Physics
Which of the following occurred first ?

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

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Physics
A hydrogen balloon floats up because of

Air pressure decreases with decrease in height
Air pressure decreases with decrease in weight
The pressure inside the balloon is more than the pressure outside it
Weight of the balloon is less than the weight of air displaced by it.

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Physics
'Mirage' is an example of

Refraction and total internal reflection of light
Dispersion of light only
Total internal reflection of light only
Refraction of light only

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