The speed of light in vacuum is approximately MCQ with Answer and Explanation

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The speed of light in vacuum is approximately

A. 3 × 10⁸ m/s

B. 3 × 10⁶ km/s

C. 3 × 10⁵ m/s

D. 3 × 10⁴ m/s

Answer: Option A

Solution (By JKSSB Mock Tests)

3×10⁸ m/s = 3×10⁵ km/s.

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Question #1

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Atmospheric pressure at sea level is about

A. 10³ Pa

B. 10⁹ Pa

C. 10⁷ Pa

D. 10⁵ Pa

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Correct Answer: Option D

Explanation:
1 atm = 1.013×10⁵ Pa. Standard approximation.

This question belongs to: Science Physics

Question #2

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The device used for detecting feeble electric current is

A. Voltmeter

B. Ammeter

C. Galvanometer

D. Wattmeter

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Correct Answer: Option C

Explanation:
Galvanometer detects small currents and direction. Ammeter measures larger currents.

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Question #3

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Pendulum period independent of:

A. Gravity

B. Small amplitude

C. Bob mass

D. Length

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Correct Answer: Option C

Explanation:
T = 2π√(l/g): depends on l and g, independent of mass (gravitational and inertial mass cancel). Memory aid: 'Pendulum: T ∝ √(l/g); independent of mass for small angles'. Oscillations concept frequently tested in competitive exams.

This question belongs to: Science Physics

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