A 100 W bulb is used for 10 hours. Energy consumed is MCQ with Answer and Explanation

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A 100 W bulb is used for 10 hours. Energy consumed is

A. 100 kWh

B. 0.1 kWh

C. 1 kWh

D. 10 kWh

Answer: Option C

Solution (By JKSSB Mock Tests)

Energy = 0.1 kW × 10 h = 1 kWh.

This question belongs to: Science Physics

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Question #1

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A pulley system has 4 pulleys. Its velocity ratio (number of supporting ropes) is

A. 4

B. 2

C. 8

D. 1

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Correct Answer: Option A

Explanation:
For ideal block and tackle with n movable pulleys, VR = n = 4.

This question belongs to: Science Physics

Question #2

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The process of splitting a heavy nucleus into lighter nuclei is

A. Fission

B. Transmutation

C. Fusion

D. Radioactive decay

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Correct Answer: Option A

Explanation:
Fission, e.g., U-235 splitting.

This question belongs to: Science Physics

Question #3

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The unit of latent heat is

A. W

B. J

C. J/°C

D. J/kg

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Correct Answer: Option D

Explanation:
Latent heat per unit mass, so Q = mL, L = Q/m, unit J/kg (or cal/g). Specific latent heat of fusion/vaporization. Heat required for phase change without temperature change.

This question belongs to: Science Physics

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