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Light (Optics) - Refraction MCQs

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Light (Optics) - Refraction

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CSS - PMS - CCE - PCS - General Science Light (Optics) - Refraction
The speed of light in vacuum is approximately:
A. 3 x 10^8 m/s
B. 3 x 10^6 m/s
C. 300 m/s
D. 30,000 m/s
Read Theory
Correct Answer: A
A: Correct because light travels at about 3 x 10^8 metres per second in vacuum. B: Wrong because this is 100 times smaller than the accepted value. C: Wrong because 300 m/s is near the speed of sound, not light. D: Wrong because 30,000 m/s is too low for light.
CSS - PMS - CCE - PCS - General Science Light (Optics) - Refraction
The approximate speed of light in vacuum is:
A. 3 × 10⁸ m/s
B. 3 × 10⁶ m/s
C. 300 m/s
D. 30 km/h
Read Theory
Correct Answer: A
A: Correct because light travels at about 3 × 10⁸ metres per second in vacuum. B: Wrong because it is 100 times smaller than the accepted value. C: Wrong because this is closer to speed of sound scale, not light. D: Wrong because 30 km/h is ordinary vehicle speed.
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