The frequency of AC mains in India is 50 Hz. The time period is MCQ with Answer and Explanation

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The frequency of AC mains in India is 50 Hz. The time period is

A. 0.5 s

B. 50 s

C. 0.2 s

D. 0.02 s

Answer: Option D

Solution (By JKSSB Mock Tests)

T = 1/f = 1/50 = 0.02 s.

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Question #1

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A 5 Ω resistor dissipates 20 W power. Current through it is

A. 100 A

B. 2 A

C. 4 A

D. 0.5 A

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Correct Answer: Option B

Explanation:
P = I² R => I = √(P/R) = √(20/5) = √4 = 2 A.

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Question #2

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A current of 0.5 A flows through a 100 Ω resistor. Voltage across it is

A. 200 V

B. 0.005 V

C. 5 V

D. 50 V

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Correct Answer: Option D

Explanation:
V = IR = 0.5×100 = 50 V.

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Question #3

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Which of the following waves is longitudinal?

A. Waves on a string

B. Radio waves

C. Sound waves in air

D. Light waves

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Correct Answer: Option C

Explanation:
Sound waves in air are longitudinal, particles vibrate parallel to wave propagation. Light and radio are electromagnetic, transverse. Waves on a string are transverse. In fluids, only longitudinal mechanical waves can propagate.

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