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Physics

Physics
The instrument used to measure the speed of the wind is

Dosimeter
Altimeter
Anemometer
Chronometer

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Physics
A barometer is kept inside a bell jar. Air is slowly pumped out of the jar.

The bell jar breaks up
The mercury level starts rising
The mercury level starts falling
The mercury level does not change

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Physics
Parabolic mirrors are used in

Dentists mirros
Car headlights
Shaving mirros
Driving mirrors

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Physics
Least audible sound for most of the human ear is :

0.005 µ bar
5.0 µ bar
0.0002 µ bar
10.0 µ bar

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Physics
Noise is measured in

Watt
Decibel
REM
Centigrade

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Physics
Stars appears to move from east to west because

The earth rotates from east to west
The earth rotates from west to east
The background of the stars moves from west to east
All stars move from east to west

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