Which of the following is not a source of renewable energy? MCQ with Answer and Explanation

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Which of the following is not a source of renewable energy?

A. Wind

B. Sun

C. Tides

D. Natural gas

Answer: Option D

Solution (By JKSSB Mock Tests)

Natural gas is fossil fuel, non-renewable.

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Question #1

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A bus travels the first 20 km at 40 km/h and the next 20 km at 60 km/h. Average speed is

A. 45 km/h

B. 50 km/h

C. 52 km/h

D. 48 km/h

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Correct Answer: Option D

Explanation:
Time1 = 20/40=0.5 h, Time2=20/60=1/3 h. Total time=5/6 h. Total distance=40 km. Avg speed=40/(5/6)=48 km/h. Not arithmetic mean.

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Question #2

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In a nuclear reactor, the function of a moderator is to

A. Remove heat

B. Control chain reaction

C. Absorb neutrons

D. Slow down neutrons

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Correct Answer: Option D

Explanation:
Moderator slows fast neutrons to thermal energies to increase probability of fission. Common moderators: heavy water, graphite. Control rods (cadmium, boron) absorb neutrons. Coolant removes heat.

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Question #3

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

A. Reflection

B. Dispersion

C. Scattering

D. Total internal reflection

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Correct Answer: Option B

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

This question belongs to: Science Physics

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