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PHYSICS

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

50 db to 70 db (decibel)
70 db to 85 db (decibel)
60 db to 80 db (decibel)
65 db to 75 db (decibel)

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Physics
In SONAR which kind of wave is used?

Ultrasonic
Radio
Infrasonic
Audible sound

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Physics
Sound waves cannot travel through

Liquid
Solid
Vacuum
Gas

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Physics
Noise is measured in

Decibel
Centigrade
Watt
REM

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Physics
Man perceives sound vibrations in the frequency ranges of

11 – 20 Hz
6 – 10 Hz
20 – 20000 Hz
0 – 5 Hz

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