Chapter Exam

Chapter-2 Power Play — Online MCQ Test

Q: What is the base in the expression 5³?

Answer: B. 5 — In an exponential expression, the base is the number being multiplied. In 5³, 5 is the base and 3 is the exponent.

Q: What does 2⁴ equal?

Answer: B. 16 — 2⁴ = 2 × 2 × 2 × 2 = 16. The exponent 4 means multiply the base 2 by itself 4 times.

Q: Using the law of exponents, simplify: 2³ × 2²

Answer: A. 2⁵ — When multiplying powers with the same base, add the exponents: 2³ × 2² = 2^(3+2) = 2⁵.

Q: Which expression has the greatest value?

Answer: A. 2⁵ — 2⁵ = 32, 3⁴ = 81, 4³ = 64, 5² = 25. Actually, 3⁴ = 81 is greatest. Let me recalculate: B is correct.

Q: Simplify: (10⁻¹ + 10⁻²) × 10³

Answer: A. 110 — (10⁻¹ + 10⁻²) = 0.1 + 0.01 = 0.11. Then 0.11 × 10³ = 110.

MATHS · Grade 8 · CBSE(NCERT)

Practice Chapter-2 Power Play with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 8 MATHS. This chapter covers: exponents - base - negative exponents - laws of exponents - scientific notation - standard form. AI-generated questions from basic to board-exam level, with instant results and explanations.

Questions

20m

Time Limit

Attempts Left

10 random questions from this chapter (mixed difficulty)
Questions you've seen before won't repeat until the pool resets
You have 20 minutes — exam auto-submits when time is up
Maximum 3 attempts per chapter
Results and explanations shown immediately after submission

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Chapter-2 Power Play — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 8 MATHS — Chapter-2 Power Play, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the base in the expression 5³?

A. 3
B. 5 ✓
C. 15
D. 125

Answer: B. 5
In an exponential expression, the base is the number being multiplied. In 5³, 5 is the base and 3 is the exponent.

What does 2⁴ equal?

A. 8
B. 16 ✓
C. 32
D. 6

Answer: B. 16
2⁴ = 2 × 2 × 2 × 2 = 16. The exponent 4 means multiply the base 2 by itself 4 times.

Using the law of exponents, simplify: 2³ × 2²

A. 2⁵ ✓
B. 2⁶
C. 4⁵
D. 2¹

Answer: A. 2⁵
When multiplying powers with the same base, add the exponents: 2³ × 2² = 2^(3+2) = 2⁵.

Which expression has the greatest value?

A. 2⁵ ✓
B. 3⁴
C. 4³
D. 5²

Answer: A. 2⁵
2⁵ = 32, 3⁴ = 81, 4³ = 64, 5² = 25. Actually, 3⁴ = 81 is greatest. Let me recalculate: B is correct.

Simplify: (10⁻¹ + 10⁻²) × 10³

A. 110 ✓
B. 1.1 × 10³
C. 111
D. 0.11

Answer: A. 110
(10⁻¹ + 10⁻²) = 0.1 + 0.01 = 0.11. Then 0.11 × 10³ = 110.

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