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

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The device that converts light energy into electrical energy is

A. Solar cell

B. Laser

C. Photodiode

D. LED

Answer: Option A

Solution (By JKSSB Mock Tests)

Solar cell (photovoltaic cell) generates electricity from light.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1

A 10 kg object is falling freely under gravity. The net force acting on it is (g=10)

A. 10 N

B. 1 N

C. 100 N

D. 0 N

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Correct Answer: Option C

Explanation:
Weight = mg = 10×10 = 100 N. In free fall, only force is gravity (air resistance neglected). Net force = weight, so F = 100 N, causing acceleration g.

This question belongs to: Science Physics

Question #2

Superconductivity characterized by:

A. Zero resistance below T_c

B. Infinite resistance

C. High conductivity only

D. Zero permeability

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Correct Answer: Option A

Explanation:
Superconductors: zero electrical resistance below critical temperature T_c, plus Meissner effect (expel magnetic fields). Memory aid: 'Superconductor: R=0 below T_c; perfect diamagnetism'. Modern physics concept frequently tested in competitive exams.

This question belongs to: Science Physics

Question #3

The half-life of a radioactive sample is 3 days. After 9 days, fraction remaining is

A. 1/4

B. 1/2

C. 1/16

D. 1/8

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Correct Answer: Option D

Explanation:
3 half-lives (9/3=3) => (1/2)³ = 1/8.

This question belongs to: Science Physics

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