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 ICAP QAT Questions | Number system


1. Which one of the following is not a prime number?

a) 31

b) 61

c) 71

d) 91

Explanation:

91 is divisible by 7. So, it is not a prime number.


2. What least number must be added to 1056, so that the sum is completely divisible by 23 ?

a) 2

b) 3

c) 18

d) 21


3. Every rational number is a -

a) Whole number

b) Real number

c) Natural number

d) None of the above

Explanation: 

The numbers which can be found on the number line and include both rational and irrational numbers are known as real numbers, e.g., -1.5,√2,0,1,2,3,π.Almost any number which you can imagine is a real number.


4. How many of the following numbers are divisible by 132 ?

264, 396, 462, 792, 968, 2178, 5184, 6336

a) 4

b) 5

c) 6

d) 7


5. Between any two numbers, there are -

a) Two rational numbers

b) No rational number

c) Infinite rational numbers

d) None of the above

Explanation: 

There are infinite rational numbers in between any two numbers.


6. What is the mean of first 10 Prime numbers.

a) 13

b) 12.9

c) 12.3

d) 13.9


7. The largest 4 digit number exactly divisible by 88 is:

a) 9944

b) 9768

c) 9988

d) 8888


8. Which of the following is a prime number ?

a) 33

b) 81

c) 93

d) 97


9. The sum of first five prime numbers is:

a) 11

b) 18

c) 26

d) 28

Explanation:

Required sum = (2 + 3 + 5 + 7 + 11) = 28.


10. The smallest 3 digit prime number is:

a) 101

b) 103

c) 109

d) 113


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