Microwave oven heats food by MCQ with Answer and Explanation

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Microwave oven heats food by

A. Infrared radiation

B. Agitating water molecules

C. Convection

D. Conduction

Answer: Option B

Solution (By JKSSB Mock Tests)

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

This question belongs to: Science Physics

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Question #1

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Which of the following colours of light has minimum wavelength?

A. Green

B. Blue

C. Red

D. Violet

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Correct Answer: Option D

Explanation:
Violet ~400 nm, shortest in visible. Red ~700 nm, longest. Order VIBGYOR. Shorter wavelength higher frequency, more energy. Ultraviolet beyond violet.

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Question #2

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The working of a rocket is based on

A. Conservation of energy

B. Law of gravitation

C. Newton's first law

D. Conservation of linear momentum

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Correct Answer: Option D

Explanation:
Rocket propulsion: momentum of exhaust gases equals momentum gained by rocket.

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Question #3

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An object is placed at 2F of a convex lens. Image formed is

A. Real, inverted, same size

B. Virtual, erect, magnified

C. Virtual, inverted, same size

D. Real, inverted, diminished

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Correct Answer: Option A

Explanation:
At 2F, image also at 2F, real inverted same size. Used in photocopiers.

This question belongs to: Science Physics

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