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 a neuron ?

Basic unit of nervous system
Basic unit of energy
The anti-particle of neutron
Particle released during radioactivity

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Physics
Inside an aeroplane, flying at a high altitude,

normal atmospheric pressure is maintained by the use of air pumps.
normal humidity and partial vacuum are maintained.
the pressure is the same as that outside.
the pressure inside is less than the pressure outside.

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