The minimum distance to hear an echo (persistence of hearing 0.1 s, speed 340 m/s) is MCQ with Answer and Explanation

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The minimum distance to hear an echo (persistence of hearing 0.1 s, speed 340 m/s) is

A. 68 m

B. 34 m

C. 10 m

D. 17 m

Answer: Option D

Solution (By JKSSB Mock Tests)

d = (v×t)/2 = (340×0.1)/2 = 17 m.

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Question #1

The frequency of a wave is 1 kHz. Its time period is

A. 1000 s

B. 1 s

C. 0.01 s

D. 0.001 s

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Correct Answer: Option D

Explanation:
T = 1/f = 1/1000 = 0.001 s = 1 ms.

This question belongs to: Science Physics

Question #2

Diffraction limits resolution because:

A. Light bends around edges, blurring images

B. Mirrors reflect poorly

C. Atmosphere distorts

D. Lenses absorb light

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Correct Answer: Option A

Explanation:
Diffraction spreads light through apertures, creating Airy patterns instead of points. Fundamental limit: θ_min ≈ 1.22λ/D (Rayleigh criterion). Memory tip: 'Diffraction limit: smaller λ or larger aperture ⇒ better resolution'. Wave optics concept frequently tested in competitive exams.

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Question #3

The process of change from solid directly to vapour is called

A. Melting

B. Freezing

C. Condensation

D. Sublimation

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Correct Answer: Option D

Explanation:
Sublimation: solid → gas without liquid phase. Example: camphor, naphthalene balls, dry ice (solid CO₂). Deposition is reverse. Latent heat of sublimation involved.

This question belongs to: Science Physics

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