The SI unit of frequency is MCQ with Answer and Explanation

The SI unit of frequency is

A. Watt

B. Second

C. Metre

D. Hertz

Answer: Option D

Solution (By JKExamLibrary)

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

This question belongs to: Science Physics

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Question #1 Report Error

Which of the following is true for a geostationary satellite?

A. It appears fixed relative to a point on Earth

B. Its orbital period is 12 hours

C. It revolves opposite to Earth's rotation

D. Its orbit is at any altitude

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Correct Answer: Option A

Explanation:
Geostationary satellite has orbital period equal to Earth's rotation (24 hours) and orbits in equatorial plane in same direction. It appears stationary from Earth's surface. Altitude about 36,000 km. Used for communication.

This question belongs to: Science Physics

Question #2 Report Error

Microwave oven heats food by

A. Convection

B. Infrared radiation

C. Agitating water molecules

D. Conduction

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Correct Answer: Option C

Explanation:
Microwaves cause polar water molecules to rotate, generating heat through molecular friction (dielectric heating).

This question belongs to: Science Physics

Question #3 Report Error

A convex mirror is used as a rear-view mirror because it

A. Inverts image

B. Gives wider field of view

C. Gives real image

D. Magnifies image

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Correct Answer: Option B

Explanation:
Convex mirror diverges rays, gives erect, diminished, virtual image with wider field. Concave would magnify but narrow field. Plane gives normal view. Safety advantage.

This question belongs to: Science Physics

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