Top 10,000+ Aptitude Questions and Answers - 2

 Question: 1

Find out the wrong number in each sequence:
16, 32, 64, 81, 100, 144, 190

(A) 36

(B) 81

(C) 100

(D) 190

View Answer

Ans: D

Each number is the square of a composite number except 190.

Question: 2

Find out the wrong number in each sequence:
22, 33, 69, 99, 121, 279, 594

(A) 594

(B) 279

(C) 121

(D) 33

View Answer

Ans: B

Each number except 279 is a multiple of 11.

Question: 3

Find out the wrong number in each sequence:
10, 14, 28, 32, 64, 68, 132

(A) 28

(B) 32

(C) 68

(D) 132

View Answer

Ans: D

Alternately, we add 4 and double the next.

So, 132 is wrong. It must be ( 68 x 2) i.e., 136.

Question: 4

Find out the wrong number in each sequence:
1, 8, 27, 64, 124, 216, 343

(A) 8

(B) 27

(C) 64

(D) 124

View Answer

Ans: D

The numbers are 13, 23, 33, 43 etc. So, 124, is wrong; it must have been 53 i.e. 125.

Question: 5

Find out the wrong number in each sequence:
105, 85, 60, 30, 0, - 45, - 90

(A) 85

(B) 60

(C) -45

View Answer

Ans: D

Subtract 20, 25, 30, 35, 40, 45 from successive numbers. So 0 is wrong

Question: 6

Find out the wrong number in each sequence:
8, 13, 21, 32, 47, 63, 83

(A) 32

(B) 47

(C) 63

(D) 83

View Answer

Ans: B

Go on adding 5, 8, 11, 14, 17, 20.

So, the numbers 47 is wrong and must be replaced by 46.

Question: 7

Find out the wrong number in each sequence:
125, 123, 120, 115, 108, 100, 84

(A) 84

(B) 100

(C) 115

(D) 123

View Answer

Ans: B

Prime numbers 2, 3, 5, 7, 11, 13 have successively been subtracted. So, 100 is wrong. It must be ( 108 – 11) i.e. 97.

Question: 8

Find out the wrong number in each sequence:
36, 54, 18, 27, 9, 18.5, 4.5

(A) 4.5

(B) 8.5

(C) 18.5

(D) 18

View Answer

Ans: C

The terms are alternately multiplied by 1.5 and divided by 3. However, 18.5 does not satisfy it.

Question: 9

Find out the wrong number in each sequence:
1, 2, 6, 15, 31, 56, 91

(A) 15

(B) 31

(C) 56

(D) 91

View Answer

Ans: D

Add 12, 22, 32, 42, 52, 62. So, 91 is wrong.

Question: 10

Find out the wrong number in each sequence:
5, 16, 6, 16, 7, 16, 9

(A) 6

(B) 7

(C) 8

(D) 9

View Answer

Ans: D

Terms at odd places are 5, 6, 7, 8 etc. and each term at even place is 16. So, 9 is wrong.