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
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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Q. According to The United States Geological Survey, water having less than 1000 ml/litre of total dissolved solids is Fresh water Slightly saline Moderately saline Brine water Answer: Fresh water
Q. In filtration, the amount of dissolved solids passing through the filters is Difference between total solids and suspended solids Sum of total solids and suspended solids Independent of suspended solids None of the above Answer: Difference between total solids and suspended solids
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Q. Step of sewage water treatment in which there is some aeration and organic material is converted to inorganic materials is called Primary sewage treatment Secondary sewage treatment Activated sludge treatment Chlorination Answer: Secondary sewage treatment
