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

sand is soft and concreter is hard.
the friction between sand and feet is more than that between concrete and feet.
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
For an ideal gas, which one of the following statements does not hold true?

There is no interactive force between the molecules.
The speed of all gas molecules is same
The kinetic energies of all gas molecules are not same
The potential energy of the gas molecules is zero

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