Water Treatment problems
- 1. 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 Discuss
Correct Answer: both temporary and permanent hardness of water
- 2. 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 Discuss
Correct Answer: 5 proteolytic and/or lipolytic organisms per ml
- 3. 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 Discuss
Correct Answer: sodium carbonate
- 4. Conventional tertiary treatment is
Options- A. chemical coagulation and flocculation
- B. filtration
- C. sedimentation
- D. none of these Discuss
Correct Answer: chemical coagulation and flocculation
- 5. 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 Discuss
Correct Answer: 2000 mg/l
- 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 Discuss
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 Discuss
Correct Answer: rain water
- 8. The maximum desirable limit (BIS) of total hardness (as CaCo3) in drinking water is
Options- A. 600 ppm
- B. 300 ppm
- C. 500 ppm
- D. 1000 ppm Discuss
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 Discuss
Correct Answer: nitric acid
- 10. Lagoons may be characterized as
Options- A. anaerobic
- B. facultative
- C. aerated
- D. all of these Discuss
Correct Answer: all of these
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