class 10 maths chapter 1 mcq 6e

#1. The addition of a rational number and an irrational number is equal to:

(c) Both

(a) rational number

(b) Irrational number

(d) None of the above

#2. For any two positive integers a and b, HCF (a, b) × LCM (a, b) =

(d) a × b

(a) 1

(b) (a × b)/2

(c) a/b

#3. The product of two consecutive integers is divisible by

b) 3

d) 7

a) 2

c) 5

#4. The least number that is divisible by all the numbers from 1 to 5 is:

(a) 70

(b) 60

(c) 80

(d) 90

#5. The least number that is divisible by first five even numbers is

b) 160

c) 80

d) 60

a) 120

#6. Which of the following is not irrational?

(b) (3 – √7)

(a) (3 + √7)

(d) 3√7

(c) (3 + √7) (3 – √7)

#7. The sum or difference of two irrational numbers is always

(c) rational or irrational

(b) irrational

(a) rational

(d) not determined

#8. LCM of the given number ‘x’ and ‘y’ where y is a multiple of ‘x’ is given by

(d) xy

(b) y

(a) x

(c) xy

#9. Two natural numbers whose sum is 85 and the least common multiple is 102 are:

(c) 35 and 55

(a) 30 and 55

(d) 51 and 34

(b) 17 and 68

#10. The multiplication of two irrational numbers is:

(a) irrational number

(d) None

(b) rational number

(c) Maybe rational or irrational