A wave completes 20 oscillations in 4 seconds. Frequency is MCQ with Answer and Explanation

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A wave completes 20 oscillations in 4 seconds. Frequency is

A. 4 Hz

B. 5 Hz

C. 0.2 Hz

D. 80 Hz

Answer: Option B

Solution (By JKSSB Mock Tests)

f = 20/4 = 5 Hz.

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Question #1

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Which of the following is a renewable source of energy?

A. Petroleum

B. Coal

C. Nuclear fuel

D. Solar energy

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Correct Answer: Option D

Explanation:
Solar, wind, hydro, biomass renewable. Coal, oil, natural gas fossil fuels, non-renewable. Nuclear fuel uranium finite. Renewable replenish naturally.

This question belongs to: Science Physics

Question #2

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Potentiometer sensitivity increased by:

A. Shorter wire

B. Higher current

C. Longer wire

D. Thicker wire

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Correct Answer: Option C

Explanation:
Longer wire ⇒ smaller potential gradient (V/cm) ⇒ finer voltage measurement ⇒ higher sensitivity. Memory tip: 'Sensitivity ∝ wire length; smaller gradient = better resolution'. Experimental physics concept frequently tested in competitive exams.

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Question #3

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Which of the following is used as a moderator in nuclear reactor?

A. Cadmium

B. Uranium

C. Graphite

D. Boron

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Correct Answer: Option C

Explanation:
Graphite, heavy water (D₂O), beryllium are moderators. Cadmium and boron are control rods (absorb neutrons). Uranium is fuel. Moderator slows neutrons.

This question belongs to: Science Physics

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