Hydroscope is an instrument that shows changes in:

1.	Hydroscope is an instrument that shows changes in:
Answer» <html><body><p> None of these</p><br/><br/><p>Hydroscope is an optical device for enabling a person to see an object at a <a href="https://interviewquestions.tuteehub.com/tag/considerable-929884" style="font-weight:bold;" target="_blank" title="Click to know more about CONSIDERABLE">CONSIDERABLE</a> distance below the <a href="https://interviewquestions.tuteehub.com/tag/surface-1235573" style="font-weight:bold;" target="_blank" title="Click to know more about SURFACE">SURFACE</a> of water by <a href="https://interviewquestions.tuteehub.com/tag/means-1091780" style="font-weight:bold;" target="_blank" title="Click to know more about MEANS">MEANS</a> 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 <a href="https://interviewquestions.tuteehub.com/tag/converted-2543437" style="font-weight:bold;" target="_blank" title="Click to know more about CONVERTED">CONVERTED</a> to sound pressure level (SPL), a logarithmic measure of the mean square acoustic pressure.</p></body></html>

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