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

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

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Physics
Siphon will fail to work if:

The densities of the liquid in the two vessels are equal.
The level of the liquid in the two vessels are at the same height.
The temperature of the liquids in the two vessels are the same.
Both its limbs are of unequal length.

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Physics
Solids have definite shapes.This is because

The forces of cohesion are very large
The forces of cohesion of the molecules within are very much less in them
The forces of adhesion are large
The forces of adhesion are less

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