Physics
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

Below a certain minimum value irrespective of amount of water in the pail
Below a certain minimum value depending on amount of water in the pail
Above a certain minimum value depending on amount of water in the pail
Above a certain minimum value irrespective of amount of water in the pail

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Physics
Stationary wave is formed by

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

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Physics
'Mirage' is an example of

Total internal reflection of light only
Refraction of light only
Dispersion of light only
Refraction and total internal reflection of light

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