Chapter Exam

Chapter-5 Prime Time — Online MCQ Test

Q: What is a factor of 24?

Answer: A. 6 — 6 divides 24 evenly (24 ÷ 6 = 4), making it a factor of 24.

Q: Which of the following is a multiple of 5?

Answer: B. 35 — 35 = 5 × 7, so 35 is a multiple of 5.

Q: If a number is divisible by 10, it must also be divisible by ___.

Answer: B. 2 and 5 — Numbers divisible by 10 end in 0, making them divisible by both 2 and 5 (factors of 10).

Q: If LCM(a, b) = 24 and HCF(a, b) = 4, and one number is 8, what is the other number?

Answer: C. 12 — Using the formula: a × b = HCF × LCM, we get 8 × b = 4 × 24, so b = 12.

Q: Among 91, 93, 95, and 97, which is a prime number?

Answer: D. 97 — 91 = 7 × 13, 93 = 3 × 31, 95 = 5 × 19, but 97 has no factors other than 1 and 97.

MATHS · Grade 6 · CBSE(NCERT)

Practice Chapter-5 Prime Time with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 6 MATHS. This chapter covers: factors - multiples - prime numbers - composite numbers - HCF - LCM - divisibility rules - twin primes. AI-generated questions from basic to board-exam level, with instant results and explanations.

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10 random questions from this chapter (mixed difficulty)
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Chapter-5 Prime Time — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 6 MATHS — Chapter-5 Prime Time, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is a factor of 24?

A. 6 ✓
B. 7
C. 5
D. 9

Answer: A. 6
6 divides 24 evenly (24 ÷ 6 = 4), making it a factor of 24.

Which of the following is a multiple of 5?

A. 23
B. 35 ✓
C. 17
D. 41

Answer: B. 35
35 = 5 × 7, so 35 is a multiple of 5.

If a number is divisible by 10, it must also be divisible by ___.

A. 3 and 7
B. 2 and 5 ✓
C. 4 and 6
D. 8 and 9

Answer: B. 2 and 5
Numbers divisible by 10 end in 0, making them divisible by both 2 and 5 (factors of 10).

If LCM(a, b) = 24 and HCF(a, b) = 4, and one number is 8, what is the other number?

A. 6
B. 10
C. 12 ✓
D. 16

Answer: C. 12
Using the formula: a × b = HCF × LCM, we get 8 × b = 4 × 24, so b = 12.

Among 91, 93, 95, and 97, which is a prime number?

A. 91
B. 93
C. 95
D. 97 ✓

Answer: D. 97
91 = 7 × 13, 93 = 3 × 31, 95 = 5 × 19, but 97 has no factors other than 1 and 97.

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