The unit of electric power can be expressed as MCQ with Answer and Explanation

Question Report Error

The unit of electric power can be expressed as

A. Volt × ampere

B. Coulomb × volt

C. Joule × second

D. Ohm × meter

Answer: Option A

Solution (By JKExamLibrary)

P = V I, so watt = volt × ampere.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

The process of emission of electrons from hot metal surface is called

A. Thermionic emission

B. Secondary emission

C. Photoelectric emission

D. Field emission

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Correct Answer: Option A

Explanation:
Thermionic emission: electrons emitted when metal heated to high temperature (e.g., filament in cathode ray tube). Photoelectric: light incident. Field emission: strong electric field. Secondary: bombardment by particles.

This question belongs to: Science Physics

Question #2 Report Error

The principle of a pressure cooker is

A. Decrease in pressure raises boiling point

B. No effect on boiling point

C. Increase in pressure lowers boiling point

D. Increase in pressure raises boiling point

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Correct Answer: Option D

Explanation:
Higher pressure inside, boiling point >100°C, food cooks faster.

This question belongs to: Science Physics

Question #3 Report Error

A wave has speed 300 m/s and frequency 150 Hz. Wavelength is

A. 2 m

B. 0.5 m

C. 45000 m

D. 300 m

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Correct Answer: Option A

Explanation:
λ = v/f = 300/150 = 2 m.

This question belongs to: Science Physics

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