Practice test

Sound and acoustics - Test Set 3

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

    Noise pollution is created if noise is in excess to
    1. 70-75 dB
    2. 50-60 dB
    3. 80-99 dB
    4. 40-65 dB
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  2. Question 2

    Speed of sound is the maximum in –
    1. vacuum
    2. gases
    3. liquids
    4. solids
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  3. Question 3

    In which medium the speed of sound is maximum at a temperature around 20°C?
    1. Air
    2. Granite
    3. Water
    4. Iron
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  4. Question 4

    Sound waves
    1. Can travel both in solid and gaseous medium
    2. Can travel only in gas
    3. Can travel only in solid
    4. Can travel in vacuum
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  5. Question 5

    The velocity of sound is maximum in
    1. Air
    2. Liquid
    3. Metal
    4. Vacuum
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  6. Question 6

    Sound waves travel fastest in
    1. Solids
    2. Gases
    3. Liquids
    4. Vacuum
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  7. Question 7

    Sound waves do not travel in
    1. Solids
    2. Liquids
    3. Gases
    4. Vacuum
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  8. Question 8

    To hear a clear echo, the minimum distance between the reflecting surface and the observer should be
    1. 165 feet
    2. 165 metre
    3. 16.5 feet
    4. 16.5 metre
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  9. Question 9

    As per the WHO, the safe noise level for a city is
    1. 45 dB
    2. 50 dB
    3. 55 dB
    4. 60 dB
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  10. Question 10

    A noise level of 100 decibel would correspond to
    1. Just audible sound
    2. Ordinary conversation
    3. Sound from a noisy street
    4. Noise from a machine shop
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  11. Question 11

    What is the decibel level of sound produced by two persons in conversation?
    1. About 5 decibel
    2. About 10 decibel
    3. About 30 decibel
    4. About 100 decibel
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  12. Question 12

    Among the given options, which one causes an echo?
    1. When sound is reflected
    2. When sound waves travel through a vacuum
    3. When sound waves travel through a solid medium
    4. When sound waves travel through a liquid medium
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  13. Question 13

    Among the following, in which material the speed of sound is highest? (at 25°C)
    1. Nickel
    2. Aluminium
    3. Steel
    4. Iron
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  14. Question 14

    Which of the following statements is NOT correct regarding sound?
    1. Unpleasant sounds are called noise
    2. Frequency is expressed in hertz
    3. Sound can travel through vacuum
    4. In human beings, the vibration of vocal cords produce sound
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  15. Question 15

    Loudness of sound is proportional to the ______ of the amplitude of the vibration producing the sound.
    1. Square root
    2. Cube root
    3. Cube
    4. Square
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  16. Question 16

    What is the study of the production and propagation of sound waves called?
    1. Acoustics
    2. Astrophysics
    3. Photonics
    4. Optics
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  17. Question 17

    If an object executes 10 oscillations per second, then its frequency in kilohertz is equal to:
    1. 1
    2. 0.01
    3. 0.1
    4. 10
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  18. Question 18

    Vibration of which among the following produces only odd harmonics?
    1. A vibrating rod fixed at two ends
    2. An air column in an open organ pipe
    3. An air column in a closed organ pipe
    4. A vibrating string fixed at two ends
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  19. Question 19

    What is the approximate speed of sound in distilled water at 25°C (77°F)?
    1. 1598 m/s
    2. 3980 m/s
    3. 1284 m/s
    4. 1498 m/s
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  20. Question 20

    Bats search out prey and fly in dark night by emitting and detecting reflections of which type of Sound waves?
    1. Ultrasonic waves
    2. Subsonic waves
    3. Sonic waves
    4. Hypersonic waves
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