Physics
Water pipes in hilly areas often burst on a cold frosty night, because

Frost makes the pipes rusty, so they break
None of these
Water in the pipes freezes and on freezing water expands, so pipes break
The material of which pipes are made contracts due to cold and so breaks

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Physics
Which of the following occurred first ?

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

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