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PHYSICS

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

Ultrasonics
Infrasonics
Audible sounds
Megasonics

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

Mercury
Silver
Silver nitrate
Red oxide

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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
Refraction
Diffraction
Reflection

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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

Reflect back the heat given by earth
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

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