Physics
A hydrogen balloon floats up because of

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.
Air pressure decreases with decrease in weight
Air pressure decreases with decrease in height

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Physics
Which of the following events occurred first ?

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

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