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PHYSICS

Physics
The sounds having a frequency of 20 Hertz to 20,000 Hertz are known as

Megasonics
Audible sounds
Ultrasonics
Infrasonics

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

Silver
Red oxide
Silver nitrate
Mercury

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Physics
A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers.

Total internal reflection
Reflection
Refraction
Diffraction

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Physics
The snow on the mountains does not melt all at once when it is heated by the sun because:

It becomes very hard
It has a low specific heat capacity
It has a high latent heat of fusion
It reflects most of the heat from the sun

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Physics
Cloudy nights are warmer compared to clear cloudless nights, because clouds mainly

Produce heat and radiate it toward earth
Absorb heat from the atmosphere send it towards earth
Prevent cold waves from the sky descending on earth
Reflect back the heat given by earth

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