Class 9 Math Chapter 1 MCQs | Federal Board New Syllabus
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Which of the following numbers is irrational?
- a) 0.75
- b) √2
- c) 1/3
- d) -5
Answer: b) √2
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The decimal representation of a rational number is always:
- a) Terminating
- b) Non-terminating
- c) Non-terminating and repeating
- d) Either terminating or non-terminating repeating
Answer: d) Either terminating or non-terminating repeating
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The product of a rational and an irrational number is:
- a) Always rational
- b) Always irrational
- c) Rational if the rational number is zero
- d) Irrational if the rational number is zero
Answer: c) Rational if the rational number is zero
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Which of the following is a rational number?
- a) π
- b) √3
- c) 0.333… (repeating)
- d) e
Answer: c) 0.333… (repeating)
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The sum of two irrational numbers is:
- a) Always irrational
- b) Always rational
- c) Sometimes rational, sometimes irrational
- d) Never rational
Answer: c) Sometimes rational, sometimes irrational
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Which of the following is an example of a terminating decimal?
- a) 1/3
- b) 1/4
- c) 1/7
- d) 1/9
Answer: b) 1/4
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The decimal expansion of an irrational number is:
- a) Terminating
- b) Non-terminating and repeating
- c) Non-terminating and non-repeating
- d) Terminating and repeating
Answer: c) Non-terminating and non-repeating
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Which of the following sets is closed under addition?
- a) Natural numbers
- b) Whole numbers
- c) Integers
- d) Rational numbers
Answer: d) Rational numbers
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The multiplicative inverse of 5 is:
- a) 5
- b) -5
- c) 1/5
- d) -1/5
Answer: c) 1/5
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Which property is illustrated by the equation a + b = b + a?
- a) Associative property
- b) Commutative property
- c) Distributive property
- d) Identity property
Answer: b) Commutative property
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The number 0 is:
- a) A natural number
- b) A whole number
- c) A rational number
- d) Both b and c
Answer: d) Both b and c
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The additive identity in real numbers is:
- a) 0
- b) 1
- c) -1
- d) None of the above
Answer: a) 0
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The number √16 is:
- a) 4
- b) -4
- c) Both a and b
- d) None of the above
Answer: c) Both a and b
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