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

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

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Physics
Rainbow is due to

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

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Physics
Stationary wave is formed by

Two waves of same frequency travelling in the same direction
Two waves of same frequency travelling in the opposite direction
Two waves of the same speed superposing
A transverse wave superposing a longitudinal wave

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