The splitting of white light into its constituent colors by a prism is due to MCQ with Answer and Explanation

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The splitting of white light into its constituent colors by a prism is due to

A. Total internal reflection

B. Reflection

C. Dispersion

D. Scattering

Answer: Option C

Solution (By JKSSB Mock Tests)

Dispersion: different wavelengths refract at different angles because refractive index varies with wavelength.

This question belongs to: Science Physics

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Question #1

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Two 100 W, 200 V bulbs are connected in series across 200 V supply. Total power consumed is

A. 200 W

B. 25 W

C. 50 W

D. 100 W

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Correct Answer: Option C

Explanation:
Each bulb resistance R = V²/P = 40000/100 = 400 Ω. In series, total R = 800 Ω. Total power P_total = V²/(total R) = 200²/800 = 40000/800 = 50 W. So each bulb gets 25 W. Series reduces power.

This question belongs to: Science Physics

Question #2

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Solar cell converts:

A. Mechanical to electricity

B. Heat to electricity

C. Light to electricity

D. Chemical to electricity

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Correct Answer: Option C

Explanation:
Photovoltaic effect: photons excite electrons in semiconductor, creating voltage. Direct light-to-electricity conversion. Memory tip: 'Photo = light; voltaic = electricity'. Renewable energy principle frequently tested in competitive exams to assess energy conversion understanding.

This question belongs to: Science Physics