Physics
When a steel ball is placed on the surface of mercury, it does not sink because

Of the surface tension of mercury
The density of mercury is greater than that of steel
Mercury is a semisolid
Of the high viscosity of mercury

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Physics
We always see the same face of the moon, because

It revolves on its axis in adirection opposite to that ofthe earth
It is smaller than the earth
It rotates at the same speed as the earth around the sun
It takes equal time for revolution around the earth and rotation on its own axis

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

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

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