Punjab State Board PSEB 6th Class Maths Book Solutions Chapter 3 Playing with Numbers MCQ Questions with Answers.

## PSEB 6th Class Maths Chapter 3 Playing with Numbers MCQ Questions

Multiple Choice Questions

Question 1.

Which number is a factor of every, number?

(a) 0

(b) 1

(c) 2

(d) 3.

Answer:

(b) 1

Question 2.

How many even numbers are prime?

(a) 1

(b) 2

(c) 3

(d) 4.

Answer:

(a) 1

Question 3.

The smallest composite number is:

(a) 1

(b) 2

(c) 3

(d) 4.

Answer:

(d) 4.

Question 4.

Which of the following number is a perfect number?

(a) 8

(b) 6

(c) 12

(d) 18.

Answer:

(b) 6

Question 5.

Which of the following is not a multiple of 7?

(a) 35

(b) 48

(c) 56

(d) 91.

Answer:

(b) 48

Question 6.

Which of the following is not a factor of 36?

(a) 12

(b) 6

(c) 9

(d) 8.

Answer:

(d) 8.

Question 7.

The number of prime numbers upto 25 are:

(a) 9

(b) 10

(c) 8

(d) 12.

Answer:

(a) 9

Question 8.

Which mathematician gave the method to find prime and composite numbers?

(a) Aryabhatta

(b) Ramayan

(c) Eratosthenes

(d) Goldbach.

Answer:

(c) Eratosthenes

Question 9.

The statement “Every even number greater than 4 can be expressed as the sum of two odd prime numbers” is given by:

(a) Goldbach

(b) Eratosthenes

(c) Aryabhatta

(d) Ramanujan.

Answer:

(a) Goldbach

Question 10.

Which of the following is a prime number?

(a) 221

(b) 195

(c) 97

(d) 111.

Answer:

(c) 97

Question 11.

Which of the following number is divisible by 4?

(a) 52369

(b) 25746

(c) 21564

(d) 83426.

Answer:

(c) 21564

Question 12.

Which of the following is not true?

(a) If a number is factor of two numbers then it is also factor of their sum.

(b) If a number is factor of two numbers then it is also factor of their difference.

(c) 15 and 24 are co-prime to each other.

(d) 1 is neither prime nor composite.

Answer:

(c) 15 and 24 are co-prime to each other.

Question 13.

Which of the following pair is co-prime?

(a) (12, 25)

(b) (18, 27)

(c) (25, 35)

(d) (21, 56).

Answer:

(a) (12, 25)

Question 14.

Which of the following number is divisible by 8?

(a) 123568

(b) 412580

(c) 258124

(d) 453230.

Answer:

(a) 123568

Question 15.

Prime factorisation of 84:

(a) 2 × 2 × 3 × 2 × 7

(b) 7 × 2 × 3 × 3

(c) 2 × 3 × 7 × 2

(d) 3 × 2 × 3 × 2 × 7.

Answer:

(c) 2 × 3 × 7 × 2

Question 16.

H.C.F. of 25 and 45 is:

(a) 15

(b) 5

(c) 225

(d) 135.

Answer:

(b) 5

Question 17.

If L.C.M. of two numbers is 36 then which of the following can not be their H.C.F.?

(a) 9

(b) 12

(c) 8

(d) 18.

Answer:

(c) 8

Question 18.

The L.C.M. of two co-prime numbers is 143. If one number is 11 then find other number.

(a) 132

(b) 154

(c) 18

(d) 13.

Answer:

(d) 13.

Question 19.

Find the greatest number which divides 145 and 235 leaving the remainder 1 in each case.

(a) 24

(b) 18

(c) 19

(d) 17.

Answer:

(b) 18

Question 20.

The greatest 4 digit number which is divisible by 12,15 and 20.

(a) 9990

(b) 9000

(c) 9960

(d) 9999.

Answer:

(c) 9960

Question 21.

Which of the following is a prime number?

(a) 23

(b) 51

(c) 39

(d) 26.

Answer:

(a) 23

Question 22.

Which of die following is a prime number?

(a) 32

(b) 30

(c) 31.

(d) 33.

Answer:

(c) 31.

Question 23.

Which of the following is a composite number?

(a) 12

(b) 19

(c) 29

(d) 31.

Answer:

(a) 12

Question 24.

Which of the following is an even number?

(a) 13

(b) 15

(c) 16

(d) 19.

Answer:

(c) 16

Question 25.

Which of the following is an odd number?

(a) 12

(b) 13

(c) 14

(d) 20.

Answer:

(b) 13

Fill in the blanks:

Question 1.

…………… is an even prime number?

Answer:

2

Question 2.

…………… is the greatest prime number between 1 and 10.

Answer:

7

Question 3.

……………. is neither prime nor composite number.

Answer:

1

Question 4.

A number which has only two factors is called a …………….. number.

Answer:

prime number

Question 5.

A number which has more than two factors is called a ……………… number.

Answer:

composite number

Write True/False:

Question 1.

The sum of three odd number is even. (True/False)

Answer:

False

Question 2.

All prime numbers are odd. (True/False)

Answer:

False

Question 3.

All even numbers are composite numbers. (True/False)

Answer:

False

Question 4.

1 neither prime nor composite. (True/False)

Answer:

True

Question 5.

If a number is factor of two numbers then it is also factor of their sum. (True/False)

Answer:

True