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  1. Hydroscope is an instrument that shows changes in:

    2. A.

     Sound under water
    B.

     Atmospheric humidity
    C.

     Density of liquid
    D.

     None of these

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    Answer : Option D

    Explanation :

    Hydroscope is an optical device for enabling a person to see an object at a considerable distance below the surface of water by means of a series of mirrors enclosed in a steel tube. Hydrophone is an instrument used for recording sound under water. It is the underwater equivalent of a microphone that measures pressure fluctuations, and these are usually converted to sound pressure level (SPL), a logarithmic measure of the mean square acoustic pressure.

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