The phenomenon of increase in frequency when source of sound approaches observer is called MCQ with Answer and Explanation

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The phenomenon of increase in frequency when source of sound approaches observer is called

A. Doppler effect

B. Resonance

C. Reverberation

D. Echo

Answer: Option A

Solution (By JKSSB Mock Tests)

Doppler effect: apparent frequency change due to relative motion. Approaching increases frequency.

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A man pushes a wall but fails to move it. Work done is

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B. Negative

C. Zero

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Correct Answer: Option C

Explanation:
Displacement zero, so work zero.

This question belongs to: Science Physics

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Polarization used in:

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C. Both

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Correct Answer: Option C

Explanation:
Polarized sunglasses block reflected glare (horizontal polarization). LCDs use liquid crystals to rotate polarization for pixel control. Memory tip: 'Polarization: sunglasses (glare reduction), LCDs (display technology)'. Optics application frequently tested in competitive exams.

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In uniform circular motion, which of the following is constant?

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Correct Answer: Option D

Explanation:
Speed constant, so kinetic energy (½mv²) constant. Velocity, acceleration, momentum change direction.

This question belongs to: Science Physics

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