Physics
A piece of ice is floating in water kept in a beaker. When all the ice melts the level of water will

Rise
First rise and then fall
Fall
Remain the same

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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 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
Steel can be saved

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Physics
It is easier to roll a barrel full of coal tar than to pull it because

more surface area of the barrel is in contact with the road when it is pulled
coal tar is a liquid and it flows in the barrel when it is rolled
the rolling friction is much less than the sliding friction
the full weight of the barrel comes into play when it is pulled

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