Physics
Which of the following occurred first ?

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

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Physics
Specific gravity is defined as the ratio of

Density of the substance to the density of water
Density of the substance to the density of water at 4°C
Density of water at 4°C to the density of the substance
Density of the substance to the density of water at 0°C

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