TIR used in: MCQ with Answer and Explanation

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TIR used in:

A. Optical fibers

B. Diamond brilliance

C. Neither

D. Both

Answer: Option D

Solution (By JKSSB Mock Tests)

Optical fibers: TIR confines light in core. Diamonds: high n gives small θ_c, causing multiple TIRs for sparkle. Memory aid: 'TIR applications: fibers (communication), diamonds (optics)'. Optics application frequently tested in competitive exams.

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Question #1

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The function of a fuse in a domestic circuit is to

A. Reduce current

B. Protect against short circuit and overload

C. Increase power factor

D. Regulate voltage

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Correct Answer: Option B

Explanation:
Fuse is a safety device: thin wire melts when current exceeds safe limit due to short circuit or overload, breaking circuit. Prevents fire and appliance damage. Based on heating effect. MCB is modern alternative.

This question belongs to: Science Physics

Question #2

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The unit of pressure in SI is

A. Torr

B. Pascal

C. Atmosphere

D. Bar

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Correct Answer: Option B

Explanation:
Pascal = N/m². Named after Blaise Pascal. Bar = 10⁵ Pa, atmosphere = 101325 Pa, torr = 133.3 Pa. SI unit is Pascal.

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Question #3

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A tuning fork A produces 5 beats/second with tuning fork B of frequency 256 Hz. If a little wax is applied to fork A, the beat frequency becomes 2 beats/second. The original frequency of fork A was:

A. 258 Hz

B. 261 Hz

C. 254 Hz

D. 251 Hz

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Correct Answer: Option B

Explanation:
The beat frequency is |fA - fB|. So fA is either 256+5=261 Hz or 256-5=251 Hz. Adding wax increases mass, which strictly decreases frequency. If fA was 261, decreasing it brings it closer to 256, reducing beats to 2 (e.g., 258-256=2). If it was 251, decreasing it would increase the beats (e.g., |248-256|=8). Thus, it was 261 Hz.

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