model 1 basic number system Section-Wise Topic Notes With Detailed Explanation And Example Questions

Question : 1

There are just two ways in which 5 may be expressed as the sum of two different positive (non-zero) integers, namely 5 = 4 + 1 = 3 + 2. In how many ways, 9 can be expressed as the sum of two different positive (non-zero) integers?

a) 3

b) 4

c) 5

d) 6

Question : 2

P and Q are two positive integers such that PQ = 64. Which of the following cannot be the value of P + Q?

a) 16

b) 20

c) 35

d) 65

Question : 3

If n is an integer between 20 and 80, then any of the following could be n+7 except

a) 47

b) 58

c) 84

d) 88

Question : 4

$√2$ is a/an

a) rational number

b) natural number

c) irrational number

d) integer

Question : 5

The number $π$ is

a) a fraction

b) a recurring decimal

c) a rational number

d) an irrational number

Question : 6

Every rational number is also

a) an integer

b) a real number

c) a natural number

d) a whole number