Which of the following is the cleanest source of energy?
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Bulb is a modification of which part of a plant?
In 1981, ISRO launched India's first geostationary satellite called -
A famous Shiva temple, Pashupatinath is in
Who has been appointed as the Secretary General of the United Nations in January, 2017?
Black soil is also known by which of the following name ?
Insulators have resistivity of the order of
A curved mirror where the reflecting surface is curved inwards is called a