The unit of electric power is MCQ with Answer and Explanation

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The unit of electric power is

A. Ohm

B. Ampere

C. Joule

D. Watt

Answer: Option D

Solution (By JKSSB Mock Tests)

Watt (W) = J/s = V×A. Commercial unit kilowatt-hour (energy). Joule is energy. Ohm resistance. Ampere current.

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Question #1

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The pressure at the bottom of a tank of water of depth 10 m (ρ=1000, g=10) is

A. 100000 Pa

B. 1000 Pa

C. 100 Pa

D. 10 Pa

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Correct Answer: Option A

Explanation:
P = ρgh = 1000×10×10 = 100,000 Pa = 100 kPa.

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Question #2

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The device used for detecting and measuring small electric current is

A. Wattmeter

B. Voltmeter

C. Ammeter

D. Galvanometer

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Correct Answer: Option D

Explanation:
Galvanometer is sensitive instrument for detecting presence and direction of small currents. Ammeter measures larger currents. Voltmeter potential difference. Wattmeter power.

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Question #3

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Uniform acceleration: v-t graph is:

A. Horizontal line

B. Hyperbola

C. Straight line with slope

D. Parabola

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Correct Answer: Option C

Explanation:
a = constant ⇒ v = u + at (linear in t). Slope = acceleration. Memory tip: 'v-t slope = acceleration; area = displacement'. Graph interpretation frequently tested in competitive kinematics sections.

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