CBSE Class 6 Mathematics Prime Time MCQs Set B

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

Answer: A

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

Answer: B

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

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

Answer: C

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

Answer: C

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

Answer: D

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

Answer: C

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

Answer: A

Question. The number 6 has how many factors?
(a) 2
(b) 3
(c) 4
(d) 5

Answer: C

Question. Which pair of numbers has the greatest common factor of 1?
(a) 12 and 18
(b) 7 and 15
(c) 8 and 16
(d) 10 and 20

Answer: B

Question. Which of the following is not a factor of 56?
(a) 2
(c) 7
(c) 9
(d) 8

Answer: C

Question. 1170 is not divisible by:
(a) 10
(b) 9
(c) 5
(d) 4

Answer: D

Question. Which of the following numbers is divisible by 3?
(a) 14
(b) 21
(c) 25
(d) 27

Answer: B

Question. Which of the following numbers is not divisible by 5?
(a) 15
(b) 25
(c) 30
(d) 32

Answer: D

Question. The number of distinct prime factors of the smadlest 5 -digit number is
(a) 2
(b) 4
(c) 6
(d) 8

Answer: A

Question. What is the prime factorization of 72?
(a) 2 × 2 × 3 × 2 × 3
(b) 6 × 12
(c) 8 × 9
(d) 2 × 36

Answer: A

Question. Which of the following number is the product of exactly three distinct prime number?
(a) 20
(b) 165
(c) 45
(d) 147

Answer: B

Question. The smallest perfect number is
(a) 6
(c) 28
(c) 496
(d) 8128

Answer: A

Question. Which number has the prime factorisation 2 × 2 × 3 × 3?
(a) 18
(b) 36
(c) 72
(d) 12

Answer: B

Question. Which of the following statements is true?
(a) All prime numbers are even
(b) The number 1 is a prime number.
(c) All composite numbers are greater than 1.
(d) The number 2 is a composite number.

Answer: C

Question. What is the largest prime number less than 20?
(a) 19
(b) 18
(c) 17
(d) 16

Answer: A

Question. Which of the following is the smallest prime number greater than 20?
(a) 21
(b) 23
(c) 25
(d) 27

Answer: B

Question. A number is divisible by 5, if it has
(a) Only 0 in its ones place
(b) 0 in its tens place
(c) 0 or 5 in its ones place
(d) 5 in its ones place

Answer: C

Question. How many prime numbers are there between 1 and 10?
(a) 4
(c) 5
(c) 6
(d) 7

Answer: A

Question. Which number is a perfect number?
(a) 6
(b) 12
(c) 28
(d) 36

Answer: C

Question. Prime factorization of 54 is:
(a) 2 × 27
(b) 2 × 3 × 9
(c) 54 × 1
(d) 2 × 3

Answer: D

Question. The sum of two prime numbers is always:
(a) Even
(b) Odd
(c) Prime
(d) None of these

Answer: D

Question. What is the least common multiple (LCM) of 4 and 6?
(a) 8
(b) 12
(c) 18
(d) 24

Answer: B

Question. The number of distinct prime factors of the smallest 5- digit number is
(a) 2
(b) 4
(c) 6
(d) 8

Answer: A

Question. What is the prime factorization of 72?
(a) 2³ × 3²
(c) 2² × 3³
(c) 2⁴ × 3
(d) 2² × 3²

Answer: A

Question. Which of the following pairs is co-prime?
(a) 20 and 24
(b) 5 and 16
(c) 30 and 45
(d) 28 and 35

Answer: B

Question. Three prime numbers less than 20, whose product is 231.
(a) 3, 7 and 11
(b) 3, 5 and 7
(c) 7,11 and 13
(d) None of these

Answer: A

Question. Which of the following numbers is co-prime with 25?
(a) 10
(b) 20
(c) 24
(d) 26

Answer: D

Question. Which of the following numbers are co-prime?
(a) 18 and 35
(b) 16 and 24
(c) 30 and 45
(d) 21 and 49

Answer: A