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Question (11)

QN005972

A wave has wavelength 5 m and speed 350 m/s. Find its frequency.

(A) 50 Hz
(B) 60 Hz
(C) 70 Hz
(D) 1750 Hz

Correct Answer: C

Explanation:

f = v/λ = 350/5 = 70 Hz

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Question (12)

QN005973

If the frequency of a wave doubles while speed remains constant, its wavelength becomes

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

Correct Answer: B

Explanation:

Frequency and wavelength are inversely proportional.

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Question (13)

QN005974

The speed of sound can be calculated using

(A) v = f/T
(B) v = λ/f
(C) v = fλ
(D) v = T/λ

Correct Answer: C

Explanation:

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Question (14)

QN005975

A sound wave travels 680 m in 2 seconds. Its speed is

(A) 170 m/s
(B) 340 m/s
(C) 510 m/s
(D) 680 m/s

Correct Answer: B

Explanation:

Speed = distance/time = 680/2 = 340 m/s

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Question (15)

QN005976

If wavelength is 4 m and speed is 320 m/s, the frequency is

(A) 40 Hz
(B) 60 Hz
(C) 80 Hz
(D) 1280 Hz

Correct Answer: C

Explanation:

f = v/λ = 320/4 = 80 Hz

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Question (16)

QN005977

A wave has frequency 25 Hz. Number of oscillations completed in 8 s is

(A) 25
(B) 50
(C) 100
(D) 200

Correct Answer: D

Explanation:

Oscillations = frequency × time = 25 × 8 = 200

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Question (17)

QN005978

Which property of sound determines its pitch?

(A) Intensity
(B) Frequency
(C) Amplitude
(D) Speed

Correct Answer: B

Explanation:

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Question (18)

QN005979

A sound with high pitch has

(A) low frequency
(B) high frequency
(C) low amplitude
(D) large wavelength only

Correct Answer: B

Explanation:

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Question (19)

QN005980

Loudness of sound mainly depends on

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

Correct Answer: C

Explanation:

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Question (20)

QN005981

A louder sound has

(A) smaller amplitude
(B) greater amplitude
(C) lower frequency
(D) smaller wavelength

Correct Answer: B

Explanation:

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Question (11)

A wave has wavelength 5 m and speed 350 m/s. Find its frequency.

Explanation:

Link:

Question (12)

If the frequency of a wave doubles while speed remains constant, its wavelength becomes

Explanation:

Link:

Question (13)

The speed of sound can be calculated using

Explanation:

Link:

Question (14)

A sound wave travels 680 m in 2 seconds. Its speed is

Explanation:

Link:

Question (15)

If wavelength is 4 m and speed is 320 m/s, the frequency is

Explanation:

Link:

Question (16)

A wave has frequency 25 Hz. Number of oscillations completed in 8 s is

Explanation:

Link:

Question (17)

Which property of sound determines its pitch?

Explanation:

Link:

Question (18)

A sound with high pitch has

Explanation:

Link:

Question (19)

Loudness of sound mainly depends on

Explanation:

Link:

Question (20)

A louder sound has

Explanation:

Link:

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