Discussion
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- Question
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
- Correct Answer
- Aluminum sulphate
- 1. 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
- 2. 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
- 3. Permanent hard water may be softened by passing it through
Options- A. sodium silicate
- B. sodium bicarbonate
- C. sodium hexametaphosphate
- D. sodium phosphate Discuss
- 4. Hardness of water does not
Options- A. have any bad effect in boiler
- B. make cooking of foods difficult
- C. make it unfit for drinking
- D. cause difficulty in the washing of clothes with soaps Discuss
- 5. The chemical oxygen demand (COD)measures the
Options- A. amount of oxygen required for growth of microorganisms in water
- B. amount of oxygen that would be removed from the water in order to oxidize pollution
- C. amount of oxygen required to oxidize the calcium present in waste water
- D. none of the above Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. Conventional tertiary treatment is
Options- A. chemical coagulation and flocculation
- B. filtration
- C. sedimentation
- D. none of these Discuss
- 10. 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
Water Treatment problems
Search Results
Correct Answer: secondary treatment
Correct Answer: remove particles that are more dense than water
Correct Answer: sodium hexametaphosphate
Correct Answer: make it unfit for drinking
Correct Answer: amount of oxygen that would be removed from the water in order to oxidize pollution
Correct Answer: both temporary and permanent hardness of water
Correct Answer: 5 proteolytic and/or lipolytic organisms per ml
Correct Answer: sodium carbonate
Correct Answer: chemical coagulation and flocculation
Correct Answer: 2000 mg/l
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