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

The speed of all gas molecules is same
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

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Physics
The blue colour of water in the sea is due to

Scattering of blue light by water molecules
Reflection of blue sky by sea water
Reflection of blue light by impurities in sea water
Absorption of other colours except blue by water molecules

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Physics
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

plastics have a higher thermal conductivity than metals
metals are good conductor of heat
plastics have a lower density than metals
metals have higher thermal capacity than plastics

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