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Chapter-5 Prime Time — Online MCQ Test

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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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.
Which number is a prime number?
  • A. 1
  • B. 4
  • C. 7 ✓
  • D. 9
Answer: C. 7
7 has exactly two factors (1 and 7), making it a prime number.
What is a composite number?
  • A. A number with only one factor
  • B. A number with exactly two factors
  • C. A number with more than two factors ✓
  • D. A number that cannot be divided
Answer: C. A number with more than two factors
A composite number has more than two factors (includes factors other than 1 and itself).
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).
Which number is NOT a factor of 36?
  • A. 6
  • B. 9
  • C. 8 ✓
  • D. 4
Answer: C. 8
36 ÷ 8 = 4.5 (not a whole number), so 8 is not a factor of 36.
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.
A teacher wants to distribute 48 chocolates and 36 candies equally among students with no remainder. The maximum number of students is ___.
  • A. 6
  • B. 8
  • C. 12 ✓
  • D. 18
Answer: C. 12
The maximum number of students equals HCF(48, 36) = 12. Each would get 4 chocolates and 3 candies.
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.
If p and q are twin primes and their product is 143, then p + q = ___.
  • A. 24 ✓
  • B. 26
  • C. 28
  • D. 30
Answer: A. 24
11 × 13 = 143 and 13 - 11 = 2 (twin primes). So p + q = 11 + 13 = 24.
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Chapter-4 Data Handling and Presentation

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Chapter-1 Patterns in Mathematics Chapter-2 Lines and Angles Chapter-3 Number Play Chapter-4 Data Handling and Presentation Chapter-6 Perimeter and Area Chapter-7 Fractions

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