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Physics

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

Water
Soil
Glass
Plastic

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

Mercury
Red oxide
Silver
Silver nitrate

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Physics
Which has the lowest albedo?

Both A & B
Light surfaces
Dark surfaces
None of these

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Physics
Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in

42 seconds
42 years
4.2 years
4.2 seconds

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Physics
The least penetrating power ray is

Beta rays
None of these
Alpha rays
Gamma rays

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Physics
One light year is equal to

6 trillion miles
9 trillion miles
8 trillion miles
2 trillion miles

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