A soap bubble appears coloured due to MCQ with Answer and Explanation

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A soap bubble appears coloured due to

A. Diffraction

B. Interference

C. Dispersion

D. Scattering

Answer: Option B

Solution (By JKSSB Mock Tests)

Thin film interference produces colours.

This question belongs to: Science Physics

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Question #1

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The colour of light that deviates least in a glass prism is

A. Red

B. Green

C. Blue

D. Violet

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Correct Answer: Option A

Explanation:
Dispersion: red has longest wavelength, lowest refractive index, deviates least. Violet deviates most. So spectrum: red at top (least deviation), violet at bottom.

This question belongs to: Science Physics

Question #2

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A photon of energy 3.3 eV has frequency approximately (h=4.14×10⁻¹⁵ eV s)

A. 1.25×10¹⁵ Hz

B. 3×10⁸ Hz

C. 8×10¹⁴ Hz

D. 5×10¹⁴ Hz

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Correct Answer: Option C

Explanation:
f = E/h = 3.3 / 4.14×10⁻¹⁵ ≈ 8×10¹⁴ Hz.

This question belongs to: Science Physics

Question #3

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The velocity of sound is maximum in

A. Steel

B. Water

C. Air

D. Vacuum

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Correct Answer: Option A

Explanation:
Speed of sound: solids > liquids > gases. In steel ~5000 m/s, water ~1500 m/s, air ~340 m/s. Vacuum no propagation. Speed depends on density and elasticity.

This question belongs to: Science Physics

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