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Question (11)

QN006152

Megaphones work on the principle of

(A) refraction of sound
(B) absorption of sound
(C) multiple reflection of sound
(D) magnetic effect of sound

Correct Answer: C

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Question (12)

QN006153

Stethoscope works mainly due to

(A) refraction of sound
(B) multiple reflection of sound
(C) dispersion of sound
(D) diffraction of sound

Correct Answer: B

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Question (13)

QN006154

The repeated reflection of sound in a large hall resulting in persistence of sound is called

(A) echo
(B) reverberation
(C) refraction
(D) diffraction

Correct Answer: B

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Question (14)

QN006155

Excessive reverberation in auditoriums can be reduced by using

(A) marble walls
(B) metal sheets
(C) sound absorbing materials
(D) glass surfaces only

Correct Answer: C

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Question (15)

QN006156

A reflected sound heard separately from the original sound is called

(A) vibration
(B) resonance
(C) echo
(D) pitch

Correct Answer: C

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Question (16)

QN006157

A person hears an echo 2 seconds after shouting. If speed of sound is 340 m/s, the reflector is at a distance of

(A) 170 m
(B) 340 m
(C) 510 m
(D) 680 m

Correct Answer: B

Explanation:

Distance = vt/2 = 340 × 2 / 2 = 340 m

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Question (17)

QN006158

A sound wave travels 1020 m in 3 seconds during reflection experiment. Speed of sound is

(A) 170 m/s
(B) 300 m/s
(C) 340 m/s
(D) 680 m/s

Correct Answer: C

Explanation:

Speed = distance/time = 1020/3 = 340 m/s

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Question (18)

QN006159

Which surface is best suited for sound reflection?

(A) Curtains
(B) Foam
(C) Concrete wall
(D) Carpet

Correct Answer: C

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Question (19)

QN006160

The minimum time gap between original sound and reflected sound to distinguish echo is

(A) 0.01 s
(B) 0.05 s
(C) 0.1 s
(D) 0.5 s

Correct Answer: C

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Question (20)

QN006161

A child claps near a hill and hears echo after 3 seconds. Distance of hill from child is

(A) 255 m
(B) 340 m
(C) 510 m
(D) 1020 m

Correct Answer: C

Explanation:

Distance = vt/2 = 340 × 3 / 2 = 510 m

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Question (11)

Megaphones work on the principle of

Explanation:

Link:

Question (12)

Stethoscope works mainly due to

Explanation:

Link:

Question (13)

The repeated reflection of sound in a large hall resulting in persistence of sound is called

Explanation:

Link:

Question (14)

Excessive reverberation in auditoriums can be reduced by using

Explanation:

Link:

Question (15)

A reflected sound heard separately from the original sound is called

Explanation:

Link:

Question (16)

A person hears an echo 2 seconds after shouting. If speed of sound is 340 m/s, the reflector is at a distance of

Explanation:

Link:

Question (17)

A sound wave travels 1020 m in 3 seconds during reflection experiment. Speed of sound is

Explanation:

Link:

Question (18)

Which surface is best suited for sound reflection?

Explanation:

Link:

Question (19)

The minimum time gap between original sound and reflected sound to distinguish echo is

Explanation:

Link:

Question (20)

A child claps near a hill and hears echo after 3 seconds. Distance of hill from child is

Explanation:

Link:

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