Find MCQs for Class 9 Maths Chapter 1 on Number System with answers. These questions follow the CBSE (2024-2025) and NCERT guidelines. They are online and match the current exam format. We also offer clear explanations for some to help you grasp the ideas better. Practicing these MCQs will enhance your problem-solving abilities and self-assurance. Don’t forget to look at the Important Questions for Class 9 Maths as well.
Class 9 Maths Number System MCQs with Solutions
Q. Which of the following is a prime number?
A) 12
B) 17
C) 28
D) 33
Solution: B) 17
Q. Which of the following is a composite number?
A) 2
B) 3
C) 4
D) 5
Solution: C) 4
Q. The number 0 is a:
A) Natural number
B) Whole number
C) Neither natural nor whole number
D) Both natural and whole number
Solution: B) Whole number
Q. Which of the following is an irrational number?
A) √9
B) √16
C) √2
D) √25
Solution: C) √2
Q. Which property states that a + b = b + a for any two real numbers a and b?
A) Commutative property of addition
B) Associative property of addition
C) Distributive property
D) Identity property of addition
Solution: A) Commutative property of addition
Q. What is the smallest prime number?
A) 0
B) 1
C) 2
D) 3
Solution: C) 2
Q. Which of the following is a terminating decimal?
A) 1/3
B) 1/4
C) 1/5
D) 1/7
Solution: B) 1/4
Q. What is the value of √81?
A) 7
B) 8
C) 9
D) 10
Solution: C) 9
Q. Which property states that a × (b + c) = (a × b) + (a × c)?
A) Commutative property of multiplication
B) Associative property of multiplication
C) Distributive property
D) Identity property of multiplication
Solution: C) Distributive property
Q. Which of the following is a co-prime pair?
A) (8, 12)
B) (9, 15)
C) (6, 10)
D) (4, 6)
Solution: B) (9, 15)
Q. The number 1 is a:
A) Prime number
B) Composite number
C) Neither prime nor composite
D) Both prime and composite
Solution: C) Neither prime nor composite
Q. What is the value of 5/0?
A) 0
B) 5
C) Undefined
D) 1
Solution: C) Undefined
Q. Which of the following is a rational number?
A) √3
B) √4
C) √5
D) √6
Solution: B) √4
Q. What is the LCM of 6 and 8?
A) 12
B) 14
C) 16
D) 18
Solution: C) 16
Q. Which property states that a × (b × c) = (a × b) × c?
A) Commutative property of multiplication
B) Associative property of multiplication
C) Distributive property
D) Identity property of multiplication
Solution: B) Associative property of multiplication
Q. What is the value of (-1) × (-1)?
A) 0
B) 1
C) -1
D) Undefined
Solution: B) 1
Q. Which of the following is a prime factor of 24?
A) 2
B) 3
C) 4
D) 5
Solution: A) 2
Q. What is the value of 0/5?
A) 0
B) 1
C) 5
D) Undefined
Solution: A) 0
Q. Which of the following is an even number?
A) 13
B) 14
C) 15
D) 16
Solution: B) 14
Q. Which property states that a × 0 = 0?
A) Commutative property of multiplication
B) Associative property of multiplication
C) Distributive property
D) Zero property of multiplication
Solution: D) Zero property of multiplication
Q. What is the value of 3/0?
A) 0
B) 3
C) Undefined
D) Infinity
Solution: C) Undefined
Q. Which of the following is an odd number?
A) 12
B) 13
C) 14
D) 15
Solution: B) 13
Q. What is the value of 7 × 0?
A) 0
B) 7
C) Undefined
D) 1
Solution: A) 0
Q. Which property states that a + 0 = a for any real number a?
A) Commutative property of addition
B) Associative property of addition
C) Identity property of addition
D) Distributive property
Solution: C) Identity property of addition
Q. What is the value of (-1) × 0?
A) 0
B) -1
C) 1
D) Undefined
Solution: A) 0
Q. Which property states that a × 1 = a for any real number a?
A) Commutative property of multiplication
B) Associative property of multiplication
C) Identity property of multiplication
D) Distributive property
Solution: C) Identity property of multiplication
Q. What is the value of 0 × (-5)?
A) 0
B) 5
C) -5
D) Undefined
Solution: A) 0
Q. Which property states that a × b = b × a for any two real numbers a and b?
A) Commutative property of multiplication
B) Associative property of multiplication
C) Distributive property
D) Identity property of multiplication
Solution: A) Commutative property of multiplication
Q. What is the value of 0/0?
A) 0
B) 1
C) Undefined
D) Infinity
Solution: C) Undefined
Q. Which property states that a + (b + c) = (a + b) + c?
A) Commutative property of addition
B) Associative property of addition
C) Distributive property
D) Identity property of addition
Solution: B) Associative property of addition
