1. Ozone depletion is caused by the increase in the level of A. Water vapour B. Chlorofluro carbon (CFC) C. Oxygen D. Carbon monoxide Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
2. Which of the following is a beneficial activity of microorganisms? A. Some microorganisms use carbon dioxide B. Some microorganisms provide nitrogen for plant growth C. Some microorganisms are used in sewage treatment D. All the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
3. Which of the following parameters indicates the organic pollution of a water sample? A. pH B. Turbidity C. Hardness D. COD Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
4. The chemical system for removal of the ions of level of salt is called A. Ion transfer B. Ionization C. Ion exchange D. Ion vaporization Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
5. The atmosphere is divided in four layers. The layer in contact with the surface of earth called A. Stratosphere B. Troposphere C. Mesosphere D. Ionosphere Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
6. Which of the following layers of earth have the composition of peridotite? A. Upper mantle B. Inner core C. Outer core D. Continental Crust Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
7. The flow in natural streams is almost always turbulent and may be assumed to be incompressible, consequently the applicable equations of motion for the fluid are the A. Bed - load equation B. Reynolds equation C. Lane's model D. Lacey's equation Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
8. The antifreeze molecules that prevent intracellular ice formation in marine organisms are generally A. Calcium salts B. Glycoproteins C. Membrane phospholipids D. Long chain alcohols Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
9. Chlorination is process of A. Sewage treatment B. Water purification C. Bacteriophage analysis of water D. None of these Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
10. Dead zones in oceans refers to A. Mariana trench, the deepest part of the ocean where living organisms have not been found B. Hydrothermal vents that have extreme temperatures C. Neritic zone at extreme end of continental shelf that is devoid of sunlight D. Oceanic regions that are extremely hypoxic due to substantial eutrophication Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
