Introduction to Number Systems — test yourself

Which number is a whole number but is not a natural number?

A

10

B

0

C

2

D

1

Which of these is NOT a factor of

24

?

A

12

B

5

C

6

D

8

Which of these numbers is divisible by

5

?

A

1460

B

6021

C

9087

D

832

Which of these is a prime number?

A

25

B

21

C

27

D

23

Which of these is a perfect number?

A

12

B

28

C

16

D

36

Write

64

in exponential form, with base

2

.

A

2^{8}

B

6^{2}

C

2^{6}

D

2^{5}

Which of these numbers is divisible by

9

?

A

4526

B

1234

C

3618

D

2345

What is the standard form of

90

?

A

2 \times 3^{2} \times 5^{2}

B

2^{2} \times 3 \times 5

C

2 \times 3^{2} \times 5

D

2 \times 3 \times 5

What is the H.C.F of

36

and

48

?

A

4

B

144

C

12

D

6

Three bells ring at intervals of

6

minutes,

8

minutes and

12

minutes. They have just rung together. After how many minutes will they next ring together?

A

48

B

576

C

12

D

24

The H.C.F of two numbers is

6

and their L.C.M is

36

. One number is

12

. What is the other?

A

18

B

24

C

72

D

3

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Introduction to Number Systems — test yourself