The SI unit of frequency is MCQ with Answer and Explanation

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The SI unit of frequency is

A. Second

B. Hertz

C. Metre

D. Watt

Answer: Option B

Solution (By JKSSB Mock Tests)

Hertz (Hz) = cycle per second = s⁻¹. Named after Heinrich Hertz. For sound, radio waves. Kilohertz, megahertz, gigahertz.

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Question #1

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The frequency of AC mains in India is 50 Hz. The time period is

A. 0.02 s

B. 50 s

C. 0.5 s

D. 0.2 s

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Correct Answer: Option A

Explanation:
T = 1/f = 1/50 = 0.02 s.

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Question #2

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A 10 kg object is lifted to 5 m and then allowed to fall. Kinetic energy just before hitting ground (g=10) is

A. 1000 J

B. 0 J

C. 250 J

D. 500 J

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Correct Answer: Option D

Explanation:
PE at top = mgh = 10×10×5 = 500 J, converted to KE = 500 J (assuming no air resistance).

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Question #3

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The time period of a satellite in low Earth orbit is about

A. 12 hours

B. 365 days

C. 24 hours

D. 90 minutes

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Correct Answer: Option D

Explanation:
Low Earth orbit (LEO) satellites (altitude ~200-2000 km) have orbital period ~90 minutes. ISS orbits in ~93 min. Geostationary orbit period 24 h. Moon 27 days. Kepler's third law applies.

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