Power Play
CBSE · Class 8 · Mathematics
Practice quiz for Power Play — CBSE Class 8 Mathematics. MCQs and questions with answers to test your preparation.
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Quick Quiz: Power Play
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Calculate the value of 2^5.
Simplify: 3^4 × 3^2
What is the value of 4^0?
Express 64 as a power of 2.
Sample Questions
Which of the following are equal to 8^3? (Select all correct answers)
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512, 2^9, 64 × 8, (2^3)^3
8^3 = 8 × 8 × 8 = 512. Also, 8 = 2^3, so 8^3 = (2^3)^3 = 2^9. And 8^3 = 8^2 × 8 = 64 × 8. The value 24 is incorrect (that would be 8 × 3).
Simplify: 5^7 ÷ 5^3
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5^4
Using the rule a^m ÷ a^n = a^(m-n): 5^7 ÷ 5^3 = 5^(7-3) = 5^4. When dividing powers with the same base, subtract the exponents. Common mistake: adding exponents instead of subtracting.
What is 2^(-3)?
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1/8
2^(-3) = 1/2^3 = 1/8. Negative exponent rule: a^(-n) = 1/a^n. So 2^(-3) = 1/2^3 = 1/8. Common mistake: making the answer negative.
Express 0.000025 in scientific notation.
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2.5 × 10^(-5)
0.000025 = 2.5 × 10^(-5). Move decimal point 5 places right to get 2.5, so exponent is -5. Scientific notation: coefficient between 1-10 multiplied by power of 10.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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