Discussion
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- Question
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
- Correct Answer
- sodium carbonate
- 1. 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
- 2. 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
- 3. 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 Discuss
- 4. Biological oxidation processes usually referred as biological treatment, are the most common form of
Options- A. primary treatment
- B. secondary treatment
- C. tertiary treatment
- D. all of these Discuss
- 5. Sedimentation is a physical process used in wastewater treatment to
Options- A. remove particles that are less dense than water
- B. remove particles that are more dense than water
- C. remove the pertinacious material from the water
- D. none of the above Discuss
- 6. Conventional tertiary treatment is
Options- A. chemical coagulation and flocculation
- B. filtration
- C. sedimentation
- D. none of these Discuss
- 7. 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
- 8. 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
- 9. The purest form of naturally occurring water is
Options- A. rain water
- B. river water
- C. pond water
- D. well water Discuss
- 10. 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
Water Treatment problems
Search Results
Correct Answer: 5 proteolytic and/or lipolytic organisms per ml
Correct Answer: both temporary and permanent hardness of water
Correct Answer: Aluminum sulphate
Correct Answer: secondary treatment
Correct Answer: remove particles that are more dense than water
Correct Answer: chemical coagulation and flocculation
Correct Answer: 2000 mg/l
Correct Answer: chlorides and sulfates of calcium and magnesium
Correct Answer: rain water
Correct Answer: 300 ppm
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