Physics
For every action, there is an equal and opposite reaction, is Newton's

First law
Third law
Fourth law
Second law

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Physics
A drop of liquid assumes spherical shape because:

A sphere has the least surface area for a given volume
Intermolecular forces are strong in liquids
A sphere has the largest surface area for a given volume
Inter molecular forces are weak in liquids

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

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