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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Physics
In the process of magnetisation of a bar

Only some parts of the outer layers of the bar get magnetised
Only the ends of the bar get magnetised
Only the surface of the bar gets magnetised
The entire bulk of the bar gets magnetised

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