The unit of work is MCQ with Answer and Explanation

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The unit of work is

A. Pascal

B. Joule

C. Newton

D. Watt

Answer: Option B

Solution (By JKSSB Mock Tests)

Joule = N·m. Work = force × displacement. Energy also joule. Watt = J/s. Newton force. Pascal pressure.

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Question #1

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The gravitational force between two masses is F. If the distance between them is halved, the force becomes

A. 2F

B. F/4

C. 4F

D. F/2

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Correct Answer: Option C

Explanation:
Newton's law of gravitation: F ∝ 1/r². If distance r becomes r/2, new force F' ∝ 1/(r/2)² = 4/r² = 4F. So force quadruples. This inverse square law is fundamental for gravitational, electric, magnetic forces.

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Question #2

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The process of heat transfer in a solid metal rod is

A. Sublimation

B. Radiation

C. Conduction

D. Convection

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Correct Answer: Option C

Explanation:
In solids, heat flows by conduction (lattice vibrations and free electrons). Metals are good conductors due to free electrons. Convection in fluids, radiation no medium.

This question belongs to: Science Physics