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.
A will reach the ground first.
B will reach the ground first.
Both the spheres will reach the ground simultaneously.

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Physics
A hydrogen balloon floats up because of

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.
Air pressure decreases with decrease in height

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