Physics
A vacuum cleaner works on the principle of pressure difference. On the moon it will

Not work at all
Work as efficiently as on the earth
Work with reduced efficiency
Work with increased efficiency

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

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

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