Which is the highest quality of hard coal?
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Which of the following is not a commercial source of energy?
Which one of the following bio reserves of India is not included in the World Network of Biosphere Reserve?
What is the source of natural energy of the hot springs at Manikaran in Himachal Pradesh ?
______ is the time taken by the earth to return to a given point in its orbit with reference to a fixed star.
What is the mean temperature of Earth?
Venus is the _______ planet from the Sun.
Which of the following is man-made fibre?
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