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Q. Which of the following is always found in a free state in nature?
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Q. In which decade was the telephone invented?
Q. Purification of copper is done by
Q. Optical fibers are mainly used for which of the following?
Q. Who is awarded by Noble prize for the discovery is neutron?
Q. Sun seems red in colour at sunrise & sunset due to
Q. Which instrument measures the intensity of earthquake shocks?
Q. Knot is a unit of speed of which of the following?
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