Physics
A Fuse wire is characterised by

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

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Physics
Rainbow is due to

refraction and reflection of sunlight by water droplets
diffusion of sunlight through water droplets
absorption of sunlight in minute water droplets
ionisation of water deposits

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

The person can sit on it like a raft
It provides oxygen to a drowning person
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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