The unit of power, watt, is equivalent to MCQ with Answer and Explanation

Question Report Error

The unit of power, watt, is equivalent to

A. J/s

B. J s

C. N/s

D. N m

Answer: Option A

Solution (By JKExamLibrary)

Watt = joule per second.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

Which of the following is an SI derived unit named after a scientist?

A. Kilogram

B. Pascal

C. Second

D. Metre

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Correct Answer: Option B

Explanation:
Pascal (Pa) named after Blaise Pascal, derived unit for pressure (N/m²). Metre, kilogram, second are base units. Joule, watt, newton, hertz, coulomb also named scientists.

This question belongs to: Science Physics

Question #2 Report Error

Why does a metal spoon feel colder than a wooden spoon when left in a cold room, despite both being at the same room temperature?

A. The specific heat of metal is higher than that of wood.

B. Metal absorbs coldness from the air faster.

C. Metal is a poorer conductor of heat than wood.

D. Metal is a better conductor of heat than wood.

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Correct Answer: Option D

Explanation:
Both spoons are at the same temperature. However, metal is a good conductor of heat. When you touch it, it rapidly conducts heat away from your hand, making your skin feel a sudden drop in temperature (which you perceive as 'cold'). Wood is a poor conductor, so it draws heat from your hand very slowly.

This question belongs to: Science Physics