The sky appears blue due to MCQ with Answer and Explanation

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The sky appears blue due to

A. Total internal reflection

B. Dispersion

C. Refraction

D. Scattering

Answer: Option D

Solution (By JKSSB Mock Tests)

Rayleigh scattering by air molecules, shorter wavelengths (blue) scattered more.

This question belongs to: Science Physics

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Question #1

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A convex lens is placed in water. Its focal length

A. Remains same

B. Becomes zero

C. Decreases

D. Increases

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Correct Answer: Option D

Explanation:
Refractive index relative to water decreases, so power decreases, focal length increases.

This question belongs to: Science Physics

Question #2

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The maximum displacement of a particle from mean position in SHM is called

A. Time period

B. Wavelength

C. Frequency

D. Amplitude

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Correct Answer: Option D

Explanation:
Amplitude is max displacement.

This question belongs to: Science Physics

Question #3

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A spring of spring constant k is stretched by x. The potential energy stored is

A. kx

B. ½kx²

C. ½kx

D. kx²

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Correct Answer: Option B

Explanation:
Elastic potential energy stored in a stretched/compressed spring is ½kx², where x is displacement from equilibrium. This is work done against spring force which is average force times displacement. Work = ½Fx = ½(kx)x = ½kx². Similar to capacitor energy ½CV².

This question belongs to: Science Physics

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