What is the effeciency of solar cell (Current year)
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Dust is removed from a carpet, if we strike it with a stick, why ?
what is the safest day to have sex with a girl???
What is the difference between Centigrade and Fahrenheit thermometers ?
When water is boiled in a tin and its mouth is closed by a rubber cork, then on pouring cold water over the tin it is crushed. Why ?
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What secondary color of light is produced by mixing the primary colors of red and blue?
What is fluorescence?
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What are the assumptions of quantum theory of black body radiation? : quantum physics
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