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

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

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Physics
Which of the following events occurred first ?

Max Planck unveiled the Quantum Theory
Madame Marie Curie became the first woman Nobel Prize winner
Marconi first tranmitted a wireless signal
Albert Einstein propounded the General Theory of Relativity

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