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Q. Which one of the following explains that all the galaxies are receding from us
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Q. The energy stored in a watch spring is
Q. Which of the following type of mirror is used in the head lights of vehicles
Q. The reflector of a search light is a :
Q. The power of a lens is measured in:
Q. Water cannot be used to extinguish fire caused by electric current, because
Q. Instrument used to measure the force and velocity of the wind is
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