Beats observable when frequencies are: MCQ with Answer and Explanation

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Beats observable when frequencies are:

A. Very different

B. Identical

C. Slightly different

D. Any values

Answer: Option C

Solution (By JKSSB Mock Tests)

Beats: interference of close frequencies (Δf small, typically

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Question #1

TIR used in:

A. Both

B. Neither

C. Diamond brilliance

D. Optical fibers

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Correct Answer: Option A

Explanation:
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 #2

An object is placed at the centre of curvature of a concave mirror. The image formed is

A. Real, inverted, same size

B. Real, inverted, diminished

C. Virtual, erect, magnified

D. Virtual, inverted, same size

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Correct Answer: Option A

Explanation:
At C (centre of curvature), image is at C, real, inverted, same size. At F, image at infinity. Beyond C, between F and C, diminished. Object between F and C gives beyond C, enlarged.

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Question #3

The speed of sound is maximum in

A. Iron

B. Air at 20°C

C. Air at 0°C

D. Water

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Correct Answer: Option A

Explanation:
Sound travels fastest in solids. Iron ~5000 m/s.

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