Physics
Conservation of energy refers to the fact that

The entropy of the universe is always increasing
No chemical reaction is 100 percent efficient
If you conserve energy you will not be as tired
Energy cannot be created or destroyed but can be converted from one form to another

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

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

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Physics
What is the principle of a ''Life Jacket"?

It provides oxygen to a drowning person
The person can sit on it like a raft
It decreases the volume of the person to keep him afloat
It increases the volume of the person to keep him afloat

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