Beats used for: MCQ with Answer and Explanation

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Beats used for:

A. Sound speed measurement

B. Instrument tuning

C. Neither

D. Both

Answer: Option D

Solution (By JKSSB Mock Tests)

Beats: tune instruments (zero beat = matched frequency); measure sound speed via known frequency difference. Memory tip: 'Beats: tuning and measurement applications'. Wave phenomenon application frequently tested in competitive exams.

This question belongs to: Science Physics

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Question #1

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The colour of an object is due to

A. Reflection of that colour

B. Transmission of that colour

C. Emission of that colour

D. Absorption of all colours

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Correct Answer: Option A

Explanation:
Object reflects that colour and absorbs others.

This question belongs to: Science Physics

Question #2

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A 10 μF capacitor is charged to 100 V. Energy stored is

A. 50 J

B. 0.5 J

C. 0.05 J

D. 5 J

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Correct Answer: Option C

Explanation:
E = ½CV² = ½ × 10×10⁻⁶ × 10000 = 0.05 J.

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Question #3

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

A. ½kx²

B. kx²

C. kx

D. ½kx

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Correct Answer: Option A

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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