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Q. The sparkling of a diamond is due to
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Q. The reverse effect of X-ray emission is
Q. Scalding with steam is more severe than scalding with boiling water because
Q. Red light is used in traffic signals because
Q. Electric current is measured by which instrument?
Q. The S.I. unit of electric charge is :
Q. Water cannot be used to extinguish fire caused by electric current, because
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