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 ?

Both the spheres will reach the ground simultaneously.
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.

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Physics
The blue colour of water in the sea is due to

Absorption of other colours except blue by water molecules
Reflection of blue sky by sea water
Scattering of blue light by water molecules
Reflection of blue light by impurities in sea water

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