Physics
In which one of the following the phenomenon of total internal reflection of light is used ?

Formation of mirage
Twinkling of stars
Working of binoculars
Formation of rainbow

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Physics
Which of the following options correctly explains the term heat budget?

It is the radiation from the earth in the form of long waves.
It is the balance between incoming and outgoing radiation
It is the amount of heat which the surface of earth receives from the sun.
It is a mode of transfer of heat through matter by molecular activity.

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Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

Both silver and gold pieces weigh equal
Weighing will depend on their masses
The gold piece will weigh more
The silver piece will weigh more

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Physics
The velocity of sound in air

Increases with decrease of temperature
Decreases with decrease of temperature
Does not depend on temperature
Decreases with increase of temperature

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