Physics
The rice is cooked more quickly in a pressure cooker because

It is covered.
Less quantity of water is used.
Water boils at a higher temperature under pressure.
None of these

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Physics
For an ideal gas, which one of the following statements does not hold true?

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

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