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  1. The unit of noise pollution (level) is :

    2. A.

     Decibel
    B.

     Decimal
    C.

     Ppm
    D.

     None of these

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  2. The speed of sound travel fastest through

    3. A.

     Liquid
    B.

     Solid
    C.

     Gas
    D.

     None of the above

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  3. Compressions and Rarefactions are characteristic of

    4. A.

     Longitudinal waves
    B.

     Transverse waves
    C.

     Both A & B
    D.

     Neither of A & B

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  4. Least audible sound for most of the human ear is :

    5. A.

     10.0 µ bar
    B.

     0.0002 µ bar
    C.

     0.005 µ bar
    D.

     5.0 µ bar

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  5. Hertz is a unit for measuring

    6. A.

     Intensity of waves
    B.

     Frequency of waves
    C.

     Wavelength
    D.

     Clarity of waves

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  6. Hertz is the SI unit of

    7. A.

     Weight
    B.

     Power
    C.

     Pressure
    D.

     Frequency

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  7. The velocity of the sound is highest in

    8. A.

     Metal
    B.

     Air
    C.

     Water
    D.

     Vacuum

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  8. The ordinary and maximum tolerance limit of sound by human being is

    9. A.

     50 db to 70 db (decibel)
    B.

     60 db to 80 db (decibel)
    C.

     65 db to 75 db (decibel)
    D.

     70 db to 85 db (decibel)

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  9. In SONAR which kind of wave is used?

    10. A.

     Infrasonic
    B.

     Ultrasonic
    C.

     Radio
    D.

     Audible sound

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  10. Sound waves cannot travel through

    11. A.

     Gas
    B.

     Liquid
    C.

     Vacuum
    D.

     Solid

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