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Class 7 Maths Chapter 10 Practice Question Answers - Exponents and Powers

Q1. Evaluate: 2³
(a) 2
(b) 4
(c) 8
(d) 6
Ans: (c)

View Answer

Sol: 2³
= 2 × 2 × 2
= 8.

Q2. Simplify: 5² × 5³
(a) 10
(b) 25
(c) 3125
(d) 625
Ans: (c)

View Answer

Sol: 5² × 5³
Class 7 Maths Chapter 10 Practice Question Answers - Exponents and Powers

Q3. Evaluate: 4⁰
(a) 0
(b) 1
(c) 4
(d) 2
Ans: (b)

View Answer

Sol: Any non-zero number raised to the power of 0 is 1. So, 4⁰ = 1.

Q4. Simplify: (2²)³
(a) 6
(b) 8
(c) 64
(d) 16
Ans: (c)

View Answer

Sol: (2²)³
Class 7 Maths Chapter 10 Practice Question Answers - Exponents and Powers = 64.

Q5. Evaluate: 10^(-2)
(a) 100
(b) 0.01
(c) 0.1
(d) 0.001
Ans: (b)

View Answer

Sol: 10^(-2)
= 1 / 10² = 1 / 100
= 0.01.

Q6. Simplify: (3²) × (3⁴)
(a) 9
(b) 81
(c) 243
(d) 729
Ans: (d)

View Answer

Sol: (3²) × (3⁴)
Class 7 Maths Chapter 10 Practice Question Answers - Exponents and Powers

Q7. Evaluate: 1⁵
(a) 5
(b) 1
(c) 0
(d) 6
Ans: (b)

View Answer

Sol: Any non-zero number raised to the power of 0 is 1. So, 1⁵ = 1.

Q8. Simplify: 6¹ × 6²
(a) 12
(b) 18
(c) 216
(d) 72
Ans: (c)

View Answer

Sol: 6¹ × 6²
Class 7 Maths Chapter 10 Practice Question Answers - Exponents and Powers

Q9. Evaluate: 0³
(a) 0
(b) 1
(c) 3
(d) 27
Ans: (a)

View Answer

Sol: Any number (except 0) raised to the power of 0 is 1. However, 0^0 is undefined. So, 0³ = 0.

Q10. Simplify: (2³) ÷ (2²)
(a) 1/2
(b) 2
(c) 4
(d) 8
Ans: (b)

View Answer

Sol: (2³) ÷ (2²)
Class 7 Maths Chapter 10 Practice Question Answers - Exponents and Powers

Q11. Evaluate: 5^(-3)
(a) -125
(b) 125
(c) -25
(d) 1/125
Ans: (d)

View Answer

Sol: 5^(-3)
= 1 / 5³
= 1 / 125.

Q12. Simplify: (7²) × (7^(-1))
(a) 1/49
(b) 7
(c) 49
(d) 1/7
Ans: (d)

View Answer

Sol: (7²) × (7^(-1))
Class 7 Maths Chapter 10 Practice Question Answers - Exponents and Powers

Q13. Evaluate: (-3)⁴
(a) -81
(b) 81
(c) -27
(d) 27
Ans: (b)

View Answer

Sol: (-3)⁴
= (-3) × (-3) × (-3) × (-3)
= 81.

Q14. Simplify: (2^(-3)) × (2^(-2))
(a) 1/4
(b) 1/8
(c) 1/16
(d) 1/64
Ans: (c)

View Answer

Sol: (2^(-3)) × (2^(-2))
Class 7 Maths Chapter 10 Practice Question Answers - Exponents and Powers

Q15. Evaluate: (-2)³
(a) -8
(b) -2
(c) 8
(d) 2
Ans: (a)

View Answer

Sol: (-2)³
= (-2) × (-2) × (-2)
= -8.

Q16. Simplify: (3^(-2)) ÷ (3^(-3))
(a) 1/9
(b) 1/6
(c) 1/27
(d) 1/81
Ans: (d)

View Answer

Sol: (3^(-2)) ÷ (3^(-3))
Class 7 Maths Chapter 10 Practice Question Answers - Exponents and Powers

Q17. Evaluate: (-1)⁰
(a) 0
(b) -1
(c) 1
(d) -2
Ans: (c)

View Answer

Sol: Any non-zero number raised to the power of 0 is 1. So, (-1)⁰ = 1.

Q18. Simplify: (4^(-1)) × (4^(-2))
(a) 1/2
(b) 1/16
(c) 1/8
(d) 1/64
Ans: (b)

View Answer

Sol: (4^(-1)) × (4^(-2)) Class 7 Maths Chapter 10 Practice Question Answers - Exponents and Powers

Q19. Evaluate: (-5)²
(a) -25
(b) 25
(c) -10
(d) 10
Ans: (b)

View Answer

Sol: (-5)²
= (-5) × (-5)
= 25.

Q20. Evaluate: (-3)²
(a) -9
(b) 9
(c) -6
(d) 6
Ans: (b)

View Answer

Sol:

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