Physics
A stone is dropped from the roof of a house towards the ground. The kinetic energy of the stone will be maximum:

When it touches the ground
Just after it is dropped
Just before it touches the ground
When it is just on the half-way

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Physics
A hydrogen balloon floats up because of

Air pressure decreases with decrease in height
Air pressure decreases with decrease in weight
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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