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Class 9 Maths – Chapter 1: Number Systems – 50 MCQs
1. Which of the following is a rational number?
a) √2
b) π
c) 7/3
d) √5
2. The square of any irrational number is:
a) Rational
b) Irrational
c) Whole
d) Natural
3. What is the value of √49?
a) 5
b) 6
c) 7
d) 8
4. The decimal expansion of a rational number is:
a) Non-terminating
b) Repeating
c) Non-repeating
d) Both a and b
5. Which of these is not a real number?
a) 0
b) -3
c) 2i
d) 3.14
6. Which of the following is an irrational number?
a) 1.75
b) √3
c) 3/4
d) 0.125
7. √2 + √3 is:
a) Rational
b) Irrational
c) Integer
d) Whole number
8. The sum of two rational numbers is always:
a) Rational
b) Irrational
c) Natural
d) Integer
9. A non-terminating, non-repeating decimal is always:
a) Rational
b) Integer
c) Irrational
d) Real
10. Which of these numbers is not irrational?
a) √7
b) π
c) 1.414213…
d) 3/5
11. Which number is a perfect square?
a) 36
b) 45
c) 50
d) 20
12. How many rational numbers lie between 1 and 2?
a) One
b) Two
c) Infinite
d) None
13. What type of number is 0?
a) Natural
b) Whole
c) Rational
d) Both b and c
14. Every integer is a:
a) Rational number
b) Irrational number
c) Natural number
d) Real number
15. What is 2√3 × √3 equal to?
a) 6
b) 3
c) 2
d) 9
16. Rational numbers are closed under:
a) Addition
b) Subtraction
c) Multiplication
d) All of these
17. Which of the following is a real number?
a) √5
b) -3
c) 0
d) All of these
18. What is the cube of 2?
a) 4
b) 6
c) 8
d) 12
19. 1.1010010001… is:
a) Rational
b) Irrational
c) Integer
d) Natural
20. A rational number can be expressed in the form:
a) p/q
b) √q
c) q/p
d) p√q
21. The decimal form of 3/4 is:
a) 0.75
b) 0.34
c) 0.7
d) 1.25
22. √0 is equal to:
a) 1
b) 0
c) Not defined
d) -1
23. Between two rational numbers:
a) One rational number exists
b) Finite rational numbers exist
c) Infinite rational numbers exist
d) None
24. Rational number is the set of:
a) Integers
b) Whole numbers
c) Fractions
d) All of these
25. Which one is an integer but not a whole number?
a) 0
b) 5
c) -3
d) 7
26. Which is not a terminating decimal?
a) 1/4
b) 2/5
c) 3/11
d) 1/8
27. √81 is:
a) 7
b) 8
c) 9
d) 10
28. The value of (√5)^2 is:
a) 10
b) 25
c) 5
d) 0
29. Rational number between 1 and 2 is:
a) 2.5
b) 3
c) 1.5
d) 2.1
30. Which is the highest number system?
a) Rational
b) Irrational
c) Real
d) Integer
31. Which is not a rational number?
a) 0
b) √2
c) 4/5
d) 7
32. The number √16 is:
a) 3
b) 4
c) 5
d) 6
33. The product of a rational and an irrational number is always:
a) Rational
b) Irrational
c) Zero
d) Whole
34. What is the square of √6?
a) 6
b) 12
c) 3
d) 36
35. Decimal expansion of 7/8 is:
a) 0.875
b) 0.78
c) 0.7
d) 0.88
36. Which one is a natural number?
a) 0
b) -1
c) 1
d) -3
37. The sum of rational and irrational number is:
a) Rational
b) Irrational
c) Integer
d) Whole
38. What is the cube root of 27?
a) 3
b) 9
c) 6
d) 4
39. Rational number between 2/5 and 3/5 is:
a) 1/2
b) 3/4
c) 4/5
d) 2/3
40. √25 × √36 = ?
a) 150
b) 30
c) 11
d) 20
41. Which of the following is not a perfect square?
a) 16
b) 49
c) 81
d) 50
42. Decimal expansion of 1/3 is:
a) 0.33
b) 0.3
c) 0.333…
d) 3.33
43. Which of the following has a terminating decimal?
a) 1/3
b) 1/11
c) 1/25
d) 1/7
44. Is π rational?
a) Yes
b) No
c) Depends
d) Can’t say
45. Which number lies between 1.1 and 1.2?
a) 1.05
b) 1.15
c) 1.25
d) 1.0
46. The value of 3/10 is:
a) 0.3
b) 3.0
c) 0.33
d) 0.13
47. Rational number equivalent to 0.75 is:
a) 3/4
b) 2/3
c) 1/2
d) 5/6
48. Which of these is not a rational number?
a) 5
b) √2
c) -3
d) 1/7
49. What is 5²?
a) 10
b) 15
c) 25
d) 20
50. What is the result of √100?
a) 9
b) 10
c) 11
d) 12
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