Exponents and Powers MCQ Questions Class 7 Maths Chapter 13
NCERT MCQ Questions for Class 7 Maths Chapter 13 Exponents and Powers. Exponents and Powers MCQ Questions with Answers from Class 7 Maths
Exponents and Powers MCQ Questions Class 7 Maths Chapter 13
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Chapter – 13
Exponents and Powers
Question 1:
Express 64 as a power 2.
(a) 28
(b) 26
(c) 25
(d) 24
Ans:
We have 64 = 2×2×2×2×2×2
64 = 26 (b)
Question 2:
Which one is greater?
(a) 23
(b) 32
(c) 42
(d) 53
Ans:
(a) 23 = 2×2×2 = 8, (b) 32 = 3×3 = 9
(c) 42 = 4×4 = 16, (d) 53 = 5×5×5 = 125
(d) 53 is greater than all option.
Question 3:
Express the 36 as a product of powers of prime factors.
(a) 22 × 32
(b) 24 × 38
(c) 22 × 35
(d) 32 × 23
Ans:
36 = 2×18 = 2×2×9
= 2×2×3×3
36 = 22 × 32 (a)
Question 4:
Express 81 as a power 3.
(a) 36
(b) 35
(c) 34
(d) 33
Ans:
We have 81 = 3×3×3×3
81 = 34 (c)
Question 5:
Find the value of 83
(a) 64
(b) 216
(c) 512
(d) 612
Ans:
83 = 8 × 8 × 8
= 64 × 8
= 512 (c)
Question 6:
Express the following in exponential form.
a×a×a×c×c×d×d×d×d
(a) a3 × c2 × d4
(b) d2 × a3 × c
(c) d2 × a2 × c
(d) c3 × d4
Ans:
a×a×a×c×c×d×d×d×d
= a3 × c2 × d4 (a)
- In case you have missed:- Previous Chapter MCQ Questions
Question 7
Simplify 72 × 24
(a) 784
(b) 786
(c) 484
(d) 581
Ans:
72 × 24 = 7×7×2×2×2×2
= 49 × 16
= 784 (a)
Question 8:
Simplify (-2)3 × (-10)2
(a) 800
(b) -800
(c) -400
(d) -500
Ans:
(-2)3 × (-10)2
= (-2) × (-2) × (-10) × (-10)
= -800 (b)
Question 9:
Express the following terms in the exponential form (-2m)5
(a) (-m)3 (-2)5
(b) (-m)5 (-2)
(c) (-2)3 × (-m)3
(d) (-2)5 × m5
Ans:
We have (-2m)5 = (-2) × (-2) × (-2) × (-2) × (-2) × m × m × m × m × m
= (-2)5 × m5 (d)
Question 10:
Express each of the following as a product of powers of their prime factors: 120
(a) 52 × 32
(b) 22 × 33
(c) 3 × 5 × 23
(d) 3 × 52 × 2
Ans:
We have = 120 = 60 × 2 = 30 × 2 × 2
= 3 × 10 × 2 × 2
= 3 × 5 × 2 × 2 × 2
= 3 × 5 × 23 (c)
Question 11:
Write exponential form 4×4×4 taking as base 2
(a) 24
(b) 25
(c) 28
(d) 26
Ans:
4×4×4 = 2×2×2×2×2×2
= 26
Question 12:
Simplify the following and write the answer in the exponential form.
(36/34) × 32 =?
(a) 34
(b) 38
(c) 32
(d) 38
Ans: 3×3×3×3×3×3/3×3×3×3 ×3×3 = 34 (a)
Question 13:
Simplify 32 × 103 × 42 × 34/12 × 64 × 81
(a) 29.4
(b) 37.5
(c) 39.5
(d) 38.5
Ans:
Question 14:
Express 90, 00, 000 in the standard form.
(a) 9 × 104
(b) 9 × 106
(c) 9 × 103
(d) 9 × 105
Ans:
90 × 00 × 000 = 9×10×10×10×10×10×10
= 9×106 (b)
Question 15:
Find the number from of the following expanded forms. 9 × 104 + 6 × 103 + 5 × 102 + 7 × 10
(a) 96570
(b) 69570
(c) 57960
(d) 76590
Ans:
9×104 + 6×103 + 5×102 + 7×10
90000 + 6000 + 500 + 70
= 96570 (a)
- In case you have missed:- Next Chapter MCQ Questions
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given answer of question 13 is wrong
3x3x10x10x10x4x4x3x3x3x3/12x64x81
Yes