Physics
When a bullet is fired from a gun

The gun recoils with the same momentum as the bullet
The gun moves forward
The gun does not move
The gun jumps up

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Physics
A hydrogen balloon floats up because of

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

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