Power Play — Important Questions
CBSE · Class 8 · Mathematics
66 important questions from Power Play for CBSE Class 8 Mathematics, with answers. Includes multiple choice and true false questions.
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Important Questions from Power Play
A 5-digit password lock has 10 options for each digit slot. How many combinations are possible, and what exponential form represents this?
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1,00,000; 10^5
Each of the 5 digit slots has 10 choices, so total combinations are 10 × 10 × 10 × 10 × 10 = 10^5 = 1,00,000.
A 3-digit lock and a 2-digit lock are compared. What is the difference in the number of combinations between them?
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900
A 3-digit lock has 1000 combinations and a 2-digit lock has 100 combinations. The difference is 1000 - 100 = 900.
A line of length 2^4 units is halved 10 times. What is the final length in simplest form?
Show answer
1/64 unit
The length becomes 2^4 ÷ 2^10 = 2^(4-10) = 2^-6 = 1/2^6 = 1/64 unit.
A paper thickness starts at 0.001 cm. After 3 folds, what is the thickness, and what factor increase does that represent?
Show answer
0.008 cm and 8 times
After 3 folds, thickness = 0.001 × 2^3 = 0.008 cm. Since 2^3 = 8, the thickness becomes 8 times.
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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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