CBSE Class 6 Mathematics Prime Time MCQs Set I

Question. Leap years occur in years that are multiples of
(a) 2
(b) 4
(c) 5
(d) 10

Answer: B

Question. Which of the following is a prime number?
(a) 8
(b) 12
(c) 7
(d) 15

Answer: C

Question. Two numbers are co-prime if they have no common factor other than
(a) 2
(b) 5
(c) 1
(d) 0

Answer: C

Question. Which of these is a twin prime pair?
(a) 29 and 31
(b) 21 and 23
(c) 33 and 35
(d) 2 and 4

Answer: A

Question. Method used to find prime numbers by crossing out multiples is
(a) Jump game
(b) Sieve of Eratosthenes
(c) Idli method
(d) Factor tree

Answer: B

Question. Which of these numbers is not divisible by 4?
(a) 24
(b) 32
(c) 36
(d) 42

Answer: D

Question. Numbers having more than two factors are called
(a) Prime numbers
(b) Composite numbers
(c) Safe numbers
(d) Odd numbers

Answer: B

Question. Which of the following is a common multiple of 3 and 5?
(a) 6
(b) 9
(c) 15
(d) 12

Answer: C

Question. First few prime numbers are 2, 3, 5 and
(a) 4
(b) 9
(c) 7
(d) 1

Answer: C

Question. What is the smallest number divisible by all numbers from 1 to 10?
(a) 100
(b) 360
(c) 2520
(d) 1230

Answer: C

Question. Prime numbers between 21 and 30 are 23 and
(a) 25
(b) 27
(c) 29
(d) 21

Answer: C

Question. Which number is a perfect square and also a composite number?
(a) 2
(b) 5
(c) 9
(d) 13

Answer: C

Question. Pairs of primes with a difference of 2 are called
(a) Best friends
(b) Twin primes
(c) Co-primes
(d) Simple primes

Answer: B

Question. Which of these numbers will fail the divisibility test for 2?
(a) 16
(b) 24
(c) 31
(d) 48

Answer: C

Question. For co-prime numbers, the first common multiple is their
(a) Sum
(b) Difference
(c) Product
(d) Factor

Answer: C

Question. Which of these numbers is neither prime nor composite?
(a) 0
(b) 1
(c) 7
(d) 6

Answer: B

Question. If the last two digits are divisible by 4, the whole number is divisible by
(a) 2
(b) 4
(c) 8
(d) 10

Answer: B

Question. In the prime sieve method, which number is crossed out first after 2?
(a) 3
(b) 5
(c) 4
(d) 6

Answer: C

Question. 3 and 5 are examples of
(a) Composite numbers
(b) Twin primes
(c) Safe pairs
(d) Even primes

Answer: B