Practice test

Sound and acoustics - Test Set 4

Review 20 exam-focused questions with detailed explanations, then start the interactive test when you are ready.

20 questions

Questions and explanations

  1. Question 1

    What is the velocity of sound in air?
    1. 220 m/s
    2. 232 m/s
    3. 343 m/s
    4. 110 m/s
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  2. Question 2

    The sound of thunder is heard much later than the flash of light is visible. What does it represent?
    1. The speed of sound is much less than the speed of light.
    2. The speed of sound is three times the speed of light.
    3. The speed of sound is twice the speed of light.
    4. The speed of sound is equal to the speed of light.
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  3. Question 3

    Which of the following statements is correct?
    1. If the constituents of the medium oscillate along the direction of wave propagation, we call the wave a transverse wave.
    2. The minimum distance between two points in a wave having the same phase at a particular instant of time is called the wavelength.
    3. If the constituents of the medium oscillate perpendicular to the direction of wave propagation, we call the wave a longitudinal wave.
    4. Frequency of a wave is the number of oscillations of each constituent Particle in the vibrating medium per minute.
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  4. Question 4

    What is the rate at which a wave moves through the water, and is measured in knots?
    1. Wave height
    2. Wave crest and trough
    3. Wave frequency
    4. Wave speed
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  5. Question 5

    What is the frequency of an object if we know that it oscillates 100 times in 5 seconds?
    1. 20 Hz
    2. 200 Hz
    3. 100 Hz
    4. 50 Hz
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  6. Question 6

    How long will a sound wave take to travel 1.5km, which has a frequency of 5 kHz and wavelength of 6 cm?
    1. 50 seconds
    2. 25 seconds
    3. 2.5 seconds
    4. 5 seconds
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  7. Question 7

    What is the frequency (f) of a wave with a period of 0.04 seconds?
    1. 50 Hz
    2. 25 Hz
    3. 40 Hz
    4. 100 Hz
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  8. Question 8

    Which wave oscillates parallel to the motion of the sound wave?
    1. Electromagnetic wave
    2. Transverse wave
    3. Mechanical wave
    4. Longitudinal wave
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  9. Question 9

    The number of oscillations per second is called ______ of oscillation.
    1. Pitch
    2. Hertz
    3. Frequency
    4. Amplitude
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  10. Question 10

    The loudness of sound is measured in which unit?
    1. Decibel (DB)
    2. Sound intensity
    3. Watt / sq. Metre (w/m²)
    4. Hertz (Hz)
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  11. Question 11

    In which unit, noise pollution is measured?
    1. Centimeter
    2. Ohm
    3. Decibel
    4. Hertz
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  12. Question 12

    The time elapsed between viewing a lightning flash and hearing the thunder of a cloud is 10 s. If the speeds of sound and light in air are 330 m/s and 3×10⁸ m/s respectively, how far away is the storm?
    1. About 1650 m
    2. About 3300 m
    3. About 990 m
    4. About 1000 m
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  13. Question 13

    A sound wave of frequency of 2 kHz has a wavelength of 35 cm in a given medium. How long will it take to travel a distance of 2.1 km through the medium?
    1. 30 s
    2. 2.1 s
    3. 3.0 s
    4. 4.1 s
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  14. Question 14

    Which one of the following is the audible range of hearing for humans?
    1. 20 Hz – 20 kHz
    2. 20 kHz – 200 kHz
    3. 20 Hz – 35 kHz
    4. 20 Hz – 40 kHz
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  15. Question 15

    Which one of the following does not apply to sound waves in fluids?
    1. They travel faster in liquids than in gases
    2. They are transverse
    3. They transport energy
    4. They need a medium to travel
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  16. Question 16

    The pitch of a sound wave depends upon which one of its following characteristics?
    1. Speed
    2. Amplitude
    3. Frequency
    4. Loudness
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  17. Question 17

    A person burned a firecracker in front of a cliff and heard its echo 5s after it burst. The distance of the cliff from the person, if the speed of the sound is 340 m/s, is close to:
    1. 1700 m
    2. 170 m
    3. 85 m
    4. 850 m
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  18. Question 18

    Sound and light waves are:
    1. respectively longitudinal and transverse in air
    2. respectively transverse and longitudinal in air
    3. both longitudinal in air
    4. both transverse in air
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  19. Question 19

    Sonic boom is produced when a source of sound travels at a speed:
    1. greater than the speed of light.
    2. greater than the speed of sound.
    3. lesser than the speed of sound.
    4. equal to the speed of sound.
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  20. Question 20

    In which of the following media is the speed of sound the maximum?
    1. Glass
    2. Oxygen
    3. Stainless steel
    4. Water
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