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

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

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Physics
Planets do not twinkle because

They are nearer to earth and hence we receive a greater amount of light.
They are very far away from the earth resulting in decrease in intensity of light
Their distance from the earth does not change with time
They emit light of a constant intensity

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Physics
A white and smooth surface is

Bad absorber and good reflector of heat
Bad absorber and bad reflector of heat
Good absorber and good reflector of heat
Good absorber and bad reflector of heat

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