Challenge Questions and Answers

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Q 1
Two trains travel in opposite directions with speeds of 55 kmph and 49 kmph respectively. Find their relative speed.

A)   52 kmph

B)   73 kmph

C)   104 kmph

D)   6 kmph


Correct Option - C

ExplanationWhen two trains travel in opposite directions, relative speed = sum of their speeds = 55+49 = 104 kmph

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Q 2
Find the odd one out. 7, 17, 27, 37, 47

A)   17

B)   27

C)   37

D)   47


Correct Option - B

ExplanationExcept 27, all other numbers are prime numbers.

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Q 3
If 14 men can complete a task in 10 days, how many days will 7 men take to complete the same task?

A)   5

B)   12

C)   20

D)   21


Correct Option - C

ExplanationMen and time are inversely proportional. No. of days = 10*(14/7) = 20

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Q 4
A clock when seen through a mirror shows 5:10. What is the correct time?

A)   6:50

B)   7:10

C)   6:40

D)   7:50


Correct Option - A

ExplanationSince the hour hand is between 5 and 6 in the mirror, it should be between 6 and 7 in the clock. The correct time is 6:50.

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Q 5
9²*9³

A)   9^6

B)   9^5

C)   9^23

D)   9^1


Correct Option - B

Explanation9²*9³ = 9^(2+3) = 9^5

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Q 6
A fair die is rolled. Find the probability of getting an even number.

A)   1/2

B)   1/3

C)   1/4

D)   1/6


Correct Option - A

ExplanationS = {1,2,3,4,5,6} n(S) = 6 E = {2,4,6} n(E) = 3 P(E) = 3/6 = 1/2

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Q 7
How many months have 31 days?

A)   8

B)   7

C)   6

D)   5


Correct Option - B

ExplanationJanuary, March, May, July, August, October, December

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