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Question (41)

QN006052

Which statement correctly distinguishes loudness and pitch?

(A) Loudness depends on frequency only
(B) Pitch depends on amplitude only
(C) Loudness depends on amplitude while pitch depends on frequency
(D) Both depend only on wavelength

Correct Answer: C

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Question (42)

QN006053

A wave of intensity 30 W/m² acts on area 2 m² for 4 s. Energy transferred is

(A) 60 J
(B) 120 J
(C) 180 J
(D) 240 J

Correct Answer: D

Explanation:

Energy = 30 × 2 × 4 = 240 J

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Question (43)

QN006054

Continuous exposure to very loud sounds may lead to

(A) improved hearing
(B) permanent hearing loss
(C) stronger vocal cords
(D) better concentration

Correct Answer: B

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Question (44)

QN006055

Which sound is considered noise?

(A) Pleasant music
(B) Regular classroom discussion
(C) Unwanted disturbing sound
(D) Soft instrumental tune

Correct Answer: C

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Question (45)

QN006056

A sound wave of intensity 50 W/m² passes through area 6 m². Find power transmitted.

(A) 56 W
(B) 150 W
(C) 300 W
(D) 600 W

Correct Answer: C

Explanation:

Power = 50 × 6 = 300 W

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Question (46)

QN006057

If intensity of sound is reduced to one-fourth, amplitude becomes

(A) half
(B) one-fourth
(C) double
(D) four times

Correct Answer: A

Explanation:

Intensity ∝ amplitude²

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Question (47)

QN006058

Trees help in controlling noise pollution because they

(A) increase sound production
(B) absorb and scatter sound
(C) produce ultrasonic waves
(D) reflect all sound completely

Correct Answer: B

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Question (48)

QN006059

Sound energy passing through 12 m² area in 3 s is 720 J. Intensity is

(A) 10 W/m²
(B) 15 W/m²
(C) 20 W/m²
(D) 30 W/m²

Correct Answer: C

Explanation:

Intensity = 720/(12 × 3) = 20 W/m²

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Question (49)

QN006060

Which of the following has maximum sound energy?

(A) Wave with smallest amplitude
(B) Wave with zero amplitude
(C) Wave with greatest amplitude
(D) Wave with longest wavelength only

Correct Answer: C

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Question (50)

QN006061

A loudspeaker emits sound intensity 40 W/m² through area 5 m². Energy emitted in 6 s is

(A) 200 J
(B) 400 J
(C) 800 J
(D) 1200 J

Correct Answer: D

Explanation:

Energy = Intensity × Area × Time = 40 × 5 × 6 = 1200 J

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Question (41)

Which statement correctly distinguishes loudness and pitch?

Explanation:

Link:

Question (42)

A wave of intensity 30 W/m² acts on area 2 m² for 4 s. Energy transferred is

Explanation:

Link:

Question (43)

Continuous exposure to very loud sounds may lead to

Explanation:

Link:

Question (44)

Which sound is considered noise?

Explanation:

Link:

Question (45)

A sound wave of intensity 50 W/m² passes through area 6 m². Find power transmitted.

Explanation:

Link:

Question (46)

If intensity of sound is reduced to one-fourth, amplitude becomes

Explanation:

Link:

Question (47)

Trees help in controlling noise pollution because they

Explanation:

Link:

Question (48)

Sound energy passing through 12 m² area in 3 s is 720 J. Intensity is

Explanation:

Link:

Question (49)

Which of the following has maximum sound energy?

Explanation:

Link:

Question (50)

A loudspeaker emits sound intensity 40 W/m² through area 5 m². Energy emitted in 6 s is

Explanation:

Link:

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