In uniform circular motion, which of the following is constant? MCQ with Answer and Explanation

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In uniform circular motion, which of the following is constant?

A. Kinetic energy

B. Velocity

C. Linear momentum

D. Centripetal acceleration

Answer: Option A

Solution (By JKSSB Mock Tests)

Speed constant, so kinetic energy (½mv²) constant. Velocity, acceleration, momentum change direction.

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Question #1

The density of a substance is 8 g/cm³. In SI, it is

A. 8000 kg/m³

B. 80 kg/m³

C. 800 kg/m³

D. 8 kg/m³

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Correct Answer: Option A

Explanation:
1 g/cm³ = 1000 kg/m³, so 8 g/cm³ = 8000 kg/m³.

This question belongs to: Science Physics

Question #2

The specific heat capacity of water is exceptionally high. This property is primarily responsible for:

A. Water having high surface tension.

B. The formation of sea breezes and land breezes.

C. Water being a good conductor of electricity.

D. Water expanding upon freezing.

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Correct Answer: Option B

Explanation:
Water has a specific heat capacity of 4184 J/kg·K, which is very high. This means it heats up and cools down much more slowly than land. During the day, land heats faster than the sea, causing air above it to rise and cool air from the sea to rush in (sea breeze). The reverse happens at night (land breeze).

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Question #3

The process of evaporation causes

A. No temperature change

B. Cooling

C. Boiling

D. Heating

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Correct Answer: Option B

Explanation:
Evaporation absorbs latent heat from surroundings, cooling effect.

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