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Q. The illuminating powers of two sources are compared by
The illuminating powers of two sources are compared by a photometer.
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Q. A rear-view mirror for driving is
Q. Who initially gave the idea of laser (without using the acronym)?
Q. How many millimeters make ten kilometers?
Q. The locomotion of insects to the source of light is called :
Q. Sun appears red in colour at sunrise and sunset due to
Q. Cooking some thing on a hill take long time than in the plain because
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