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

It is a mode of transfer of heat through matter by molecular activity.
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.

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Physics
Dynamo is a device for converting

Chemical energy into electrical energy
Magnetic energy into electrical energy
Mechanical energy into electrical energy
Heat energy into electrical energy

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