Physics
Echolocation is an adaptation bats use to

Locate flowering plants
Find warm places for hibernation
All of these
Hunt insects in flight

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Physics
Rainbow is due to

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

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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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