1 kWh of energy equals MCQ with Answer and Explanation

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1 kWh of energy equals

A. 3.6 J

B. 3.6 × 10³ J

C. 3.6 × 10⁸ J

D. 3.6 × 10⁶ J

Answer: Option D

Solution (By JKSSB Mock Tests)

1 kWh = 1000 W × 3600 s = 3.6 × 10⁶ J. Important conversion.

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Question #1

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The speed of sound in air at 0°C is approximately

A. 350 m/s

B. 340 m/s

C. 330 m/s

D. 300 m/s

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Correct Answer: Option C

Explanation:
At 0°C, speed ~ 331 m/s. At room temperature (20°C) ~ 343 m/s, often taken as 340. Increases with temperature v ∝ √T. For many problems 340 is used, but at 0°C it's 331. So option A.

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Question #2

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The freezing point of mercury is -39°C. It cannot be used in thermometers for temperatures below this because

A. It expands

B. It freezes

C. It becomes transparent

D. It evaporates

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Correct Answer: Option B

Explanation:
Below freezing point, mercury solidifies and doesn't work. Alcohol thermometers used for low temps.

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Question #3

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The frequency of AC mains in India is

A. 60 Hz

B. 100 Hz

C. 0 Hz

D. 50 Hz

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Correct Answer: Option D

Explanation:
Indian grid frequency 50 Hz, voltage 230 V. In USA 60 Hz. Most Asian/European countries 50 Hz. Transformers designed accordingly.

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