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Question (21)

QN005982

Human audible range is

(A) 2 Hz to 200 Hz
(B) 20 Hz to 20 kHz
(C) 20 kHz to 40 kHz
(D) below 20 Hz only

Correct Answer: B

Explanation:

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Question (22)

QN005983

Sound waves below 20 Hz are called

(A) ultrasonic
(B) audible
(C) infrasonic
(D) supersonic

Correct Answer: C

Explanation:

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Question (23)

QN005984

Sound waves above 20 kHz are called

(A) infrasonic
(B) ultrasonic
(C) subsonic
(D) seismic

Correct Answer: B

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Question (24)

QN005985

Which animal commonly uses ultrasonic waves for echolocation?

(A) Cow
(B) Elephant
(C) Bat
(D) Camel

Correct Answer: C

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Question (25)

QN005986

The speed of sound in air at room temperature is approximately

(A) 34 m/s
(B) 170 m/s
(C) 340 m/s
(D) 3000 m/s

Correct Answer: C

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Question (26)

QN005987

A sound wave has frequency 400 Hz and speed 320 m/s. Its wavelength is

(A) 0.4 m
(B) 0.8 m
(C) 1.25 m
(D) 2 m

Correct Answer: B

Explanation:

λ = v/f = 320/400 = 0.8 m

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Question (27)

QN005988

If the time period of a sound wave is 0.01 s, its frequency is

(A) 10 Hz
(B) 50 Hz
(C) 100 Hz
(D) 1000 Hz

Correct Answer: C

Explanation:

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

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Question (28)

QN005989

The number of compressions passing a point in 1 second equals

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

Correct Answer: B

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Question (29)

QN005990

A sound wave has wavelength 6.8 m and frequency 50 Hz. Calculate its speed.

(A) 170 m/s
(B) 300 m/s
(C) 340 m/s
(D) 680 m/s

Correct Answer: C

Explanation:

v = fλ = 50 × 6.8 = 340 m/s

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Question (30)

QN005991

If 30 compressions pass a point in 2 seconds, the frequency is

(A) 10 Hz
(B) 15 Hz
(C) 30 Hz
(D) 60 Hz

Correct Answer: B

Explanation:

f = 30/2 = 15 Hz

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