CBSE Class 6 Mathematics Prime Time MCQs Set B

Question. The factors of a prime number are 1 and
(a) 2
(b) Number itself
(c) 0
(d) 10

Answer: B

Question. Number of even numbers between 58 and 80 is
(a) 10
(b) 11
(c) 12
(d) 13

Answer: A

Question. First few composite numbers are 4, 6, 8 and
(a) 7
(b) 9
(c) 5
(d) 11

Answer: B

Question. The number with unit digit by:
(a) 5
(b) 10
(c) 15
(d) 2

Answer: B

Question. Two numbers are co-prime if they have no common
(a) Even factor
(b) Prime factor
(c) Multiples
(d) Odd factor

Answer: B

Question. What is the smallest prime factor of 56?
(a) 7
(b) 2
(c) 8
(d) 5

Answer: B

Question. Every number bigger than 1 has a
(a) Idli name
(b) Prime factorisation
(c) Zero factor
(d) Twin prime

Answer: B

Question. Sum of the number of primes between 16 to 80 and 90 to 100 is
(a) 20
(b) 18
(c) 17
(d) 16

Answer: C

Question. Two numbers with no common factor other than 1 are
(a) Multiples
(b) Co-prime
(c) Even
(d) Same

Answer: B

Question. How many prime numbers are there between 50 and 100?
(a) 8
(b) 9
(c) 10
(d) 11

Answer: C

Question. In treasure game, a pair of numbers where Jumpy can only use jump size 1 is called
(a) Prime pair
(b) Safe pair
(c) Fast pair
(d) Even pair

Answer: B

Question. What is a prime number?
(a) A number with only two factors
(b) A number with more than two factors
(c) A number divisible by 3
(d) A number divisible by 5

Answer: A

Question. Which of these is divisible by all of 2, 4, 5, 8 and 10?
(a) 572
(b) 2352
(c) 5600
(d) 1111

Answer: C

Question. What is the smallest prime number?
(a) 0
(c) 1
(c) 2
(d) 3

Answer: C

Question. Smallest number whose prime factorisation has three different primes is
(a) 10
(b) 30
(c) 15
(d) 60

Answer: B

Question. The number with unit digit 0 or 5 is divisible by:
(a) 2
(b) 3
(c) 4
(d) 5

Answer: D

Question. Prime factorisation of 63 is
(a) 9 x 7
(b) 3 x 21
(c) 3 x 3 x 7
(d) 7 x 8

Answer: C

Question. What is the 10th number that players say ‘idli-vada’ for?
(a) 60
(b) 75
(c) 90
(d) 150

Answer: C

Question. Pairs of primes with a difference of 2 are called
(a) Double primes
(b) Twin primes
(c) Co-primes
(d) Even primes

Answer: B

Question. The number of common prime factors of 75,60,105 is
(a) 2
(b) 3
(c) 4
(d) 5

Answer: A