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

It increases the volume of the person to keep him afloat
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

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Physics
It is easier for a man to swim in sea water, than in river water because

The sea is wider than the river
The sea is-deeper than the river
The density of sea water is more than the density of river water
The density of sea water is lesser than the density of river water

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Physics
An egg sinks in soft water but floats in a concentrated solution of salt because

Albumin dissolves in salt solution and egg becomes lighter
Water has high surface tension
Egg absorbs salt from the solution and expands
The density of salt solution exceeds the density of eggs

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