Physics
A gap is left between two rails of a railway track to accommodate...... of the metal.

Areal expansion
Apparent expansion
Linear expansion
Volume expansion

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

It is the balance between incoming and outgoing radiation
It is the radiation from the earth in the form of long waves.
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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