Practice test

Sound and acoustics - Test Set 5

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

    In which one among the following mediums would the speed of sound be maximum?
    1. Distilled water
    2. Methanol
    3. Drinking water
    4. Sea water
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  2. Question 2

    A sound wave having frequency of 300 Hz is travelling in an unknown medium. Its wavelength is not known. It travels a distance equal to 150 times its wavelength in time t. The value of t is:
    1. 0.5 s
    2. 1 s
    3. 1.5 s
    4. 2 s
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  3. Question 3

    Which one among the following statements regarding sound is correct?
    1. High pitch sound has high amplitude
    2. High pitch sound has high frequency
    3. High pitch sound has high speed
    4. High pitch sound has low frequency and high amplitude
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  4. Question 4

    Infrasonic sounds have frequencies:
    1. above 25 kHz
    2. between 20 kHz and 25 kHz
    3. below 20 Hz
    4. between 20 Hz and 20 kHz
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  5. Question 5

    A sound wave consists of:
    1. a number of rarefaction pulses one after the other.
    2. a compression pulse and a rarefaction pulse separated by a distance of one wavelength.
    3. a number of compression pulses one after the other.
    4. compression and rarefaction pulses one after the other.
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  6. Question 6

    The sound created in a big hall persists because of the repeated reflections. The phenomenon is called:
    1. Reverberation
    2. Dispersion
    3. Refraction
    4. Diffraction
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  7. Question 7

    'Beats' is a phenomenon that occurs when frequencies of two harmonic waves are:
    1. equal
    2. nearly same
    3. far apart
    4. multiples of each other
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  8. Question 8

    Which among the following is true for propagation of sound waves?
    1. Sound can travel in vacuum and it is a longitudinal wave in air.
    2. Sound can travel in vacuum and it is a transverse wave in air.
    3. Sound cannot travel in vacuum and it is a longitudinal wave in air.
    4. Sound cannot travel in vacuum and it is a transverse wave in air.
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  9. Question 9

    Reverberation is a phenomenon associated with a:
    1. single refraction of sound
    2. multiple refraction of sound
    3. single reflection of sound
    4. multiple reflection of sound
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  10. Question 10

    The unit of the ratio between thrust and impulse is same as that of:
    1. frequency
    2. speed
    3. wavelength
    4. acceleration
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  11. Question 11

    Which one of the following statements is true for sound waves propagating in air?
    1. Sound is an electromagnetic wave and transverse in nature.
    2. Sound is a mechanical wave and longitudinal in nature.
    3. Sound is a mechanical wave and transverse in nature.
    4. Sound is an electromagnetic wave and longitudinal in nature.
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  12. Question 12

    SONAR is a device that is used to measure the distance of underwater objects by a ship. Which of the following types of waves does it use for this purpose?
    1. Infrasonic waves
    2. Sound waves in audible range for human beings
    3. Ultrasonic waves
    4. All of the above
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  13. Question 13

    The velocity of sound in moist air is more than in dry air because the moist air has –
    1. Less pressure than dry air
    2. More density than dry air
    3. More pressure than dry air
    4. Less density than dry air
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  14. Question 14

    Hertz is the unit of______________.
    1. Frequency
    2. Wavelength
    3. Intensity
    4. Clarity of waves
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  15. Question 15

    The Unit of noise pollution (level) is–
    1. Decimal
    2. Decibel
    3. Ppm
    4. None of the above
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  16. Question 16

    What is Decibel?
    1. A musical instrument
    2. Wavelength of noise
    3. Scale of sound level
    4. A musical note
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  17. Question 17

    The Permissible noise level at residential area during day time is_______.
    1. 45 dB
    2. 80 dB
    3. 75 dB
    4. 55 dB
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  18. Question 18

    The range of frequency of ultrasonic wave.
    1. Greater than 20 KHz
    2. Greater than 20,000 KHz
    3. Below than 20 KHz
    4. Greater than 02 KHz
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  19. Question 19

    In which of the following frequency Range, Human ear feels the sensitivity of vibration of sound?
    1. 0 – 5 Hz
    2. 20 – 20,000 Hz
    3. 6 – 10 Hz
    4. 11 – 15 Hz
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  20. Question 20

    If the ratio of intensity of wave is 25:9. What is the ratio of their amplitude?
    1. 50 : 18
    2. 25 : 9
    3. 5 : 3
    4. 3 : 5
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