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Question (11)

QN006022

If the amplitude of a wave is reduced to half, the energy becomes

(A) half
(B) one-fourth
(C) double
(D) unchanged

Correct Answer: B

Explanation:

Energy ∝ amplitude²

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Question (12)

QN006023

A sound wave of intensity 8 W/m² falls on a surface of area 2 m². Sound energy crossing per second is

(A) 4 W
(B) 8 W
(C) 10 W
(D) 16 W

Correct Answer: D

Explanation:

Power = Intensity × Area = 8 × 2 = 16 W

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Question (13)

QN006024

A sound source emits 24 J of energy in 3 s through an area of 2 m². Intensity is

(A) 2 W/m²
(B) 4 W/m²
(C) 6 W/m²
(D) 8 W/m²

Correct Answer: B

Explanation:

Intensity = Energy/(Area × Time) = 24/(2 × 3) = 4 W/m²

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Question (14)

QN006025

A sound wave carries 120 J of energy in 10 s through an area of 4 m². Find intensity.

(A) 1 W/m²
(B) 2 W/m²
(C) 3 W/m²
(D) 12 W/m²

Correct Answer: C

Explanation:

Intensity = 120/(4 × 10) = 3 W/m²

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Question (15)

QN006026

A sound source produces power of 50 W uniformly over area 10 m². Intensity is

(A) 2 W/m²
(B) 5 W/m²
(C) 10 W/m²
(D) 500 W/m²

Correct Answer: B

Explanation:

Intensity = Power/Area = 50/10 = 5 W/m²

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Question (16)

QN006027

If sound intensity becomes four times, amplitude becomes

(A) half
(B) double
(C) four times
(D) unchanged

Correct Answer: B

Explanation:

Intensity ∝ amplitude²

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Question (17)

QN006028

Which statement is correct about sound energy?

(A) Sound waves do not carry energy
(B) Sound waves carry energy from one place to another
(C) Sound energy remains fixed at source
(D) Sound cannot transfer energy to matter

Correct Answer: B

Explanation:

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Question (18)

QN006029

Vibrations of paper pieces near a loudspeaker show that sound

(A) destroys matter
(B) carries energy
(C) produces light
(D) creates vacuum

Correct Answer: B

Explanation:

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Question (19)

QN006030

Intensity of sound depends on

(A) amplitude and distance
(B) colour of source
(C) magnetic field
(D) shape of room only

Correct Answer: A

Explanation:

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Question (20)

QN006031

The loudness of sound heard by a listener decreases when

(A) amplitude increases
(B) distance from source increases
(C) frequency increases
(D) wavelength decreases

Correct Answer: B

Explanation:

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Question (11)

If the amplitude of a wave is reduced to half, the energy becomes

Explanation:

Link:

Question (12)

A sound wave of intensity 8 W/m² falls on a surface of area 2 m². Sound energy crossing per second is

Explanation:

Link:

Question (13)

A sound source emits 24 J of energy in 3 s through an area of 2 m². Intensity is

Explanation:

Link:

Question (14)

A sound wave carries 120 J of energy in 10 s through an area of 4 m². Find intensity.

Explanation:

Link:

Question (15)

A sound source produces power of 50 W uniformly over area 10 m². Intensity is

Explanation:

Link:

Question (16)

If sound intensity becomes four times, amplitude becomes

Explanation:

Link:

Question (17)

Which statement is correct about sound energy?

Explanation:

Link:

Question (18)

Vibrations of paper pieces near a loudspeaker show that sound

Explanation:

Link:

Question (19)

Intensity of sound depends on

Explanation:

Link:

Question (20)

The loudness of sound heard by a listener decreases when

Explanation:

Link:

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