Physics
The laws which govern the motion of planets are called ________

De Morgan's Laws
Kepler's Laws
Avogadro's laws
Newton's Laws

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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 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

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Physics
A hydrogen balloon floats up because of

Air pressure decreases with decrease in weight
Air pressure decreases with decrease in height
The pressure inside the balloon is more than the pressure outside it
Weight of the balloon is less than the weight of air displaced by it.

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