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Question (31)

QN006042

A sound wave has intensity 18 W/m² across area 3 m². Find energy crossing in 5 s.

(A) 54 J
(B) 90 J
(C) 180 J
(D) 270 J

Correct Answer: D

Explanation:

Energy = 18 × 3 × 5 = 270 J

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Question (32)

QN006043

Which unit is commonly used to express loudness level?

(A) Newton
(B) Pascal
(C) Decibel
(D) Joule

Correct Answer: C

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Question (33)

QN006044

Excessive loud sound can damage

(A) kidneys
(B) vocal cords only
(C) eardrums
(D) bones only

Correct Answer: C

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Question (34)

QN006045

Noise pollution mainly results from

(A) moderate pleasant sounds
(B) excessive unwanted sounds
(C) low intensity sound only
(D) ultrasonic waves only

Correct Answer: B

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Question (35)

QN006046

Which of the following is an effective method to reduce noise pollution?

(A) Increasing loudspeaker volume
(B) Planting trees
(C) Removing silencers from vehicles
(D) Using metal walls everywhere

Correct Answer: B

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Question (36)

QN006047

Sound intensity level is measured using

(A) thermometer
(B) ammeter
(C) sound level meter
(D) barometer

Correct Answer: C

Explanation:

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Question (37)

QN006048

A sound wave carries 90 J through 3 m² area in 5 s. Calculate intensity.

(A) 3 W/m²
(B) 6 W/m²
(C) 9 W/m²
(D) 15 W/m²

Correct Answer: B

Explanation:

Intensity = 90/(3 × 5) = 6 W/m²

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Question (38)

QN006049

The loudness of sound perceived by humans depends on

(A) sensitivity of ear
(B) colour of source
(C) magnetic field
(D) atmospheric pressure only

Correct Answer: A

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Question (39)

QN006050

If amplitude becomes three times, energy becomes

(A) three times
(B) six times
(C) nine times
(D) twenty-seven times

Correct Answer: C

Explanation:

Energy ∝ amplitude²

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Question (40)

QN006051

A sound source emits 400 J energy in 20 s over area 5 m². Intensity is

(A) 2 W/m²
(B) 4 W/m²
(C) 8 W/m²
(D) 20 W/m²

Correct Answer: B

Explanation:

Intensity = 400/(20 × 5) = 4 W/m²

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Question (31)

A sound wave has intensity 18 W/m² across area 3 m². Find energy crossing in 5 s.

Explanation:

Link:

Question (32)

Which unit is commonly used to express loudness level?

Explanation:

Link:

Question (33)

Excessive loud sound can damage

Explanation:

Link:

Question (34)

Noise pollution mainly results from

Explanation:

Link:

Question (35)

Which of the following is an effective method to reduce noise pollution?

Explanation:

Link:

Question (36)

Sound intensity level is measured using

Explanation:

Link:

Question (37)

A sound wave carries 90 J through 3 m² area in 5 s. Calculate intensity.

Explanation:

Link:

Question (38)

The loudness of sound perceived by humans depends on

Explanation:

Link:

Question (39)

If amplitude becomes three times, energy becomes

Explanation:

Link:

Question (40)

A sound source emits 400 J energy in 20 s over area 5 m². Intensity is

Explanation:

Link:

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