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Q. X - rays are used for the study of crystal structure because
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Q. Why does the sea appear blue in colour?
Q. Materials for rain-proof coats and tents owe their water proof properties to
Q. Which of the following never occurs singly in nature?
Q. Which of the following properties is found only in ferromagnetic materials ?
Q. The characteristic invalid for heat radiation is that it travels :
Q. Two bulbs of 100W and 60W are operating on 220 V line. The ratio of their resistance is
Q. The device which converts sound energy into electrical energy is called
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