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Biochemical Engineering
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Water Treatment
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Question
According to BIS the maximum permissible limit of dissolved solids in drinking water is
Options
A. 1000 mg/l
B. 500 mg/l
C. 2000 mg/l
D. 1500 mg/l
Correct Answer
2000 mg/l
Water Treatment problems
Search Results
1. Conventional tertiary treatment is
Options
A. chemical coagulation and flocculation
B. filtration
C. sedimentation
D. none of these
Show Answer
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Discuss
Correct Answer: chemical coagulation and flocculation
2. Both temporary and permanent hardness of water can be removed on boiling water with
Options
A. calcium hydroxide
B. sodium carbonate
C. calcium oxide
D. calcium carbonate
Show Answer
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Discuss
Correct Answer: sodium carbonate
3. The water being used in dairy industry should contain not more than
Options
A. 5 proteolytic and/or lipolytic organisms per ml
B. 10 proteolytic and/or lipolytic organisms per ml
C. 15 proteolytic and/or lipolytic organisms per ml
D. 20 proteolytic and/or lipolytic organisms/ml
Show Answer
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Correct Answer: 5 proteolytic and/or lipolytic organisms per ml
4. Zeolite softening process removes
Options
A. only temporary hardness of water
B. only permanent hardness of water
C. both temporary and permanent hardness of water
D. the dissolved gases in permanent hard water
Show Answer
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Discuss
Correct Answer: both temporary and permanent hardness of water
5. Which of the following chemical is sometime added in the process of coagulation and flocculation?
Options
A. Aluminum sulphate
B. Aluminum oxide
C. Calcium chloride
D. None of these
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Correct Answer: Aluminum sulphate
6. Permanent hardness of water is caused by the presence of
Options
A. bicarbonates of calcium and magnesium
B. carbonates of sodium and potassium
C. chlorides and sulfates of calcium and magnesium
D. phosphates of sodium and potassium
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Correct Answer: chlorides and sulfates of calcium and magnesium
7. The purest form of naturally occurring water is
Options
A. rain water
B. river water
C. pond water
D. well water
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Correct Answer: rain water
8. The maximum desirable limit (BIS) of total hardness (as CaCo
3
) in drinking water is
Options
A. 600 ppm
B. 300 ppm
C. 500 ppm
D. 1000 ppm
Show Answer
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Correct Answer: 300 ppm
9. Acid used mostly for removal of milk stone is
Options
A. phosphoric acid
B. nitric acid
C. gluconic acid
D. tartaric acid
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Correct Answer: nitric acid
10. Lagoons may be characterized as
Options
A. anaerobic
B. facultative
C. aerated
D. all of these
Show Answer
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Discuss
Correct Answer: all of these
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