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Question (21)

QN006122

A sound wave completes 500 oscillations in 5 seconds. Frequency is

(A) 50 Hz
(B) 100 Hz
(C) 250 Hz
(D) 500 Hz

Correct Answer: B

Explanation:

Frequency = 500/5 = 100 Hz

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Question (22)

QN006123

A wave has time period 0.01 s. Frequency is

(A) 10 Hz
(B) 50 Hz
(C) 100 Hz
(D) 200 Hz

Correct Answer: C

Explanation:

f = 1/T = 1/0.01 = 100 Hz

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Question (23)

QN006124

A sound wave travels 990 m in 3 seconds. Speed is

(A) 110 m/s
(B) 220 m/s
(C) 330 m/s
(D) 660 m/s

Correct Answer: C

Explanation:

Speed = distance/time = 990/3 = 330 m/s

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Question (24)

QN006125

A sound wave of frequency 500 Hz travels at 350 m/s. Wavelength is

(A) 0.7 m
(B) 1.4 m
(C) 7 m
(D) 70 m

Correct Answer: A

Explanation:

λ = v/f = 350/500 = 0.7 m

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Question (25)

QN006126

The distance between two consecutive compressions is equal to

(A) amplitude
(B) wavelength
(C) frequency
(D) intensity

Correct Answer: B

Explanation:

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Question (26)

QN006127

The time taken by a wave to travel one wavelength is called

(A) speed
(B) frequency
(C) time period
(D) amplitude

Correct Answer: C

Explanation:

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Question (27)

QN006128

Which characteristic of sound is measured in decibel?

(A) Pitch
(B) Loudness
(C) Wavelength
(D) Frequency

Correct Answer: B

Explanation:

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Question (28)

QN006129

A sound wave has wavelength 4 m and frequency 80 Hz. Speed is

(A) 20 m/s
(B) 160 m/s
(C) 320 m/s
(D) 640 m/s

Correct Answer: C

Explanation:

v = fλ = 80 × 4 = 320 m/s

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Question (29)

QN006130

If wavelength increases while speed remains constant, frequency

(A) increases
(B) decreases
(C) remains unchanged
(D) becomes zero

Correct Answer: B

Explanation:

Frequency is inversely proportional to wavelength.

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Question (30)

QN006131

A wave with frequency 250 Hz has time period

(A) 0.004 s
(B) 0.04 s
(C) 0.4 s
(D) 4 s

Correct Answer: A

Explanation:

T = 1/f = 1/250 = 0.004 s

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Question (21)

A sound wave completes 500 oscillations in 5 seconds. Frequency is

Explanation:

Link:

Question (22)

A wave has time period 0.01 s. Frequency is

Explanation:

Link:

Question (23)

A sound wave travels 990 m in 3 seconds. Speed is

Explanation:

Link:

Question (24)

A sound wave of frequency 500 Hz travels at 350 m/s. Wavelength is

Explanation:

Link:

Question (25)

The distance between two consecutive compressions is equal to

Explanation:

Link:

Question (26)

The time taken by a wave to travel one wavelength is called

Explanation:

Link:

Question (27)

Which characteristic of sound is measured in decibel?

Explanation:

Link:

Question (28)

A sound wave has wavelength 4 m and frequency 80 Hz. Speed is

Explanation:

Link:

Question (29)

If wavelength increases while speed remains constant, frequency

Explanation:

Link:

Question (30)

A wave with frequency 250 Hz has time period

Explanation:

Link:

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