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Question (21)

QN006032

If the distance from a sound source is doubled, intensity generally

(A) increases
(B) remains same
(C) decreases
(D) becomes zero instantly

Correct Answer: C

Explanation:

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Question (22)

QN006033

A sound wave transfers 200 J in 5 s across area 10 m². Find intensity.

(A) 2 W/m²
(B) 4 W/m²
(C) 20 W/m²
(D) 40 W/m²

Correct Answer: B

Explanation:

Intensity = 200/(10 × 5) = 4 W/m²

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Question (23)

QN006034

A machine emits sound with intensity 15 W/m² over an area of 4 m². Power emitted is

(A) 19 W
(B) 30 W
(C) 45 W
(D) 60 W

Correct Answer: D

Explanation:

Power = Intensity × Area = 15 × 4 = 60 W

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Question (24)

QN006035

The intensity of a sound wave is 12 W/m². Area exposed is 5 m². Energy transferred in 2 s is

(A) 24 J
(B) 60 J
(C) 120 J
(D) 240 J

Correct Answer: C

Explanation:

Energy = Intensity × Area × Time = 12 × 5 × 2 = 120 J

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Question (25)

QN006036

Which of the following produces the loudest sound?

(A) Smallest amplitude
(B) Largest amplitude
(C) Lowest frequency
(D) Longest wavelength

Correct Answer: B

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Question (26)

QN006037

A sound wave with amplitude 4 cm has energy E. Another wave has amplitude 8 cm. Its energy is

(A) E/2
(B) 2E
(C) 4E
(D) 8E

Correct Answer: C

Explanation:

Energy ∝ amplitude²

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Question (27)

QN006038

A sound wave transfers 360 J through area 6 m² in 3 s. Intensity is

(A) 10 W/m²
(B) 20 W/m²
(C) 30 W/m²
(D) 60 W/m²

Correct Answer: B

Explanation:

Intensity = 360/(6 × 3) = 20 W/m²

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Question (28)

QN006039

A speaker produces sound intensity 25 W/m². How much power crosses area 8 m²?

(A) 100 W
(B) 150 W
(C) 200 W
(D) 250 W

Correct Answer: C

Explanation:

Power = 25 × 8 = 200 W

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Question (29)

QN006040

If intensity of sound becomes nine times, amplitude becomes

(A) three times
(B) nine times
(C) one-third
(D) unchanged

Correct Answer: A

Explanation:

Intensity ∝ amplitude²

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Question (30)

QN006041

The energy carried by sound waves is maximum when

(A) amplitude is maximum
(B) amplitude is zero
(C) frequency is zero
(D) wavelength is infinite

Correct Answer: A

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Question (21)

If the distance from a sound source is doubled, intensity generally

Explanation:

Link:

Question (22)

A sound wave transfers 200 J in 5 s across area 10 m². Find intensity.

Explanation:

Link:

Question (23)

A machine emits sound with intensity 15 W/m² over an area of 4 m². Power emitted is

Explanation:

Link:

Question (24)

The intensity of a sound wave is 12 W/m². Area exposed is 5 m². Energy transferred in 2 s is

Explanation:

Link:

Question (25)

Which of the following produces the loudest sound?

Explanation:

Link:

Question (26)

A sound wave with amplitude 4 cm has energy E. Another wave has amplitude 8 cm. Its energy is

Explanation:

Link:

Question (27)

A sound wave transfers 360 J through area 6 m² in 3 s. Intensity is

Explanation:

Link:

Question (28)

A speaker produces sound intensity 25 W/m². How much power crosses area 8 m²?

Explanation:

Link:

Question (29)

If intensity of sound becomes nine times, amplitude becomes

Explanation:

Link:

Question (30)

The energy carried by sound waves is maximum when

Explanation:

Link:

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