Physics
If an empty cylinder is half filled with a liquid, its center of gravity is

Shifted downwards
Shifted upward or downward depending on the density of the liquid
Shifed neither upward nor downward
Shifted upwards

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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

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

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Physics
A standing wave occurs when

Two waves overlap
A wave reflects upon itself
The speed of the wave is zero or near zero
The amplitude of a wave exceeds its wavelength

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