons.
• They have same chemical properties due to the same electronic configuration but different physical properties.

Washing soda is used for removing permanent hardness of water &as a cleansing agent for domestic purpose.

• The chemical formula for Washing Soda is Na₂CO₃, and the chemical name is Sodium Carbonate.
• It usually occurs as decahydrate crystal.
• It is also known as Soda Ash or Soda Crystals.

The minimum qualifications of a person to become a member of Lok Sabha:

• Must be a citizen of India&Must not be less than 25 years of age.
• The other conditions include:
• The candidate must be a voter for any parliamentary constituency in India.
• He/she must not hold an office of profit under Union Government.
• He should not be of an unsound mind.
• He/she must not be an undischarged insolvent.

The correct answer is Twice a year.

Key Points

• The Indian Parliament is mandated to convene a minimum of two sessions annually.
• Sessions refer to the periods when the Rajya Sabha and Lok Sabha assemble to conduct parliamentary proceedings.
• The Parliament of India conducts three distinct types of sessions:
• Budget session (February to May)
• Monsoon session (July to September)
• Winter session (November to December).
• Article 85 of the Indian Constitution bestows upon the President the authority to call for sessions of each House, ensuring that there is no interval exceeding six months between consecutive session

The small intestine is the longest part of the alimentary canal.

• The small intestine is also the largest part of the alimentary canal.
• The small intestine is divided into three regions:
• Duodenum (‘C’ shaped)
• Jejunum (a long coiled middle portion)
• Ileum (highly coiled)
• 90 percent of the absorption and digestion occurs in the small intestine.

Mistake Points

• The alimentary canal consists of the mouth, buccal cavity, pharynx, oesophagus, stomach, small intestine, large intestine, rectum, and anus. Hence small intestine is the correct answer.

The correct answer is Analogous organs.

Key Points

• Analogous organs: The organs which are different anatomically but similar functionally are called analogous organs.
• Eg. Wings of butterflies, birds, and bats, the Eyes of octopuses & mammals, and Flippers of penguins & dolphins.
• All these have different anatomical structures but they perform the same function like Wings of butterfly, birds & bats differs in structure but all of them perform the function of flight.
• Analogous organs always show convergent evolution.
• In convergent evolution, the species of different ancestry start sharing analogous traits because of selection pressure or shared environment.

Additional Information

• Homologous organs: The organs which are similar in structural design & origin i.e. same anatomical structure but different in functions are called Homologous organs.
• Eg. The forelimbs of some animals like whales, bats & cheetah have similar anatomical structures i.e., humerus, radius, ulna, metacarpals, and phalanges but different functions.
• The forelimb of the whale is used in swimming, a bat's forelimb is used for flight while a cheetah uses the forelimb for running.
• Homologous organs always show divergent evolution
• Vestigial organs: The remnant organs of our past ancestors that are now today considered ''use-less'' are called Vestigial organs

In August 2017, Environment Ministry of India launched ‘Gaj Yatra’ to protect Elephants.

• It was launched by the Union Environment, Forest and Climate Change Minister, Dr. Harsh Vardhan on the occasion of World Elephant Day, which is celebrated every year on 12^th August.
• ‘GajYatra’ is a journey to celebrate our national heritage animal, Elephant.
• It aims at protecting 100 elephant corridors across India.

Chinahas made the world’s largest amphibious aircraft named AG600.

• The plane is codenamed as Kunlong.
• It has the hull of a flying boat for waterborne operations along with a wheeled retractable undercarriage for alighting on land.
• AG600 is designed by the Aviation Industry Corporation of China (AVIC).

In August 2017, Indian Commodity Exchange (ICEX)launched world’s first future contracts in ‘diamonds’.

• A future contract is an agreement between two parties to buy or sell an asset at a specified time in the future at a predetermined price.
• Indian Commodity Exchange (ICEX) in August 2017 launched world’s first future contracts in ‘diamonds’ with 1-carat futures contracts, and then subsequently added the 50-cents contracts.
• In April 2018, it launched 30-cents diamond futures contracts.
• The futures contracts will provide companies with direct hedging facilities.
• ICEX has devised a mechanism in which the vault agency delivers the diamond bought by the investor at the doorstep of the client.
• ICEX provides a nation-wide online trading platform in commodity derivative.

The resistance of an electrical component if a current of 0.2 A passes through it on the application of 8 V of a potential difference across it is 40 Ω.

Formula: Potential Difference V = Current I × Resistance R

R = V ÷ I

So,

= 8 ÷ 0.2

= 40Ω.

Resistance is the hindrance offered to the current in its passage through the conductor.