1 kWh of energy equals MCQ with Answer and Explanation

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1 kWh of energy equals

A. 3.6 × 10⁶ J

B. 3.6 × 10³ J

C. 3.6 J

D. 3.6 × 10⁸ J

Answer: Option A

Solution (By JKSSB Mock Tests)

1 kWh = 1000 W × 3600 s = 3.6 × 10⁶ J. Important conversion.

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Which of the following is an application of electromagnetic induction?

A. Electric fuse

B. Electric bell

C. Dynamo

D. Moving coil galvanometer

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Correct Answer: Option C

Explanation:
Dynamo/generator converts mechanical to electrical energy using induction.

This question belongs to: Science Physics

Question #2

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A rocket works on the principle of conservation of

A. Mass

B. Momentum

C. Energy

D. Angular momentum

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Correct Answer: Option B

Explanation:
Rocket propulsion: expelled gases backwards impart forward momentum to rocket. Total momentum of rocket + exhaust gases remains conserved. No external force, so momentum conservation applies. Jet engines also work on similar principle.

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Question #3

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Sound resonance used in:

A. Musical instruments

B. Both

C. Neither

D. Tuning forks

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Correct Answer: Option B

Explanation:
Resonance amplifies sound at natural frequency: instruments (guitar body), tuning forks (frequency standard). Memory tip: 'Resonance: musical instruments (amplify), tuning forks (calibration), avoid in bridges'. Wave application frequently tested in competitive exams.

This question belongs to: Science Physics

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