The first large scale electrical air conditioning was invented and used in 1902 by
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Red Data Book provides an account of
Depletion of ozone layer causes
Which of the following is natural fiber?
Which of the following is not a fundamental duty?
______________ means that the Supreme Court will reconsider the case and the legal issues involved in it.
Addition of suitable impurities into semiconductor, is called
As per Newton's law of gravitation, the force between two bodies is ________.