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Environmental Engineering - Interview Questions and Answers

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111. The maximum permissible limit for flouride in drinking water is
A. 0.1 mg/litre
B. 1.5 mg/litre
C. 5 mg/litre
D. 10 mg/litre
Explanation:
112. Which of the following compounds is widely used for algae control ?
A. sodium sulphate
B. copper sulphate
C. sodium chloride
D. calcium chloride
Explanation:
113. The commonly used material for water supply pipes, which has the properties of being strong, not easily corroded and long life but is heavy and brittle is
A. steel
B. cast iron
C. copper
D. reinforced cement concrete
Explanation:
114. Double filtration is used
A. to increase the filtration slow sand filters capacity of
B. to increase the filtration rapid sand filters capacity of
C. for isolated buildings like pools, hotels etc swimming
D. all of the above
Explanation:
115. In lime-soda process
A. only carbonate hardness is removed
B. only non-carbonate hardness is re-moved
C. lime reduces the carbonate hardness and soda-ash removes the non-carbo�nate hardness
D. lime reduces the non-carbonate hard-ness and soda-ash removes the carbo�nate hardness
Explanation:
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