Medium n=2. Light speed in medium: MCQ with Answer and Explanation

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Medium n=2. Light speed in medium:

A. 0.5×10⁸ m/s

B. 1.5×10⁸ m/s

C. 6×10⁸ m/s

D. 3×10⁸ m/s

Answer: Option B

Solution (By JKSSB Mock Tests)

v = c/n = 3×10⁸/2 = 1.5×10⁸ m/s. Direct refractive index application. Memory tip: 'Higher n ⇒ slower light; v = c/n'. Optics calculation frequently tested in competitive exams.

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Question #1

An echo is heard from a cliff after 3 s. If speed of sound is 340 m/s, distance of cliff is

A. 1020 m

B. 170 m

C. 340 m

D. 510 m

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Correct Answer: Option D

Explanation:
d = v × t / 2 = 340 × 3 / 2 = 510 m.

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Question #2

An electric iron draws 5 A at 220 V. Its power is

A. 2200 W

B. 1100 W

C. 44 W

D. 550 W

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Correct Answer: Option B

Explanation:
P = V×I = 220 × 5 = 1100 W = 1.1 kW. Energy consumed in 2 hours = 2.2 kWh. Simple.

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Question #3

Beats observable when frequencies are:

A. Very different

B. Slightly different

C. Identical

D. Any values

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Correct Answer: Option B

Explanation:
Beats: interference of close frequencies (Δf small, typically

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