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Physics

Physics
Which of the following cannot be used for making lenses?

Water
Glass
Plastic
Soil

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Physics
Which of the following criterion is used for any metal to be used as a cooking material ?

More thermal conductivity
More specific heat
Less electrical conductivity
Less thermal conductivity

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

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

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Physics
A hunter on the ground wishes to shoot a bird on a tree at a distance with his rifle. He has to point the rifle

In the same direction as the bird
At a higher elevation than the bird
At the lower elevation than the bird
Vertically upwards

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

Glass pieces
Steel
Glass - wool
Stone chips

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Physics
Hot water is poured simultaneously in four metallic tumblers painted outside with different paints. After some time the water will be found to have cooled most in the tumbler painted.

Shining black
Rough black
Shining white
Rough white

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