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
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 depending on amount of water in the pail

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Physics
In total internal reflection, the light travel from

Denser to rarer medium and it occurs with loss of intensity
Rarer to denser medium and it occurs with no loss of intensity
Rarer to denser medium and it occurs with loss of intensity
Denser to rarer medium and it occurs with no loss of intensity

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