Physics
A solid needle placed horizontally on the surface of the water floats due to

Water pressure
Capillary action
Surface tension of water
Viscosity of water

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Physics
Rainbows are produced when sunlight :

None of the given statements is correct.
Incident on raindrops hanging in the atmosphere is dispresed after suffering reflection.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.

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

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