Physics
It is more difficult to walk on a sandy road than on a concrete road because

the friction between sand and feet is more than that between concrete and feet.
sand is soft and concreter is hard.
the sand is grainy but concrete is smooth.
the friction between sand and feet is less than that between concrete and feet.

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

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 the balance between incoming and outgoing radiation
It is a mode of transfer of heat through matter by molecular activity.

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