Physics
Bubbles of air rise up through liquids due to

Viscosity and buoyancy
Up thrust and surface tension
Air current over the liquid and buoyancy
Surface tension and adherence

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

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
A transverse wave superposing a longitudinal wave

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