SSC CHSL Previous Paper 24 (Held On: 14 March 2018 Shift 3) (Previous Year Paper)

The correct answer is 'Effusively'

Key Points

• The correctly spelled word is- 'Effusively'
• The meaning of the given words is- expressing gratitude, pleasure, or approval in an unrestrained manner.

The correct answer is 'BAC'

Key Points

• In the fixed part of the sentence, 'usher' is a verb hence after this we need a noun that is going to be an object of the sentence. As the noun is not written in any of these sentences then go for the prepositional phrase i.e. written in part B of the sentence.
• The last word of part B is 'which' it is a relative pronoun and we know that after the relative pronoun we need to write a verb which is written in part A.
• So the correct sequence is- BAC.

So the correct sentence is- Leaders usher in organisational change, which creates a natural tension as the status quo fights back.

The correct answer is 'Have given'

Key Points

• The given bracketed phrase is going to be replaced with 'have given'
• According to grammar, whenever the subject of the sentence is 'singular' use a singular verb and for a plural noun use a plural verb.
• In the given sentence, the subject is 'typewriters' that is in the plural form hence use a plural verb 'have given' also with the perfect tense we need to use 'the third form of the verb.'

So the correct sentence is- During the last decade, the typewriters have given way to the computers.

The correct answer is 'have got so addicted'

Key Points

• The given bracketed phrase is going to be replaced with 'have got so addicted'
• According to grammar, we need to use a plural verb for the plural noun 'people' so 'have' here is correct after this the verb 'got' is also correct because it is the third form of the verb.
• 'So' here is an adverb and we know that an adverb always qualifies an adjective or an adverb or a verb.
• 'Addict' is a noun here that is incorrectly placed so the correct word should be 'addicted'

So the correct sentence is- People have got so addicted to their virtual life that they forget there is more to life than just sitting in front of a plastic box.

The correct answer is 'Speculation'

Key Points

• Let's see the meaning of the given words-
• Verification→ the establishment by empirical means of the validity of a proposition.
• Substantiation→ the act of showing something to be true, or of supporting a claim with facts.
• Speculation→ the forming of a theory or conjecture without firm evidence.
• Attestation→ a formal statement that you make and officially say is true.
• So according to the meaning of the given words, the correct answer is 'speculation'

The correct answer is 'Samizdat'

Key Points

• The meanings of the words are:
• Wanton→ (of a cruel or violent action) deliberate and unprovoked.
• Brazen → bold and without shame.
• Flagrant→  conspicuously or obviously offensive.
• Samizdat→ the clandestine copying and distribution of literature banned by the state, especially formerly in the communist countries of eastern Europe.
• So according to the meaning of the given words, the correct answer is 'Samizdat'

The correct answer is 'A state of happiness based on a person's ignorance about potential trouble.'

Key Points

• The meaning of the given idiom 'A fool's paradise' is 'a state of happiness based on a person's not knowing about or denying the existence of potential trouble.'
• Let's see an example-
• They were living in a fool's paradise, refusing to accept that they were in debt.

The correct answer is 'Take on a commitment one cannot fulfill.'

Key Points

• The meaning of the given idiom 'Bite off more than you can chew' is 'take on a commitment one cannot fulfil.'
• Let's see an example-
• We bit off more than we could chew in our original reform proposals.

The correct answer is 'Different'

Key Points

• In the given blank, we need an adjective for the noun 'qualities'.
• Let's see the options-
• Difference is a noun.
• Different is an adjective.
• Differences is a plural noun.
• Differently is an adverb.
• So the correct answer is 'Different'

The correct answer is 'confusion'

Key Points

• In the given blank, we need a noun because there is a definite article before the blank.
• Let's see the options-
• Confuse is a verb.
• Confusing is a present participle.
• Confused is a past participle.
• Confusion is a noun.
• So the correct sentence is- Avoid some of the confusion that results

The correct answer is 'Logical'

Key Points

• In the given blank, we need an adjective because there is a definite article before the blank and after the blank, there is a noun i.e. 'method'
• Hence, here the adjective is used in an attributive manner. The structure for this is 'A/An/The + Adjective + Noun'
• Let's see the options-
• Logic is a noun, Logics is a plural noun, Logical is an adjective, Logically is an adverb.

So the correct sentence is 'And it hoped that the logical method for the study'

The correct answer is 'of'

Key Points

• 'On the basis of' is an idiom that means 'according to or based on' Hence, the usage of the preposition 'of' is correct.
• Let's see an example-
• Students were selected on the basis of their grades and test scores.

The correct answer is 'an'

Key Points

• 'Attempt' is a countable noun that means 'to do something, you try to do it, often without success.' Hence, with countable nouns we can use 'the indefinite articles' the indefinite articles are 'a/an'.
• In this sentence, we need to use 'an' because 'attempt' has a 'vowel' sound. With consonant sounding words, we have to use 'a'

So the correct sentence is-  much space to an attempt to find principles

The correct answer is 'Sergeant'

Key Points

• The correct spelling is 'Sergeant'
• The meaning of the given word is- 'A police officer ranking below an inspector' or 'A rank of non-commissioned officer in the army or air force.'
• So the correct answer is 'Option 3'

The correct answer is 'I told them to be silent'

Key Points

• As imperative sentences have a command (an order), a request, advice, or a suggestion to change them into indirect speech some specific verbs are (i.e. requested, order, advised, forbade, suggested). Also, in the reported speech use the main verb as the verb of the infinitive in indirect speech.
• In the given sentence, 'be' is the main verb and 'silent' is an adjective.

So the correct Indirect speech is- I told them to be silent.

Additional Information

The following table will enable us to know how tense changes into Indirect speech:

The correct answer is 'I was thrown into a ditch by her.'

Key Points

• In Active Voice, a sentence emphasizes the subject, performing an action.
• In Passive Voice, a sentence emphasizes the action or the object of the sentence.
• In the given sentence, the subject is 'she' and the verb is 'threw' i.e. in the past tense, and the indirect object 'me'
• So the correct passive voice is- I was thrown into a ditch by her.

Additional Information

Verbs of passive format have a different set of tenses (*V3 - Past participle or Third form of the Verb) as given below in the table:

The correct answer is 'PRQ'

Key Points

• In the fixed sentence, the last word is 'of' hence for this we need a noun to make a prepositional object. The noun is written in part P is 'modern economics' is going to be the prepositional object for the preposition.
• The last word in 'P' is 'that' hence after this, we need a verb that is written in part Q i.e. 'enhanced'
• So the correct sequence is- PRQ
  

The ideology of modern economics suggests that material progress has yielded enhanced satisfaction and well-being .

The correct answer is 'Cheerful'

Key Points

• Let's see the meaning of the given words-
• Melancholy→ means 'deep and long-lasting sadness'
• Moody→ means 'given to unpredictable changes of mood, especially sudden bouts of sullenness'
• Low→ means 'below average in amount'
• Cheerful→ means 'noticeably happy and optimistic.'
• So according to the meaning of the given words, the correct answer is 'Cheerful'

The correct answer is 'save'

Key Points

• Let's see the meaning of the given words- 
• Fritter→ means 'waste time, money, or energy on trifling matters.'
• Dwindle → means reduce
• Dissipate → means with reference to a feeling or emotion disappear or cause to disappear.
• So according to the meaning of the given words, the correct answer is 'save'

The correct answer is 'Decay'

Key Points

• Let's see the meaning of the given words-
• Declension→ The condition of decline or moral deterioration.
• Decay→ Decline in quality or vigor; deteriorate.
• Decision→ conclusion or resolution.
• Improvement→ An instance of being improving or being improved.
• Increase→ means to make or become greater in size, amount, or degree.
• So according to the meaning of the given words, the correct answer is 'Decay'

The correct answer is 'Enigmatic'

Key Points

• Let's see the meaning of the given words-
• Enigmatic→ means 'difficult to interpret or understand' ​​
• Obvious→ means 'easily perceived or understood'
• Mysterious→ means 'difficult or possible to understand'
• Plain→ means 'not decorated or elaborate'
• Known→ means 'recognized or familiar'
• So according to the meaning of the given words**, the correct answer is 'Mysterious'**

The correct answer is 'Despair'

Key Points

• Let's see the meaning of the given words-
• Flair→ means 'a natural ability or talent' and it is a noun.
• Glair→ means 'Used as an adhesive for bookbinding' and it is a noun.
• Stair→ means 'each of a set of fixed steps' and it is a noun.
• Despair→ means 'complete loss or absence of hope'
• So according to the meaning of the given words, the correct answer is 'despair'

So the correct sentence is- Faith is the only power that can inspire a human being who is in despair

The correct answer is 'is'

Key Points

• An exclamatory sentence conveys strong emotion and ends with an exclamation mark.
• Let's see the sentence structure-
• 'How' is an adverb
• 'Lucky' is an adjective.
• 'Serena' is a noun that is the subject of the sentence.
• 'Lucky' adjective is used for 'Serena' hence this is the subject complement and we know that the subject complement and the subject of the sentence are connected with the linking verbs.
• In the given options, there is only one linking verb present i.e. 'is'

So the correct sentence is- She kept thinking, "how Lucky Serena is!"

The correct answer is '2' i.e. error lies in part 2 of the sentence.

Key Points

In part 2 of the sentence, the usage of 'was' is incorrect Instead, use 'were'

• According to grammar, whenever we have used the singular verb we need to use a singular verb and with a plural noun, we have to use a plural verb.
• In the given sentence, the noun 'behaviors' is a plural noun hence there should be a plural verb for it. 'Some' is a determiner i.e. used for 'behaviors'

So the correct sentence is- There is a general agreement that some behaviors that are common in birds as well as in crocodiles, were also common among extinct dinosaur groups.

The correct answer is '3'

Key Points

In part 3 of the sentence, the usage of 'to yell' is incorrect Instead, use 'yell'

• According to grammar, the object of the sentence is 'it' hence for this object we have to use the object complement and it can be a noun/pronoun/adjective/adverb but it cannot an infinitive phrase or a prepositional phrase.
• Hence, according to this rule we need to omit 'to' before the noun 'yell'

So the correct sentence is- The noise startled the dog and made it yell.

As ‘Bus’ is a ‘Vechicle’ similarly ‘Spinach’ is a ‘Vegetable’.

Hence, the related word pair is ‘Vegetable : Spinach’.

The pattern followed here is,

63 : 105

→ 21 × 3 : 21 × 5

Similarly,

48 : ?

→ 16 × 3 : 16 × 5

→ 48 : 80

Hence, the related number is ‘80’.

The pattern followed here is,

ADF : KNP

→ A + 10 = K, D + 10 = N, F + 10 = P

Similarly,

ILN : ?

→ I + 10 = S, L + 10 = V, N + 10 = X

Hence, the related letters are ‘SVX’.

Here pair of ‘Purpose and Place’ is given in all options except Court – Justice (option 1).It might be  Justice - court

Hence, the odd word pair is ‘Court - Justice’.

The logic followed here is,

1. 63 – 67 → 63 + 4 = 67

2. 17 – 21 → 17 + 4 = 21

3. 39 – 43 → 39 + 4 = 43

4. 31 – 37 → 31 + 4 ≠ 37

Hence, the odd number pair is ’31 - 37’.

The pattern followed here is,

1. CHM → C + 5 → H + 5 → M

2. GLQ → G + 5 → L + 5 → Q

3. KPV → K + 5 → P + 5 → U (given V)

4. NSX → N + 5 → S + 5 → X

Hence, the odd letters are ‘KPV’.

Dictionary order:

1. Budge
2. Bulb
3. Bumper
4. Cannon
5. Capable

Clearly, the second word as per the dictionary order is ‘Bulb’.

The pattern followed in the series is,

13 + 9 → 22 × 3 → 66 + 9 → 75 × 3 → 225 + 9 → 234 × 3 → 702 + 9 → 711

So, the missing number in the series is ‘75’.

The pattern followed in the series is:

Hence, the next number in the series will be ‘RK’.

Rahul’s rank from the left = 33

Rajat’s rank from the right = 35

Rajat’s rank = 17 to the right of Rahul

So, Rajat’s rank from the left = 33 + 17

→ 50

Total students = Rajat’s rank from left + Rajat’s rank from the right – 1

→ 50 + 35 – 1

→ 84

Rahul’s rank from the right = Total students – Rahul’s rank from the left – 1

→ 84 – 33 + 1 = 52

Hence, Rahul’s rank from the right is 52.

1. Neat → Superannuated → can be formed.

2. After → Superannuated → cannot be formed as there is no letter ‘f’.

3. Sure → Superannuated → can be formed.

4. Super → Superannuated → can be formed.

Hence, ‘After’ cannot be formed.

Here, the place value of letters as per the alphabetical order is takes as code.

‘PRICE’ is coded as follows,

‘VALUE’ is coded as follows,

Similarly, ‘MARK’ will be coded,

Hence, ‘MARK’ will be coded as ‘1311811’.

Given equation: 6 ÷ 10 - 30 + 4 × 12 = ?

On changing symbols,

6 - 10 + 30 × 4 ÷ 12

→ 6 – 10 + 10

→ 6

Hence, the correct answer is ‘6’.

Given equation: 90 ÷ 10 + 5 - 6 × 4 = 28

1. • and +

On interchanging symbols, we get,

90 ÷ 10 - 5 + 6 × 4 = 28

→ 9 – 5 + 24

→ 28 = 28

2. ÷ and ×

On interchanging symbols, we get,

90 × 10 + 5 - 6 ÷ 4 = 28

→ 900 + 5 – 1.5

→ 905 – 1.5

→ 903.5 ≠ 28

3. × and -

On interchanging symbols, we get,

90 ÷ 10 + 5 × 6 - 4 = 28

→ 9 + 30 – 4

→ 35 ≠ 28

4. ÷ and -

On interchanging symbols, we get,

90 ­- 10 + 5 ÷ 6 × 4 = 28

→ 90 – 10 + 3.33

→ 83.33 ≠ 28

Hence, on interchanging ‘- and +’, the equation will become correct.

The pattern followed here is,

3@7 = 20

→ (3 + 7) × 2 = 20

 8@1 = 18

→ (8 + 1) × 2 = 18

6@5 = 22

→ (6 + 5) × 2 = 22

Similarly,

4@4 = ?

→ (4 + 4) × 2

→ 16

Hence, the answer is 16.

Here, the position of ‘aba’ and ‘bab’ is moving one position forward (i.e. towards right) as shown below,

Hence, the next term in the series is ‘ABABAbab’.

The following diagram shows the path covered by the flies,

Distance from the starting point = 20 + 40

→ 60 km

Clearly, the flies are 60 km away towards east with respect to the starting point.

The least possible Venn Diagram for the given statements is as follows,

Conclusion I: Some razors are knives → follows.

Conclusion II: No knives are blades → not follows.

Hence, only conclusion I follows.

Clearly, ‘G, J, K’ represents Accountants who are either Food stylish or Europeans.

The pattern followed here is,

Hence, the missing letters in the series is ‘BUS’.

The pattern followed here is,

1 + 1 → 2 + 2 → 4 + 3 → 7 + 4 → 11 + 5 → 16

Hence, the next term in the series is ‘16’.

(6, 25, 19): 19 + 6 = 25

(9, 36, 28): 28 + 9 = 37 ≠ 36

(7, 29, 22): 22 + 7 = 29

(5, 21, 16): 16 + 5 = 21

Hence, (9, 36, 28) is the correct answer.

The mirror image of the given question figure is as follows,

Hence, the answer is option 2.

The opposite faces are:

Here, dice (option) 3 cannot be formed as the ‘two crossed line face’ and the ‘square within the circle face’ are opposite to each other.

Hence, the answer is option 3.

1. 21, 23, 11, 96 → H, E, A, P

2. 23, 55, 30, 76 → E, Y, I, Q

3. 13, 69, 22, 99 → A, N, L, W

4. 41, 96, 30, 58 → J, P, I, N

Hence, ‘HEAP’ will be represented by ‘21, 23, 11, 96’.

Calculation:

The first multiple of 7 is = 7

Second multiple of 7 is = 7 × 2 = 14

Similarly 30^th multiple of 7 is = 7 × 30 = 210

So,

AP is 7 + 14 + ……. + 210

Average of AP = (First term + Last term)/2

⇒ (7 + 210)/2

⇒ 217/2

⇒ 108.5

∴ The correct answer is 108.5.

Given:

√5 = 2.236

Calculation:

According to the question:

⇒ $\frac{{\surd 5}}{{5 - \sqrt 5 }}$

Taking √5 commons from the denominator

$\Rightarrow \frac{1}{{\sqrt 5 - 1}}$

$\Rightarrow \frac{1}{{\left( {\sqrt 5 - 1} \right)}} \times \frac{{ {\sqrt 5 + 1})}}{{\sqrt 5 + 1}}$

⇒ (√5 + 1)/(5 - 1)

⇒ (2.236 + 1)/4

⇒ 3.236/4 = 0.809

∴ The correct answer is 0.809.

Given: 

x + 1/x = -2

Calculation:

If we put x = -1

⇒ x + 1/x = -2

⇒ -1 -1 = -2

⇒ -2 = -2

Equation satisfied with x = -1

So,

⇒  x⁵³¹ + 1/x⁵³²

⇒ (-1)⁵³¹ + 1/(1⁵³²)

⇒ -1 + 1

⇒ 0

∴ The correct answer is 0.

Given:

y = 0, x + 6 = 0 and 2x - 3y = 6

Concept used:

Plot the graph of the equations on the x-axis and y-axis.

Formula used:

Area of triangle = 1/2 × Base × Height

Calculation:

These points we represent on Graph

Area of right ∆ABC = 1/2 × BC × AB

⇒ BC = (0 - 6) = 6

⇒ AB = (3 - (-6)) = 3 + 6

⇒ AB = 9

⇒ 1/2 × 6 × 9 = 27

∴ The area of the triangle is 27 sq. units.

Calculation:

∠B = ∠M = 50

∠A = ∠N = 80

Hence

∠C = ∠P (Angle-Angle Similarity)

∆BAC ~ ∆MNP

∴ The correct option is 2.

Given:

BD = 7.5 cm

And, BC = 9 cm

Calculation:

⇒ DC = BC - BD

⇒ 9 - 7.5 = 1.5 cm

⇒ AB/AC = BD/DC (Interior-Angle-Bisector Theorem)

⇒ AB/AC = 7.5/1.5

⇒ AB : AC = 5 : 1

∴ The correct answer is 5 : 1.

Given:

170% of a number added to 66,

the result becomes equal twice

Calculation:

Let the number be = x

According to the question

⇒ x × 170/100 + 66 = 2x

⇒ 17x/10 + 66 = 2x

⇒ 2x - 17x/10 = 66

⇒ 3x/10 = 66

⇒ x = 220

∴ The correct answer is 220.

Given:

The ratio of Mohit and Sunil’s present age = 7 : 9

Calculation:

Let Mohit’s present age is 7x and Sunil’s present age is 9x

According to the question,

⇒ 9x - 7x

⇒ 2x = 4

⇒ x = 2

So,

The present age of Mohit

⇒ 7 × 2

⇒ 14

And,

The present age of Sunil

⇒ 9 × 2

⇒ 18

After 6 years, the ratio of their age will be

⇒ 14 + 6 : 18 + 6

⇒ 20 : 24

⇒ 5 : 6

∴ The correct answer is 5 : 6.

Given:

Unbroken rice : Broken rice = 3 : 2

Calculation:

Let the quantity of unbroken and broken rice grains be 3 and 2 units respectively

Let x units of the mixture be taken out

So,

Unbroken rice grains in (5 - x) units of a mixture

⇒ 3/5 × (5 - x).

Similarly,

after adding broken rice grains,

Broken rice grains in the mixture

⇒ 2/5 × (5 - x) + x

According to the question,

⇒ $\frac{{\frac{3}{5}\left( {5 - x} \right)}}{{\frac{2}{5}\left( {5 - x} \right) + x}} = \frac{1}{1}$

⇒ 3 - 3x/5 = 2 - 2x/5 + x

⇒ 1 = 6x/5

⇒ x = 5/6

Required fraction

⇒ (5/6)/5

⇒ 1/6

∴ The correct answer is 1/6.

Shortcut TrickConcept used:

After the mixture is drawn off the ratio must be constant

Calculation:

Let the quantity to be drawn from the mixture = 'x'

So,

Now,

Broken rice added = (3 - 2) = 1 unit = x

So,

mixture drawn off = x = 1

So,

total previous mixture

⇒ (3 + 2) + 1 = 6

Required fraction = 1/6

∴ The correct answer is 1/6.

Given:

Average of 10 numbers = X

Calculation:

If, 38 replaced with 19

then,

The new average will be

⇒ X - (38 - 19)/10

⇒ X - 19/10

∴ The correct answer is  X - 19/10.

Given:

Principal (P) = Rs. 67400

Time (T)= 14/12 years

Simple interest (SI) = Rs. 4718

Concept used:

SI = (P × R × T)/100

Calculation:

⇒ 4718 = (67400 × R × (14/12))/100

⇒ R = 4718 × 100 × 12/(67400 × 14)

⇒ R = 6%

∴ The rate of interest is 6%.

Shortcut Trick

When profit is given in terms of Cost Price (CP), use the direct ratio:

Profit % = (Units of Profit ÷ Units Sold) × 100

Profit % = (8 ÷ 25) × 100

Profit % = 8 × 4 = 32%

∴ The correct answer is 32%.

Alternate Method

Given:

Quantity of shirts sold = 25

Profit = Cost Price of 8 shirts

Formula Used:

Profit % = (Total Profit ÷ Total Cost Price) × 100

⇒ Let the Cost Price (CP) of 1 shirt = ₹1

⇒ Total Cost Price of 25 shirts = 25 × 1 = ₹25 ⇒ Profit earned = CP of 8 shirts = 8 × 1 = ₹8 ⇒ Profit % = (8 ÷ 25) × 100 ⇒ Profit % = 8 × 4 ⇒ Profit % = 32%

∴ The correct answer is 32%.

Additional Information

Profit in terms of Selling Price

If profit is equal to the Selling Price (SP) of 'n' items on selling 'x' items, then Profit % = [n ÷ (x − n)] × 100.

Relationship between CP, SP and Profit %

Selling Price (SP) = CP × (100 + Profit %) ÷ 100. Conversely, CP = [SP × 100] ÷ (100 + Profit %).

Loss in terms of Cost Price

If loss is equal to the CP of 'n' items on selling 'x' items, then Loss % = (n ÷ x) × 100.

Given:

The successive discounts is 30% and 20%.

Formula used:

Successive discount = X + Y - (XY)/100

Where,

X = First discount

Y = Second discount

Calculation:

Successive discount = X + Y - (XY)/100

⇒ X = 30%, Y = 20%

⇒ 30 + 20 - 600/100

⇒ 44%

∴ The single equivalent discount is 36%.

 Alternate MethodCalculation:

SP = MP - (Discount %/100) × MP

Let the marked price be Rs. x

New price after discount = x - (30/100) × x

⇒ Rs. 0.7x

Price after successive discount = 0.7x - (20/100) × 0.7x

⇒ Rs. 0.56x

Total discount = x - 0.56x

⇒ 0.44x

Discount% = (Discount)/MP × 100

Discount % = (0.44x)/x × 100

⇒ 44%

∴ The correct answer is 44%.

Given:

x = 1.1

Calculation:

⇒ √(4x² - 4x -1)

⇒ √(2x - 2 × 2x × 1 + 1²)

⇒ √(2x - 1)²  

⇒ 2x - 1

By putting the value x = 1.1 we get,

⇒ (2 × 1.1) - 1

⇒ 2.2 - 1 

⇒ 1.2

∴ The correct answer is 1.2.

Shortcut Trick

Total Work (LCM of 21 and 28) = 84 units.

Combined Efficiency of Manish and Karan = 4 + 3 = 7 units/day.

Work completed in 7 days = 7 × 7 = 49 units.

Remaining work = 84 − 49 = 35 units.

Fraction of total work left = 35 / 84 = 5/12.

∴ The correct answer is 5/12.

Alternate Method

Given: Manish completes work in 21 days; Karan completes work in 28 days; They work together for 7 days.

Formula: Efficiency = Total Work ÷ Time; Remaining Fraction = Remaining Work ÷ Total Work.

⇒ Total Efficiency of (Manish + Karan) = 4 + 3 = 7 units/day

⇒ Work done in 7 days = 7 × 7 = 49 units

⇒ Remaining work = 84 − 49 = 35 units

⇒ Fraction of work left = 35 / 84 = 5/12

∴ The correct answer is 5/12.

Additional Information

Total Work Concept

Total work is always considered as 1 unit in fraction-based methods or the LCM of days for efficiency-based methods.

Combined Rate of Work

If person A takes x days and B takes y days, their 1-day work together is (1/x + 1/y).

Work Left Formula

Fraction of work left = 1 − (Work Done / Total Work) or simply (Remaining Units / Total Units).

Given:

1st tunnel length = 270 m

2nd tunnel length = 450 m

Calculation:

Let the length of the train be L meters and the speed of the train be x km/h

According to the question,

⇒ (L + 270)/12 = (L + 450)/15

⇒ (L + 270)/4 = (L + 450)/5

⇒ 5L + 1350 = 4L + 1800

⇒ L = 450

Thus,

speed of the train = (450 + 270)/12

⇒ 720/12

⇒ 60 m/s

⇒ 60 × 18/5

⇒ 216 km/h

∴ The correct answer is 216 km/h.

Calculation:

Motorcycle brand C were the second highest in the unit sold = 280

∴ The correct answer is 280.

Calculation:

Unit sold of brand A = 180

And Unit sold of brand C = 280

⇒ A : B = 180 : 280 = 9 : 14

∴ The correct answer is 9 : 14.

Calculation:

Unit sold of brand D = 140

Unit sold of brand E = 200

Brand D lesser than that of brand E by = (200 - 140)/200 × 100 = 60/200 × 100 = 30%

∴ The correct answer is 30%.

Calculation:

Total sales = A + B + C + D + E + F + G = 180 + 340 + 280 + 140 + 200 + 120 + 240 = 1500

∴ The correct answer is 1500.

Given:

Diagonal of rectangle = 13 cm

Breadth of rectangle = 5 cm

Formula used:

Area of rectangle = length × breadth

Calculation:

Diagonal of the rectangle AC = 13

And, the breadth of a rectangle is BC = 5

Using Pythagoras theorem,

AB² = AC² - BC²

⇒ AB² = 13² - 5²

⇒ AB² = 169 - 25

⇒ AB² = 144

⇒ AB = 12 cm

Area of rectangle = l × b = AB × BC = 12 × 5 = 60 cm² 

∴ The correct answer is 60 cm2 .

Formula used:

Sum of the Interior angle of a regular polygon whose side is n = (n - 2) × 180

Calculation:

Sum of the measures of all the interior angles = (5 - 2) × 180° = 3 × 180° = 540°

∴ The correct answer is 540°

Given:

Volume of a sphere = 179.67 cm3

Formula used:

Volume of sphere = 4/3 × πr³

Calculation:

Volume of sphere = 4/3 × πr3

⇒ 179.67= 4/3 × (22/7) × r³

⇒ r³ = 179.67 × 21/88 

⇒ r = 3.5 cm

So, diameter (d) = 3.5 × 2 = 7 cm

∴ The correct answer is 7 cm.

Calculation:

⇒ (cos 45° - 1/3) = 1/√2 - 1/3 = (3 - √2)/3√2

∴ The correct answer is (3 - √2)/3√2.

Given

ΔUVW is right angled at V.

sec U = 5/3

Calculation:

sec U = 5/3,

⇒ Hypotenuse/Base = 5/3

⇒ UW/VU = 5/3

Let UW = 5k and UV = 3k

In Δ VUW

⇒ (UW)² = (VW)² + (VU)²

⇒ (5k)² = (VW)² + (3k)²

⇒ VW = 4k

tan W = Perpendicular/base = UV/VW = 3k/4k = 3/4

∴ The correct answer is 3/4.

• ASEAN or the Association of Southeast Asian Nations is a regional intergovernmental organization which comprises 10 Southeast Asian nations- Singapore, Thailand, Indonesia, Malaysia, Vietnam, Cambodia, Myanmar, Laos, Philippines, and Brunei.
• The organization promotes intergovernmental cooperation and facilitates sociocultural, educational, military, security, political, and economic integration among the members.

• In India, Planning derives its objectives and social premises from the Directive Principles of State Policy.
• The Planning Commission was first set up in India in March 1950 and Jawaharlal Nehru was its first Chairman.
• The objective behind setting it up was to promote a rapid rise in the standard of living of the people in the country by efficiently exploiting the resources of the country.

The hills, namely Black, Blue, and Green Hill, are located in the USA.

​The correct answer is Uttarakhand and Tibet.

Key Points

• The river Ganga originates from Devprayag in Uttarakhand at the confluence of the rivers Alaknanda and Bhagirathi.
• The river Brahmaputra originates from the Angsi Glacier in Burang County, Tibet.

Important Points

• Ganga River: 
• The Ganges rises in the southern Great Himalayas on the Indian side of the border with the Tibet Autonomous Region of China.
• Its five major streams—the Bhagirathi, the Alaknanda, the Mandakini, the Dhauliganga, and the Pindar—all rise in the mountainous region of northern Uttarakhand state.
• Among them, the two main streams are the Alaknanda (the longer of the two), which rises about 30 miles (50 km) north of the Himalayan peak of Nanda Devi, and the Bhagirathi, which rises about 10,000 feet (3,000 m).  above sea level in a subglacial meltwater cave at the base of a Himalayan glacier known as Gangotri.
• Gangotri itself is a holy place for Hindu pilgrimage. However, the original source of the Ganges is believed to be Gaumukh, about 13 miles (21 km) southeast of Gangotri.
• Brahmaputra River: 
• The source of the Brahmaputra is the Chemayungdung Glacier, which covers the Himalayan slopes about 60 miles (100 km) southeast of Mapam Lake in southwestern Tibet.
• The Kubi, Angasi, and Chemayungdung are the three major streams that originate there.
• From its source, the river runs in a generally easterly direction for about 700 miles (1,100 km) between the Great Himalayan Range in the south and the Kailas Range in the north.
• Throughout its upper course, the river is generally referred to as the Tsangpo ("purifier").
• It is also known by its Chinese name (Yarlung Zangbo) and other local Tibetan names.

The correct answer is On philosophy.

Key Points

• The Upanishads are late Vedic Sanskrit texts of religious teachings and ideas still revered in Hinduism.
• The Upanishads played an important role in the development of spiritual ideas in ancient India, marking a transition from Vedic ritualism to new ideas and institutions.
• Upanishad literally means ‘approaching and ​sitting near’ and the texts contain conversations between teachers and students.
• Often, ideas were presented through simple dialogues.
• The Upanishads were written over a time period ranging from 700 to 400 B.C.E
• Upanishads focused on Spiritual enlightenment.
• Upanishad is derived from the words upa (near) and shad (to sit). It is derived from the concept of sitting near the feet of the teacher.
• More than 200 Upanishads have been discovered.
• Each Upanishad is associated with a certain Veda.
• There are 14 Upanishads  which are most well known or most important – Katha, Kena, Isa, Mundaka, Prasna, Taittiriya, Chhandogya, Brihadaranyaka, Mandukya, Aitareya, Kaushitaki, Svetasvatara and Maitrayani.
• Upanishads are in the last section of any Vedas. Upanishads are a subcategory of a Veda.
• Upanishads is one of the 4 major text types of Vedas.
• Upanishads are texts on spiritual knowledge and philosophy.
• Upanishads originated from each branch of Vedas.
• Upanishads deals with the philosophical aspects of life.

• Ramakrishna Mission is a Hindu spiritual and religious organisation which was founded by SwamiVivekananda on 1 May 1897 and is inspired by the Indian saint Ramakrishna Paramahamsa.
• The organization propagates the 4 yogic ideals- Raja, karma, bhakti, and jnana and Hindu philosophy of Vedanta.

The correct answer is Flute.

Key Points

• Pannalal Ghosh was a popular flute player and composer who died in 1960.
• He was also known as the 'Pioneer of Indian Classical Flute'.
• The original name of Pannalal Ghosh was Amal Jyoti Ghosh.

Additional Information

• Ramnad Raghavan was a well-known instrument player of Mridangam.
• Ali Akbar Khan was a Bengali Hindustani classical musician of Maihar Gharana, known for playing the instrument Sarod.
• Ustad Bismillah Khan (Real name is Qamaruddin Khan), was an Indian musician credited with popularizing the Shehnai.

• The first ever disaster management exercise of BIMSTEC countries was held in New Delhi in October 2017.
• The exercise served as a platform for strengthening regional coordination and response for disaster management among the member countries of BIMSTEC and also for sharing best practices on all the aspects of DRR (Disaster Risk Reduction).

Chile was named the best country to visit in 2018, according to the Lonely Planet 'Best in Travel 2018' list in October 2017, followed by South Korea, Portugal, Djibouti, New Zealand, Malta, Georgia, Mauritius, China, and South Africa as the top 10.

the correct answer is 2008.

Key Points

• Constitution of Bhutan
• The Constitution of Bhutan was enacted on 18 July 2008 by the Royal Government of Bhutan.
• Bhutan's political system has changed from an absolute monarchy to a constitutional monarchy.
• Bhutan is the Sovereign Kingdom and the Sovereign power belongs to the people of Bhutan.
• This Constitution is the Supreme Law of the State.
• The current Constitution is based on Buddhist philosophy, international Conventions on Human Rights, comparative analysis of 20 other modern constitutions, public opinion, and existing laws, authorities, and precedents.
• The Constitution defines the Kingdom of Bhutan as a democratic constitutional monarchy belonging to the people of the Kingdom.

Additional Information

• Princess Ashi Sonam Dechen Wangchuck is a princess of Bhutan.
• She is the daughter of the fourth King of Bhutan Jigme Singye Wangchuck and his wife, Queen Mother Ashi Dorji Wangmo Wangchuck.
• Lotay Tshering is the current PM of Bhutan.

• Atomic number is always equal to the number of protons present in the nucleus.
• However, if the atom has no electrical charge present in it, then the atomic number is also equal to the number of electrons present since the number of protons and electrons will be the same.

Electrons:

• Discovered by Sir J.J Thomson in the year 1897.
• Previously named as cathode rays as they were supposed to be emitted from the cathode.
• They are deflected towards the positive side.
• They have high kinetic energy.
• They are deflected by an electric and magnetic field.
• It has a negative charge of
• $charge=1.602\times10^{-19} coulombs$
  

$mass={1\over 1837}\times 9.107\times 10^{-28}g$

Protons:

• Discovered by Goldstein.
• Depicted first as positive rays because it seemed to emerge from the anode.
• Mass of a proton is

 $1.670 \times 10^{- 24}g$

$Charge=1.602\times 10^{-19} coulombs$​

Explanation:

• Rutherford's discovery led to the discovery of nucleus.
• He found out that most of the mass of the nucleus is situated in its centre and contains the positively charged particles protons.
• The atom is otherwise empty and as electrons have negligible mass, the mass of an atom should be equal to the sum of mass of protons present in it.
• However, it was seen that in Helium, there are only two protons, so its mass should be twice the mass of each proton = $2\times 1.008 a.m.u$.
• Experimental results revealed that it has a mass of 4.003a.m.u.
• Hence, it was concluded that the nucleus has particles containing no charge but mass almost equal to that of a proton.
• This was established by scientist James chadwick in 1932.

Additional Information

Rutherford's gold foil experiment: 

• He discovered the atomic nucleus and gave us an atomic model.
• He directed alpha particles towards a metal sheet.
• He saw that most of the alpha particles, which are positively charged particles, are not getting deflected.
• Most of the alpha particles emerged undeflected.
• Therefore, he concluded that most of the mass of the nucleus is situated in its centre and contains the positively charged particles protons.
• Electrons revolve around the nucleus in certain orbits.

• Alkenes, in organic chemistry, are the unsaturated hydrocarbons which at least contain one carbon-carbon double bond. They are more reactive than alkanes, burn with a sooty and smoky flame which is yellow in color. This indicates incomplete combustion due to the presence of carbon-carbon double bond.
• Alkanes are the saturated hydrocarbons and burn with a blue flame.

The correct answer is Option 3 i.e. The judiciary​

• The Judiciary is empowered to administer justice and provide a mechanism for the resolution of legal disputes.
• The supreme court  is the highest court in India

The correct answer is the 73rd Constitutional Amendment Act.

• The 73rd Constitutional Amendment Act of 1992 gave constitutional recognition to the Panchayats by adding a new schedule 11 and new part IX to the Indian Constitution.
• The 74th Constitutional Amendment Act of 1992 gave constitutional recognition to the Municipalities by adding a new schedule 12 and new part IX-A to the Indian Constitution.
• The Constitution (75th Amendment) Act 1994 provides for setting up of State-level Rent Tribunals to exclude the jurisdiction of all courts, except that of the Supreme Court, under Article 136 of the Constitution.
• The Constitution (72nd Amendment) Act, 1992 to make temporary provision for the determination of the number of seats reserved for the Scheduled Tribes in the State assembly of Tripura, until the re-adjustment of seats is made on the basis of the first census after the year 2000 under article 170 of the Constitution.

• The excretory system in a human body is responsible for the removal of unnecessary and excess materials from the body fluids to prevent the body from any damage and to help maintain the internal chemical homeostasis.
• It comprises of ureters, kidneys, urinary bladder, and urethra.

• Diffusion is the process by which substance like carbon dioxide or oxygen can move across the cell membrane.
• Plasmolysis is the process during which the cells lose water in a hypertonic solution.
• Sedimentation is the process of settling out of the particles from the suspension in water to form sediment.
• Transpiration is a process through which water moves through a plant and evaporates from its aerial parts.

• In November 2017, Indian Government approved setting up of ‘Pradhan Mantri Mahila Shakti Kendras’ in 115 most backward districts of the country.
• This would be done through a new scheme which will reach out to rural women and facilitate nutrition, health, digital literacy, employment, and skill development.

• Researchers from Columbia University Medical Centre in the United States of America have converted a natural bacterial immune system into the world’s smallest microscopic data recorder.
• They modified an ordinary laboratory strain of ubiquitous human gut microbe Escherichiacoli (E.Coli), a bacterium which enabled it to record the time-stamp events and their interactions with the environment.

• As per RBI in October 2017, Gross Non-Performing Assets (GNPA) ratio for NBFCs increased to 5 percent till March 2017.
• Due to the deterioration in the asset quality of NBFCs, the GNPA ratio increased from 4.5% in 2016 to 5.0% in 2017.
• Still, there asset quality remained better than that of the banks. The GNPA ratio for scheduledcommercial banks increased from 8.4% to 9.6%.
• The Net NPA ratio for NBFCs declined from 2.5% to 2.3%.

• On 5 January 2018, LokSabha passed High Court and Supreme Court Judges (Salaries and Conditions of Service) Amendment Bill, 2017.
• The Bill seeks to amend SC Judges (Salaries and Conditions of Service) Act, 1958 and High Court Judges (Salaries and Conditions of Service) Act, 1954.

Given:-

Speed of sound waves = 1000m/s