Physics
A bird sitting on a high tension electric wire does not get electrocuted because

The body is earthed
It does not form a closed path for the flow of current
Its feet are good insulators
It has high resistance

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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 increases the volume of the person to keep him afloat
It decreases the volume of the person to keep him afloat

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