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Question (31)

QN0026307

The SI unit of wavelength is

(A) metre
(B) hertz
(C) second
(D) decibel

Correct Answer: A

Explanation:

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Question (32)

QN0026308

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 (33)

QN0026309

A sound wave of 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 (34)

QN0026310

If wavelength increases while speed remains constant, frequency

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

Correct Answer: B

Explanation:

Frequency is inversely proportional to wavelength.

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Question (35)

QN0026311

A reflected sound returns after 0.8 s. If speed of sound is 330 m/s, reflector distance is

(A) 66 m
(B) 132 m
(C) 264 m
(D) 330 m

Correct Answer: B

Explanation:

Distance = vt/2 = 330 × 0.8 / 2 = 132 m

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Question (36)

QN0026312

Which surface reflects sound best?

(A) Curtain
(B) Foam
(C) Concrete wall
(D) Carpet

Correct Answer: C

Explanation:

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Question (37)

QN0026313

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 (38)

QN0026314

Which device uses reflected ultrasonic waves to measure depth underwater?

(A) Periscope
(B) SONAR
(C) Telescope
(D) Microscope

Correct Answer: B

Explanation:

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Question (39)

QN0026315

A sound wave has wavelength 1.5 m and frequency 240 Hz. Speed is

(A) 120 m/s
(B) 240 m/s
(C) 360 m/s
(D) 480 m/s

Correct Answer: C

Explanation:

v = fλ = 240 × 1.5 = 360 m/s

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