Exponents and powers MCQ Questions Class 8 Maths Chapter 12
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)
- In case you have missed:- Previous Chapter MCQ Questions
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)
- In case you have missed:- Next Chapter MCQ Questions
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