Physics
Propagation of sound can be visualised as propagation of ________ variations in the medium

Viscosity
Porosity
Density
Elasticity

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Physics
Which of the following events occurred first ?

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

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