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Question (21)

QN003721

A sound wave completes 120 oscillations in 3 seconds. Its frequency is

(A) 30 Hz
(B) 40 Hz
(C) 60 Hz
(D) 360 Hz

Correct Answer: B

Explanation:

Frequency = 120/3 = 40 Hz

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Question (22)

QN003722

A sound wave has frequency 50 Hz. Number of oscillations completed in 2 minutes is

(A) 100
(B) 600
(C) 3000
(D) 6000

Correct Answer: D

Explanation:

Number of oscillations = 50 × 120 = 6000

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Question (23)

QN003723

If the time period of a wave decreases, its frequency

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

Correct Answer: B

Explanation:

Frequency is inversely proportional to time period.

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Question (24)

QN003724

The distance between two consecutive compressions is

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

Correct Answer: C

Explanation:

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Question (25)

QN003725

A sound wave has wavelength 4 m and frequency 85 Hz. Its speed is

(A) 21.25 m/s
(B) 81 m/s
(C) 340 m/s
(D) 425 m/s

Correct Answer: C

Explanation:

v = fλ = 85 × 4 = 340 m/s

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Question (26)

QN003726

The speed of sound in air is 340 m/s. For a frequency of 170 Hz, the wavelength is

(A) 0.5 m
(B) 1 m
(C) 2 m
(D) 4 m

Correct Answer: C

Explanation:

λ = v/f = 340/170 = 2 m

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Question (27)

QN003727

A sound wave travels with speed 1500 m/s in water and has wavelength 3 m. Its frequency is

(A) 500 Hz
(B) 1500 Hz
(C) 4500 Hz
(D) 3000 Hz

Correct Answer: A

Explanation:

f = v/λ = 1500/3 = 500 Hz

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Question (28)

QN003728

Sound travels fastest in

(A) air
(B) vacuum
(C) water
(D) steel

Correct Answer: D

Explanation:

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Question (29)

QN003729

The approximate speed of sound in water is

(A) 340 m/s
(B) 1500 m/s
(C) 5000 m/s
(D) 300000 km/s

Correct Answer: B

Explanation:

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Question (30)

QN003730

If sound takes 2 s to travel through air over a distance, how much time will it approximately take through steel for the same distance?

(A) 0.14 s
(B) 1 s
(C) 2 s
(D) 10 s

Correct Answer: A

Explanation:

Distance same, so time inversely proportional to speed.

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Question (21)

A sound wave completes 120 oscillations in 3 seconds. Its frequency is

Explanation:

Link:

Question (22)

A sound wave has frequency 50 Hz. Number of oscillations completed in 2 minutes is

Explanation:

Link:

Question (23)

If the time period of a wave decreases, its frequency

Explanation:

Link:

Question (24)

The distance between two consecutive compressions is

Explanation:

Link:

Question (25)

A sound wave has wavelength 4 m and frequency 85 Hz. Its speed is

Explanation:

Link:

Question (26)

The speed of sound in air is 340 m/s. For a frequency of 170 Hz, the wavelength is

Explanation:

Link:

Question (27)

A sound wave travels with speed 1500 m/s in water and has wavelength 3 m. Its frequency is

Explanation:

Link:

Question (28)

Sound travels fastest in

Explanation:

Link:

Question (29)

The approximate speed of sound in water is

Explanation:

Link:

Question (30)

If sound takes 2 s to travel through air over a distance, how much time will it approximately take through steel for the same distance?

Explanation:

Link:

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