Which type of radiations are absorbed by the upper layer of the atmosphere?
1). Radiowaves
2). Infrared
3). Visible
4). Ultraviolet
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1. What is an exothermic reaction?
2. Which of the following measures will not increase a nation's wealth?
3. Nitrogen forms a variety of compounds in all oxidation states ranging from
4. The Fungus which is used in the alcohol industry is .
5. Which one of the following is extensively used for sterilizing water ?
7. Detergents clean surfaces on the principle of
8. The chemical used for cloud seeding for artificial rains is
9. Which gas is used for converting vegetable oils into saturated fats ?