Physics
A small drop of oil spreads over water because :

Water has a higher viscosity
Water has a higher surface tension
Oil has a higher surface tension
Oil has a higher viscosity

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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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