Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

Weighing will depend on their masses
Both silver and gold pieces weigh equal
The silver piece will weigh more
The gold piece will weigh more

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

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