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

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

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Physics
Which of the following is not a property of heavy water ?

It produces corrosion
Freezing point of heavy water is higher than that of ordinary water
Boiling point of heavy water is lower than that or ordinary water
Density of heavy water is higher than that of ordinary water

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