Physics
After long periods of use, a grey spot develops on the inside of a bulb. This is because

Dust inside the bulb condenses on the top
Glass undergoes a change due to the heat
The tungsten filament evaporates and collects there
The heat of the bulb scorches the glass at the top

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Physics
Which of the following events occurred first ?

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

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