CBSE Class 9 Maths Number Systems MCQs Set A

Question: If √2 = 1.414 then the value of 5 + √2 / 5 − √2
(a) 1.787
(b) 1.828
(c) 1.525
(d) 1.326

Answer: 1.787

Question:  Rational number 3/40 is equal to:
(a) 0.75
(b) 0.12
(c) 0.012
(d) 0.075

Question: A rational number between 3 and 4 is:
(a) 3/2
(b) 4/3
(c) 7/2
(d) 7/4

Question: A rational number between 3/5 and 4/5 is:
(a) 7/5
(b) 7/1
(c) 3/10
(d) 4/10

Question: A rational number between 1/2 and 3/4 is:
(a) 2/5
(b) 5/8
(c) 4/3
(d) 1/4

Question: Which one of the following is not a rational number:
(a) √2
(b) 0
(c) √4
(d) √-16

Question: Which one of the following is an irrational number:
(a) √4
(b) 3 √8
(c) 100
(d) - √0.64

Question: Decimal representation of 1/5 is :
(b) 0.5
(c) 0.02
(d) 0.002

Question: 8 , 3/8  in decimal form is:
(a) 3.35
(b) 3.375
(c) 33.75
(d) 337.5

Question: 5/6 in the decimal form is: 

Question: Decimal representation of rational number 8/27 is: 

Question: The rationalsing factor of a² + ab + b² is
a) a – b
b) a + b
c) a² – b²
d) a² + b²

Answer: a – b

Question: The value of (3° – 4°) × 5² is
a) 0
b) none
c) 25
d) – 25

Answer: 0

Question: The solution of 3^3x-5 = 1/9^{x is}
a) 1
b) 5
c) 7/3
d) 5/2

Answer: 1

Question: The value of [(-2)^(-2)]^(-3) is
a) 64
b) cannot be determined
c) 32
d) none of these

Answer: 64

Question: (16/81)^3/4
a) 8/27
b) 9/2
c) 2/9
d) 27/8

Answer: 8/27

Question: √2 - 1÷√ 2+ 1
a) 1/4
b) 4
c) 2
d) None of these

Answer: 1/4

Question: Simplify (32)^-2/5 ÷ (125) ^-2/3
a) 25/4
b) 5/2
c) 2/5
d) 4/25

Answer: 25/4

Question: The value of x + x (x^x) when x = 2 is
a) 10
b) 18
c) 16
d) 36

Answer: 10

Question: When simplified, (x^–1 + y^–1)–1 is equal to
a) xy/x+y
b) x+y
c) xy
d) None of these

Answer: xy/x+y

Question: The standard form of 15240000 is
a) 1.524 × 10⁷
b) 15.24 × 10⁷
c) 1.524 × 10⁶
d) 1.524 × 10⁸

Answer: 1.524 × 10⁷

Question: The value of (512)^-2/9 is
a) 1/4
b) 2
c) 1/2
d) 4

Answer: 1/4

Question: Which one of the following is a rational number:
(a) √3
(b) √2
(c) 0
(d) √5

Question: 0.6666 in p/q form is:
(a) 6/99
(b) 2/3
(c) 3/5
(d) 1/66

Question: 4 1/8 in decimal form is:
(a) 4.125
(b) 4.15
(c) 4.15
(d) 0.415

Question: The value of (3+√3)(3-√3)is:
(a) 0
(b) 6
(c) 9
(d) 3

Question: The value of ( √5+√2)² is:
(a) 7+2√5
(b) 1+5√2
(c) 7 + 2√10
(d) 7- 2√10

Question: The value of ( √5+√2) ( √5-√2) is:
(a) 10
(b) 7
(c) 3
(d) √3

Question: The value of (3+√3)(2+√2) is:
(a) 6 +3√2+2√3+√6
(b) 3 +3√2+3√3+6
(c) 6-3√2-2√3-√6
(d) 6-3√2+2√3-√6

Question: The value of (√11+√7) (√11-√7)  is
(a) 4
(b) – 4
(c) 18
(d) – 18

Question: The value of (5+√5)(5-√5) is :
(a) 0
(b) 25
(c) 20
(d) – 20

Question: On rationalizing the denominator of 1/√7 , we get
(a) 7
(b) √7/7
(c) -√7/7
(d) 7

Question: An irrational number is
a) a nonterminating and non-repeating decimal
b) a nonterminating and repeating decimal
c) a terminating and non-repeating decimal
d) a terminating and repeating decimal