Physics
A dynamo is a device which

Converts electrical energy into mechanical energy
Creates electrical energy
Creates mechanical energy
Converts mechanical energy into electrical energy

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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 a mode of transfer of heat through matter by molecular activity.
It is the radiation from the earth in the form of long waves.

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