Physics
Which of the following events occurred first ?

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

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Physics
It is easier for a man to swim in sea water, than in river water because

The sea is-deeper than the river
The density of sea water is more than the density of river water
The sea is wider than the river
The density of sea water is lesser than the density of river water

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