A solar cell converts MCQ with Answer and Explanation

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A solar cell converts

A. Mechanical energy to electrical energy

B. Heat energy to electrical energy

C. Chemical energy to electrical energy

D. Light energy to electrical energy

Answer: Option D

Solution (By JKSSB Mock Tests)

Solar cell (photovoltaic cell) converts sunlight directly into electricity using semiconductor p-n junction. No heat involved. Battery converts chemical to electrical. Thermocouple heat to electrical. Solar energy is renewable.

This question belongs to: Science Physics

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Question #1

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A gap is left between railway tracks to allow for

A. Contraction in summer

B. Vibration

C. Expansion in summer

D. Weight of train

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Correct Answer: Option C

Explanation:
Thermal expansion. Rails expand in summer heat, gap prevents buckling. Linear expansion ΔL = α L ΔT.

This question belongs to: Science Physics

Question #2

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If the momentum of a body is doubled, its kinetic energy becomes

A. Four times

B. Half

C. Double

D. Same

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Correct Answer: Option A

Explanation:
K = p²/(2m), if p'=2p, K'=4p²/(2m)=4K. Quadratic relation.

This question belongs to: Science Physics

Question #3

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A convex lens forms a real and inverted image of same size when object is at

A. Between F and 2F

B. F

C. 2F

D. Infinity

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Correct Answer: Option C

Explanation:
At 2F, image at 2F, same size, real inverted.

This question belongs to: Science Physics

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