The device that converts light energy into electrical energy is MCQ with Answer and Explanation

Question Report Error

The device that converts light energy into electrical energy is

A. Laser

B. Photodiode

C. LED

D. Solar cell

Answer: Option D

Solution (By JKExamLibrary)

Solar cell (photovoltaic cell) generates electricity from light.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

A proton and an electron enter a uniform magnetic field with same velocity perpendicular to field. Which has larger radius?

A. Same

B. Electron

C. Depends on charge

D. Proton

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Correct Answer: Option D

Explanation:
r = mv/(qB). Proton mass >> electron mass, so radius larger.

This question belongs to: Science Physics

Question #2 Report Error

The scientist who gave the plum pudding model of atom was

A. Dalton

B. Bohr

C. Rutherford

D. J.J. Thomson

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Correct Answer: Option D

Explanation:
J.J. Thomson proposed plum-pudding: positive sphere with embedded electrons. Rutherford disproved by gold foil experiment, proposed nuclear model. Bohr added energy levels. Dalton solid sphere.

This question belongs to: Science Physics

Question #3 Report Error

Two balls of masses m and 2m are dropped from a height h. Neglecting air resistance, which hits the ground with greater momentum?

A. Both same

B. Depends on height

C. m

D. 2m

View Answer & Solution Discuss

Correct Answer: Option D

Explanation:
Both reach same velocity v = √(2gh). Momentum = mass × v, so larger mass has greater momentum. KE different, but momentum differs.

This question belongs to: Science Physics

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