Discussion
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- Question
Acid used mostly for removal of milk stone is
Options- A. phosphoric acid
- B. nitric acid
- C. gluconic acid
- D. tartaric acid
- Correct Answer
- nitric acid
- 1. 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
- 2. The purest form of naturally occurring water is
Options- A. rain water
- B. river water
- C. pond water
- D. well water Discuss
- 3. 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
- 4. 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
- 5. Conventional tertiary treatment is
Options- A. chemical coagulation and flocculation
- B. filtration
- C. sedimentation
- D. none of these Discuss
- 6. Lagoons may be characterized as
Options- A. anaerobic
- B. facultative
- C. aerated
- D. all of these Discuss
- 7. 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 Discuss
- 8. 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 Discuss
- 9. 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 Discuss
- 10. Both temporary and permanent hardness of water can be removed by
Options- A. boiling
- B. distillation
- C. filtration
- D. decantation Discuss
Water Treatment problems
Search Results
Correct Answer: 300 ppm
Correct Answer: rain water
Correct Answer: chlorides and sulfates of calcium and magnesium
Correct Answer: 2000 mg/l
Correct Answer: chemical coagulation and flocculation
Correct Answer: all of these
Correct Answer: 0.001 mg/l
Correct Answer: to prevent corrosion
Correct Answer: increase the percentage of gram(-)ve rods on utensils
Correct Answer: distillation
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