Physics
If an empty cylinder is half filled with a liquid, its center of gravity is

Shifted downwards
Shifted upward or downward depending on the density of the liquid
Shifed neither upward nor downward
Shifted upwards

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

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

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