Physics
The wave of theory of light is based on

The laws of reflection
Huyghens' principle
The inverse square law
The laws of refraction

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

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Accidents due to contraction in winter can be avoided
Air-gaps are necessary for bearing the weight of running train
Steel can be saved
Accidents due to expansion in summer can be avoided

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