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Question (1)

QN006142

The bouncing back of sound after striking a surface is called

(A) refraction
(B) reflection
(C) diffraction
(D) absorption

Correct Answer: B

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Question (2)

QN006143

Reflection of sound follows

(A) Newton’s laws only
(B) laws of reflection
(C) law of gravitation
(D) Ohm’s law

Correct Answer: B

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Question (3)

QN006144

In reflection of sound, the angle of incidence is always

(A) greater than angle of reflection
(B) smaller than angle of reflection
(C) equal to angle of reflection
(D) zero always

Correct Answer: C

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Question (4)

QN006145

The incident sound, reflected sound, and normal at the point of incidence all lie in

(A) different planes
(B) same plane
(C) opposite directions only
(D) vacuum only

Correct Answer: B

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Question (5)

QN006146

An echo is heard when the reflected sound reaches the ear after at least

(A) 0.01 s
(B) 0.05 s
(C) 0.1 s
(D) 1 s

Correct Answer: C

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Question (6)

QN006147

If the speed of sound is 340 m/s, the minimum distance required to hear an echo is approximately

(A) 10 m
(B) 17 m
(C) 34 m
(D) 68 m

Correct Answer: B

Explanation:

Distance = vt/2 = 340 × 0.1 / 2 = 17 m

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Question (7)

QN006148

A person stands 85 m from a wall. If speed of sound is 340 m/s, echo is heard after

(A) 0.25 s
(B) 0.5 s
(C) 1 s
(D) 2 s

Correct Answer: B

Explanation:

Time = 2d/v = 170/340 = 0.5 s

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Question (8)

QN006149

Reflection of sound is maximum from

(A) soft surfaces
(B) rough cloth surfaces
(C) hard polished surfaces
(D) sponge surfaces

Correct Answer: C

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Question (9)

QN006150

Sound absorbing materials are used in auditoriums to

(A) increase echoes
(B) reduce reflection of sound
(C) increase pitch
(D) increase speed of sound

Correct Answer: B

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Question (10)

QN006151

Multiple reflections of sound help in

(A) reducing sound completely
(B) hearing sound at greater distance
(C) stopping vibrations
(D) producing vacuum

Correct Answer: B

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Question (1)

The bouncing back of sound after striking a surface is called

Explanation:

Link:

Question (2)

Reflection of sound follows

Explanation:

Link:

Question (3)

In reflection of sound, the angle of incidence is always

Explanation:

Link:

Question (4)

The incident sound, reflected sound, and normal at the point of incidence all lie in

Explanation:

Link:

Question (5)

An echo is heard when the reflected sound reaches the ear after at least

Explanation:

Link:

Question (6)

If the speed of sound is 340 m/s, the minimum distance required to hear an echo is approximately

Explanation:

Link:

Question (7)

A person stands 85 m from a wall. If speed of sound is 340 m/s, echo is heard after

Explanation:

Link:

Question (8)

Reflection of sound is maximum from

Explanation:

Link:

Question (9)

Sound absorbing materials are used in auditoriums to

Explanation:

Link:

Question (10)

Multiple reflections of sound help in

Explanation:

Link:

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