Q. Chlorofluorocarbon are nonflammable chemicals mainly used in _________. Perfumes Refrigerators Air conditioners All of the above Answer: All of the above.
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Q. Which of the following salts is the main cause of permanent hardness of water? Magnesium sulphate Magnesium bicarbonate Magnesium carbonate None of the above Answer: Magnesium sulphate.
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Q. Which of the following techniques is used for reducing the total dissolved solids (TDS) in the water? Osmosis Ion exchange Distillation Both 2 and 3 Answer: Both 2 and 3.
Q. Which of the following statements are true about CNG -Compressed natural gas? It is a clean fuel It is a harmful fuel It is a polluting fuel All of the above Answer: It is a clean fuel.
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Q. Which of the following rivers is called the world’s most polluted river? Ganga River Chenab River Cauvery River Yamuna River Answer: Ganga River.
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Q. Which of the following are the primary causes of water pollution? Plants Animals Human activities None of these Answer: Human activities.
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Q. The following cause alkalinity as well hardness in natural water. Calcium carbonate Calcium bicarbonate Magnesium carbonate All of the above Answer: All of the above
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Q. Step of sewage water treatment in which sewage is placed in tanks and aerated with large blowers is called Activated sludge treatment Chlorination Secondary sewage treatment Primary sewage treatment Answer: Activated sludge treatment
Q. What is fourth step of raw water treatment? Sedimentation Coagulation Chlorination Filtration Answer: Chlorination
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Q. The Total dissolved solids (TDS) can be reduced by the following method Distillation Reverse osmosis Ion exchange All of the above Answer: All of the above
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