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Physics

Physics
In mirrors the back surface is coated with a thin layer of :

Silver
Mercury
Red oxide
Silver nitrate

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Physics
In a Cinema hall, the distance between the projector and the screen is increased by 2%. Then the intensity of illumination on the screen is

Decreased by 4%
Decreased by 2%
Increased by 2%
Increased by 4%

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Physics
Stars appears to move from east to west because

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

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Physics
Which is best used as a sound absorbing material in partition walls ?

Glass - wool
Steel
Stone chips
Glass pieces

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Physics
A television channel is characterised by

Size of picture tube
Physical dimension of television screen
Velocity of transmitted signal
Frequency of transmitted signal

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Physics
Which law is also called law of inertia ?

All of above
Newton second law
Newton first law
Newton third law

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