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

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
It decreases the volume of the person to keep him afloat

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Physics
A Fuse wire is characterised by

High resistance and high melting point
Low resistance and low melting point
Low resistance and high melting point
High resistance and low melting point

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