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

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

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Physics
Stationary wave is formed by

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

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