Hydroscope is an instrument that shows changes in:
A). Sound under water
B). Atmospheric humidity
C). Density of liquid
D). None of these
None of these
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.
1. Reflection from a smooth surface like that of a mirror is called ___________ reflection.
2. Which of the following produces more severe burns ?
4. ?An instrument used to measure?humidity is
6. The sky appears blue because of
7. Which one of the following is a good electrical conductor?
8. Why do birds not have respiratory trouble at the time of flying at high altitude ?