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

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

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Physics
In total internal reflection, the light travel from

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