A machine does 1000 J of work in 20 s. Power is MCQ with Answer and Explanation

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A machine does 1000 J of work in 20 s. Power is

A. 20 W

B. 5 W

C. 20000 W

D. 50 W

Answer: Option D

Solution (By JKSSB Mock Tests)

P = 1000/20 = 50 W.

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Question #1

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In elastic collision, which quantity is always conserved?

A. Both momentum and kinetic energy

B. Momentum only

C. Kinetic energy only

D. Velocity

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Correct Answer: Option A

Explanation:
Elastic collisions conserve both total momentum and total kinetic energy. Inelastic collisions conserve only momentum. This distinction is fundamental in collision analysis. Memory aid: 'Elastic = KE + momentum conserved; Inelastic = momentum only'. Frequently tested concept to differentiate collision types in competitive exam mechanics sections.

This question belongs to: Science Physics