The frequency of a source of sound is 500 Hz. The number of vibrations it makes in 2 minutes is MCQ with Answer and Explanation

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The frequency of a source of sound is 500 Hz. The number of vibrations it makes in 2 minutes is

A. 60000

B. 500

C. 1000

D. 30000

Answer: Option A

Solution (By JKSSB Mock Tests)

Frequency = vibrations per second. 500 vibrations per second. In 2 min = 120 s, total vibrations = 500 × 120 = 60,000. Simple multiplication.

This question belongs to: Science Physics

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The principle of working of a hydrogen bomb is

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B. Chain reaction

C. Nuclear fusion

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Correct Answer: Option C

Explanation:
Hydrogen bomb uses uncontrolled fusion of deuterium and tritium triggered by fission bomb. Releases vast energy, thermonuclear reaction. Sun's energy is fusion.

This question belongs to: Science Physics

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The relative permeability of a ferromagnetic material is

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Correct Answer: Option C

Explanation:
Ferromagnetic materials have μ_r >> 1 (hundreds to thousands). Paramagnetic slightly >1, diamagnetic

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Question #3

If the percentage error in measurement of radius of a sphere is 2%, the percentage error in volume is

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Correct Answer: Option A

Explanation:
Volume V = (4/3)πr³, so ΔV/V = 3 Δr/r. Percentage error in volume = 3 × 2% = 6%.

This question belongs to: Science Physics

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