Physics
When a bottle of perfume is opened in one corner of a room the smell spreads soon throughout the room. This is an example of

Diffusion
Viscosity
Surface tension
Capillarity

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Physics
Which of the following occurred first ?

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

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