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Q. The device used to convert solar energy into electricity is
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Q. Which of the following represents a relation for ''heat lost = heat gained'?
Q. Sound is heard over longer distances on rainy days because
Q. The swing of a spinning cricket ball in the air can be explained on the basis of
Q. Persons suffering from myopia are advised to use
Q. Which of the following is the correct device for the detection of thermal radiation?
Q. Mach number is used in connection with the speed of
Q. Which one of the following laser types is used in a laser printer?
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