Chapter-5 Prime Time — Online MCQ Test
MATHS · CLASS 6th · Andhra State Board
Practice Chapter-5 Prime Time with a free chapter-wise online MCQ test.
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.
Chapter-5 Prime Time — Important Questions & Answers
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.
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.
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).
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.
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.
91 = 7 × 13, 93 = 3 × 31, 95 = 5 × 19, but 97 has no factors other than 1 and 97.