Basic General Knowledge
Super conductivity is a phenomenon in which the resistance of a substance

does not change with temperature
becomes zero at very low temperature
increases with temperature
decreases with temperature

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Basic General Knowledge
Primary rainbow is formed when light suffers

no internal refraction
either one or two internal refractions before emerging out of the drop
two internal refractions before emerging out of the drop
one internal refractions before emerging out of the drop

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