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

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

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Physics
A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct ?

The question is incomplete because the masses of the spheres are not given.
B will reach the ground first.
A will reach the ground first.
Both the spheres will reach the ground simultaneously.

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Physics
The sensation of weightlessness in a spacecraft in an orbit is due to the

Fact that spacecraft in the orbit has no energy
Acceleration in the orbit which is equal to the acceleration due to gravity outside
Absence of gravity outside
Presence of gravity outside but not inside the spacecraft

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