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Question (31)

QN006172

A reflected sound returns after 0.8 s. If speed of sound is 330 m/s, reflector distance is

(A) 66 m
(B) 132 m
(C) 264 m
(D) 330 m

Correct Answer: B

Explanation:

Distance = vt/2 = 330 × 0.8 / 2 = 132 m

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Question (32)

QN006173

Sound waves are reflected similarly to

(A) magnetic waves only
(B) water waves only
(C) light waves
(D) heat waves only

Correct Answer: C

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Question (33)

QN006174

In large halls, curved ceilings are avoided because they

(A) absorb all sound
(B) produce uneven reflection
(C) reduce intensity completely
(D) stop vibrations

Correct Answer: B

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Question (34)

QN006175

SONAR works on the principle of

(A) refraction of sound
(B) absorption of sound
(C) reflection of sound
(D) interference of light

Correct Answer: C

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Question (35)

QN006176

A ship receives reflected ultrasonic waves after 4 seconds. If speed in seawater is 1500 m/s, depth of sea is

(A) 750 m
(B) 1500 m
(C) 3000 m
(D) 6000 m

Correct Answer: C

Explanation:

Depth = vt/2 = 1500 × 4 / 2 = 3000 m

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Question (36)

QN006177

Which condition is necessary for clear hearing in an auditorium?

(A) Excessive reverberation
(B) Controlled reflection of sound
(C) Complete absorption of sound
(D) No reflection at all

Correct Answer: B

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Question (37)

QN006178

A person hears an echo after 0.2 s. If speed of sound is 340 m/s, reflector distance is

(A) 17 m
(B) 34 m
(C) 68 m
(D) 136 m

Correct Answer: B

Explanation:

Distance = vt/2 = 340 × 0.2 / 2 = 34 m

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Question (38)

QN006179

Multiple reflection of sound is commonly used in

(A) electric heaters
(B) speaking tubes
(C) magnets
(D) batteries

Correct Answer: B

Explanation:

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Question (39)

QN006180

Reverberation becomes excessive when a room has

(A) absorbing materials
(B) soft furnishings
(C) bare hard walls
(D) carpets and curtains

Correct Answer: C

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Question (40)

QN006181

Which statement is correct regarding reflection of sound?

(A) Sound cannot reflect from liquids
(B) Echo is heard due to reflection of sound
(C) Reflection changes frequency of sound
(D) Reflection occurs only in vacuum

Correct Answer: B

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Question (31)

A reflected sound returns after 0.8 s. If speed of sound is 330 m/s, reflector distance is

Explanation:

Link:

Question (32)

Sound waves are reflected similarly to

Explanation:

Link:

Question (33)

In large halls, curved ceilings are avoided because they

Explanation:

Link:

Question (34)

SONAR works on the principle of

Explanation:

Link:

Question (35)

A ship receives reflected ultrasonic waves after 4 seconds. If speed in seawater is 1500 m/s, depth of sea is

Explanation:

Link:

Question (36)

Which condition is necessary for clear hearing in an auditorium?

Explanation:

Link:

Question (37)

A person hears an echo after 0.2 s. If speed of sound is 340 m/s, reflector distance is

Explanation:

Link:

Question (38)

Multiple reflection of sound is commonly used in

Explanation:

Link:

Question (39)

Reverberation becomes excessive when a room has

Explanation:

Link:

Question (40)

Which statement is correct regarding reflection of sound?

Explanation:

Link:

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