Physics
Ozone layer above the surface of Earth provides a shield against

Gamma rays
Infra-red rays
X-rays
Ultra-violet rays

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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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