Physics
Mirage is due to:

Unequal heating of different parts of the atmosphere
Depletion of ozone layer in the atmosphere
Equal heating of different parts of the atmosphere
Magnetic disturbances in the atmosphere

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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 potential energy of the gas molecules is zero
The kinetic energies of all gas molecules are not same

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