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Question (31)

QN005992

Which graph characteristic represents amplitude in a sound wave?

(A) Horizontal length
(B) Vertical height from mean position
(C) Number of cycles only
(D) Speed of wave

Correct Answer: B

Explanation:

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Question (32)

QN005993

The wavelength of a sound wave becomes shorter when

(A) frequency decreases
(B) speed becomes zero
(C) frequency increases
(D) amplitude decreases

Correct Answer: C

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Question (33)

QN005994

A wave travelling with speed 360 m/s has wavelength 3 m. Its frequency is

(A) 90 Hz
(B) 100 Hz
(C) 120 Hz
(D) 1080 Hz

Correct Answer: C

Explanation:

f = v/λ = 360/3 = 120 Hz

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Question (34)

QN005995

Which quantity is inversely proportional to frequency?

(A) Speed
(B) Wavelength
(C) Time period
(D) Amplitude

Correct Answer: C

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Question (35)

QN005996

If the frequency of a wave is tripled and speed remains same, wavelength becomes

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

Correct Answer: B

Explanation:

Wavelength is inversely proportional to frequency.

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Question (36)

QN005997

A sound wave has speed 330 m/s and time period 0.01 s. Its wavelength is

(A) 0.33 m
(B) 3.3 m
(C) 33 m
(D) 3300 m

Correct Answer: B

Explanation:

λ = vT = 330 × 0.01 = 3.3 m

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Question (37)

QN005998

Which quantity remains constant for sound travelling in the same medium?

(A) Frequency
(B) Speed
(C) Amplitude
(D) Time period

Correct Answer: B

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Question (38)

QN005999

A shrill sound is produced due to

(A) low frequency
(B) high amplitude
(C) high frequency
(D) low intensity

Correct Answer: C

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Question (39)

QN006000

A sound wave with greater intensity carries

(A) less energy
(B) more energy
(C) zero energy
(D) only heat energy

Correct Answer: B

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Question (40)

QN006001

A sound source vibrates 500 times in 10 seconds. Its frequency is

(A) 5 Hz
(B) 50 Hz
(C) 100 Hz
(D) 5000 Hz

Correct Answer: B

Explanation:

f = 500/10 = 50 Hz

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Question (31)

Which graph characteristic represents amplitude in a sound wave?

Explanation:

Link:

Question (32)

The wavelength of a sound wave becomes shorter when

Explanation:

Link:

Question (33)

A wave travelling with speed 360 m/s has wavelength 3 m. Its frequency is

Explanation:

Link:

Question (34)

Which quantity is inversely proportional to frequency?

Explanation:

Link:

Question (35)

If the frequency of a wave is tripled and speed remains same, wavelength becomes

Explanation:

Link:

Question (36)

A sound wave has speed 330 m/s and time period 0.01 s. Its wavelength is

Explanation:

Link:

Question (37)

Which quantity remains constant for sound travelling in the same medium?

Explanation:

Link:

Question (38)

A shrill sound is produced due to

Explanation:

Link:

Question (39)

A sound wave with greater intensity carries

Explanation:

Link:

Question (40)

A sound source vibrates 500 times in 10 seconds. Its frequency is

Explanation:

Link:

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