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

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

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Physics
Holography is a technique of

Recording a permanent three dimensional photograph of a given single colour or a multicolour
Recording a permanent three dimensional multicolour photograph
Recording a permanent, sharp two diimensional black and white or multicolour photograph
Recording a permanent three dimensional black and white photograph

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