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Question (21)

QN006162

In a cinema hall, heavy curtains are used to

(A) increase reflection
(B) absorb sound
(C) increase loudness
(D) increase wavelength

Correct Answer: B

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Question (22)

QN006163

Which phenomenon causes persistence of sound in an auditorium?

(A) Refraction
(B) Reverberation
(C) Diffraction
(D) Dispersion

Correct Answer: B

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Question (23)

QN006164

A sound reflected from a distant building reaches back in 1.5 s. If speed of sound is 340 m/s, distance of building is

(A) 170 m
(B) 255 m
(C) 340 m
(D) 510 m

Correct Answer: B

Explanation:

Distance = vt/2 = 340 × 1.5 / 2 = 255 m

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Question (24)

QN006165

Sound boards are placed behind speakers in halls to

(A) absorb sound
(B) reflect sound uniformly
(C) reduce frequency
(D) increase pitch

Correct Answer: B

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Question (25)

QN006166

Which device uses multiple reflection of sound for medical diagnosis?

(A) Thermometer
(B) Stethoscope
(C) Barometer
(D) Galvanometer

Correct Answer: B

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Question (26)

QN006167

A person standing 68 m from a wall hears an echo after

(A) 0.1 s
(B) 0.2 s
(C) 0.4 s
(D) 0.8 s

Correct Answer: C

Explanation:

Time = 2d/v = 136/340 = 0.4 s

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Question (27)

QN006168

The phenomenon of repeated reflection of sound between walls is called

(A) refraction
(B) reverberation
(C) resonance
(D) interference

Correct Answer: B

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Question (28)

QN006169

Reflection of sound can occur from

(A) only solids
(B) only liquids
(C) all surfaces including solids and liquids
(D) vacuum only

Correct Answer: C

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Question (29)

QN006170

If the distance between listener and reflector decreases, echo time will

(A) increase
(B) decrease
(C) remain same
(D) become infinite

Correct Answer: B

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Question (30)

QN006171

Which material is commonly used for soundproofing?

(A) Steel
(B) Sponge
(C) Glass
(D) Aluminium

Correct Answer: B

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Question (21)

In a cinema hall, heavy curtains are used to

Explanation:

Link:

Question (22)

Which phenomenon causes persistence of sound in an auditorium?

Explanation:

Link:

Question (23)

A sound reflected from a distant building reaches back in 1.5 s. If speed of sound is 340 m/s, distance of building is

Explanation:

Link:

Question (24)

Sound boards are placed behind speakers in halls to

Explanation:

Link:

Question (25)

Which device uses multiple reflection of sound for medical diagnosis?

Explanation:

Link:

Question (26)

A person standing 68 m from a wall hears an echo after

Explanation:

Link:

Question (27)

The phenomenon of repeated reflection of sound between walls is called

Explanation:

Link:

Question (28)

Reflection of sound can occur from

Explanation:

Link:

Question (29)

If the distance between listener and reflector decreases, echo time will

Explanation:

Link:

Question (30)

Which material is commonly used for soundproofing?

Explanation:

Link:

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