Class 8 Maths MCQs on Negative Exponents and Expressing Numbers in Standard Form

Class 8 Maths MCQs on Negative Exponents and Standard Form

Class 8 Maths MCQs on Negative Exponents and Expressing Numbers in Standard Form

Class: 8
Subject: Mathematics
Chapter 2: Power Play
Topic: Negative Exponents & Scientific Notation
Board: CBSE (Based on Latest NCERT Curriculum)

These Multiple Choice Questions (MCQs) are strictly designed as per the CBSE curriculum based on NCERT books and are ideal for Class 8 Mathematics examination standard.

1. Simplify: 2⁻³

A) -8
B) 8
C) 1/8
D) 1/6

Answer: C) 1/8
2⁻³ = 1 / 2³ = 1 / 8.

2. Simplify: 5⁻²

A) 25
B) -25
C) 1/25
D) 1/10

Answer: C) 1/25
5⁻² = 1 / 5² = 1/25.

3. 10⁻³ equals:

A) 0.001
B) 0.01
C) 1000
D) 0.1

Answer: A) 0.001
10⁻³ = 1/1000 = 0.001.

4. Express 0.00045 in standard form:

A) 4.5 × 10⁻⁴
B) 4.5 × 10⁻³
C) 45 × 10⁻⁵
D) 0.45 × 10⁻³

Answer: A) 4.5 × 10⁻⁴
Move decimal 4 places right → exponent -4.

5. Express 3,200,000 in standard form:

A) 3.2 × 10⁵
B) 3.2 × 10⁶
C) 32 × 10⁵
D) 0.32 × 10⁷

Answer: B) 3.2 × 10⁶
Move decimal 6 places left → exponent 6.

6. Simplify: 3⁻¹

A) -3
B) 1/3
C) 3
D) 0

Answer: B) 1/3
3⁻¹ = 1/3.

7. Simplify: (2⁻² × 2³)

A) 2¹
B) 2⁵
C) 2⁻⁵
D) 2⁻¹

Answer: A) 2¹
Add exponents: -2 + 3 = 1.

8. 0.0009 in standard form:

A) 9 × 10⁻⁴
B) 9 × 10⁻³
C) 0.9 × 10⁻³
D) 9 × 10⁻⁵

Answer: A) 9 × 10⁻⁴
Move decimal 4 places right.

9. 7.5 × 10³ equals:

A) 750
B) 7500
C) 75
D) 75000

Answer: B) 7500
Move decimal 3 places right.

10. 4.2 × 10⁻² equals:

A) 0.042
B) 0.0042
C) 4.2
D) 42

Answer: A) 0.042
Move decimal 2 places left.

11. Simplify: (5⁻¹)²

A) 5⁻²
B) 25
C) 1/5
D) 1/10

Answer: A) 5⁻²
Multiply exponents: (-1)×2=-2.

12. 6.4 × 10⁴ equals:

A) 6400
B) 64000
C) 640
D) 640000

Answer: B) 64000
Move decimal 4 places right.

13. 8 × 10⁻¹ equals:

A) 0.8
B) 8
C) 80
D) 0.08

Answer: A) 0.8
Move decimal 1 place left.

14. Simplify: 10⁰

A) 0
B) 1
C) 10
D) Undefined

Answer: B) 1
Any non-zero number raised to power 0 equals 1.

15. 0.007 in standard form:

A) 7 × 10⁻³
B) 7 × 10⁻²
C) 0.7 × 10⁻²
D) 7 × 10⁻⁴

Answer: A) 7 × 10⁻³
Move decimal 3 places right.

16. Simplify: 4⁻¹

A) -4
B) 1/4
C) 4
D) 1/16

Answer: B) 1/4
4⁻¹ = 1/4.

17. 2.5 × 10⁻³ equals:

A) 0.0025
B) 0.025
C) 0.25
D) 2.5

Answer: A) 0.0025
Move decimal 3 places left.

18. Simplify: (3⁻² ÷ 3⁻⁴)

A) 3²
B) 3⁻²
C) 3⁻⁶
D) 3⁶

Answer: A) 3²
-2 - (-4) = 2.

19. 9 × 10⁵ equals:

A) 90000
B) 900000
C) 9000
D) 9000000

Answer: B) 900000
Move decimal 5 places right.

20. Which is correctly written in standard form?

A) 45 × 10³
B) 4.5 × 10³
C) 0.45 × 10⁴
D) 450 × 10²

Answer: B) 4.5 × 10³
In standard form, number must be between 1 and 10.

Class 8 Maths MCQs on Negative Exponents and Expressing Numbers in Standard Form

Class 8 Maths MCQs on Negative Exponents and Expressing Numbers in Standard Form

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