The process of heat transfer without any medium is MCQ with Answer and Explanation

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The process of heat transfer without any medium is

A. Evaporation

B. Radiation

C. Conduction

D. Convection

Answer: Option B

Solution (By JKSSB Mock Tests)

Radiation by electromagnetic waves can travel through vacuum.

This question belongs to: Science Physics

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Question #1

The device used to increase or decrease AC voltage is

A. Motor

B. Transformer

C. Rectifier

D. Generator

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Correct Answer: Option B

Explanation:
Transformer changes AC voltage.

This question belongs to: Science Physics

Question #2

The area under a velocity-time graph represents which of the following physical quantities?

A. Displacement

B. Acceleration

C. Momentum

D. Force

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Correct Answer: Option A

Explanation:
The area under the curve of a velocity-time graph represents the total displacement covered by an object in a given time interval. Since velocity = displacement/time, the product of velocity and time (the area) yields displacement. The slope of a velocity-time graph, conversely, represents acceleration.

This question belongs to: Science Physics

Question #3

The instrument to measure pressure difference is

A. Barometer

B. Manometer

C. Hydrometer

D. Aneroid barometer

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Correct Answer: Option B

Explanation:
Manometer measures pressure difference, often U-tube. Barometer measures atmospheric pressure.

This question belongs to: Science Physics

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