# NCERT Book Exponents and powers MCQ Questions Class 8 Maths Chapter 12

## Exponents and powers MCQ Questions Class 8 Maths Chapter 12

#### Exponents and powers

Question 1:

Find 5° =?

(a) 12

(b) 215 = 5°

(c) 5° = 1

(d) 5 = 2

Ans:

5° = 5/5 = 1 = 5° (c)

Question 2:

3-3 =?, Find the value of 3-3

(a) 1

(b) 1/3

(c) 1/9

(d) 1/27

Ans:

3-3 = 1/33 = 1/27 (a)

Question 3:

Find the value of (-5)8 × (-5)-3

(a) (-5)5

(b) (-5)11

(c) 1/(-5)5

(d) (-5)°

Ans:

(-5)8 × (-5)-3 = (-5)8-3 = (-5)5 (a)

Question 4:

Simplify [(-9)4 ÷ (-9)-10] × (-9)-10

(a) 1/-729

(b) 1/27

(c) 6561

(d) 1/6561

Ans:

[(-9)-4/(-9)-10] × (-9)-10

= (-9)-4

= 1/(-9)4 = 1/6561 (d)

Question 5:

Evaluate (-5)-4/(-25)-8

(a) 58

(b) 510

(c) 512

(d) 59

Ans:

(-5)-4/(-25)-8 = (-25)8/(-5)4

= (-5)16/(-5)4 = (-5)12 = 512 (c)

Question 6:

Find (5° + 42) – (22 ÷ (2)

(a) 23

(b) 21

(c) 19

(d) 25

Ans:

(5° + 42) – (22 ÷ (-2))

= (1 + 16) – (4 ÷ (-2))

= 17 + 2

= 19 (c)

Question 7:

Find the value of x. 3x × 3-9 = 3-15 ÷ 38

(a) 14

(b) -14

(c) -15

(d) -23

Ans:

3x × 3-9 = 3-15/38

3x × 3-9 = 3-23

3x = 3-14

x = -14 (b)

Question 8:

Find (3/4)-3

(a) 25

(b) -25

(c) 64/27

(d) 27/64

Ans:

(3/4)-3 = 43/33 = 64/27 (c)

Question 9:

Find the value of (1/2)-3 + (1/3)-2 + (1/5)-3

(a) 142

(b) 144

(c) 146

(d) 188

Ans:

(1/2)-3 + (1/3)-2 + (1/5)-3

= 23 + 32 + 53

= 8 + 9 + 125

= 142

142 (a)

Question 10:

Evaluate {(1/2)-2 – (1/3)-3}-2

(a)  1/529

(b) -529

(c) 1/-529

(d) 1/425

Ans:

{(1/2)-2 – (1/3)-3}-2

= {4 – 27}-2

= {-23}-2

= 1/232

= 1/529 (a)

Question 11:

Find {(-4/5)-2}3

(a) 4096/15625

(b) 15625/4096

(c) -25

(d) +23

Ans:

(-4/5)-6

= (5/-4)6

= 15625/4096 (b)

Question 12:

Express the following numbers in the standard form?

4197000000

(a) 4197×106

(b) 4197×108

(c) 4197×10-3

(d) 4197

Ans:

4197000000 = 4197×1000000

= 4197 × 106 (a)

Question 13:

0.00000009527

(a) -95272

(b) 95274

(c) 9.527×10-8

(d) 9527×108

Ans:

0.00000009527 = 9.527×10-8 (c)

Question 14:

Express the following numbers in usual form.

3.04 × 10-6

(a) 0.00000304

(b) 0.000304

(c) -1/304

(d) 0.0304

Ans:

3.04/1000000 = 0.00000304 (a)

Question 15:

1.0001 × 108

(a) 10010000

(b) 100010000

(c) 10001000

(d) -10001000

Ans:

1.0001×108

= 1.0001 × 100000000

= 100010000 (b)

Here is your solution of Exponents and powers MCQ Questions Class 8 Maths Chapter 12

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Updated: April 11, 2023 — 12:35 pm