Physics
Which of the following occurred first ?

Albert Einstein propounded the General Theory of Relativity
Guglielmo Marconi sent out the first wireless signals
Wright Brothers successfully flew an aircraft
Max Planck unveiled the Quantum Theory

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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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