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Biochemical Engineering
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Water Treatment
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Question
The maximum desirable limit (BIS of mercury in the drinking water is
Options
A. 0.05 mg/l
B. 0.9 mg/l
C. 0.1 mg/l
D. 0.001 mg/l
Correct Answer
0.001 mg/l
Water Treatment problems
Search Results
1. 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
2. Acid used mostly for removal of milk stone is
Options
A. phosphoric acid
B. nitric acid
C. gluconic acid
D. tartaric acid
Show Answer
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Discuss
Correct Answer: nitric acid
3. 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
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Discuss
Correct Answer: 300 ppm
4. 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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Discuss
Correct Answer: rain water
5. 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
6. Inhibitors are used along with sanitizer to
Options
A. improve their action
B. to prevent corrosion
C. both (a) and (b)
D. none of these
Show Answer
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Correct Answer: to prevent corrosion
7. Application of quaternary ammonium compounds as sanitizing agents tends to
Options
A. favor gram positive bacteria
B. decrease gram positive bacteria
C. increase the percentage of gram(-)ve rods on utensils
D. none of the above
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Correct Answer: increase the percentage of gram(-)ve rods on utensils
8. Both temporary and permanent hardness of water can be removed by
Options
A. boiling
B. distillation
C. filtration
D. decantation
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Correct Answer: distillation
9. Permanent hardness of water may be removed by the addition of
Options
A. lime
B. soda ash
C. potassium permagnate
D. sodium bicarbonate
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Correct Answer: soda ash
10. The common methods used for disinfection in waste water treatment plants are
Options
A. chlorination
B. UV light
C. both (a) and (b)
D. Phenolic solvent
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Correct Answer: both (a) and (b)
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Enzymes and Kinetics
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Water Treatment