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
Shifed neither upward nor downward
Shifted upwards

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Steel can be saved
Accidents due to expansion in summer can be avoided
Accidents due to contraction in winter can be avoided
Air-gaps are necessary for bearing the weight of running train

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