Water Treatment problems
- 1. The maximum permissible limit (BIS) of turbidity in drinking water is
Options- A. 5 NTU
- B. 10 NTU
- C. 15 NTU
- D. 20 NTU Discuss
Correct Answer: 10 NTU
- 2. Zeolite used in zeolite softening process for the treatment of hard water gets exhausted after certain time of usage but can be regenerated by flushing it with
Options- A. 10% calcium chloride solution
- B. 10% magnesium sulfate solution
- C. 10% magnesium chloride solution
- D. 10% sodium chloride solution Discuss
Correct Answer: 10% sodium chloride solution
- 3. The maximum desirable limit Bureau of Indian Standards (BIS) of lead in the drinking water is
Options- A. 0.05 mg/l
- B. 0.09 mg/l
- C. 0.1 mg/l
- D. 1.0 mg/l Discuss
Correct Answer: 0.05 mg/l
- 4. When temporary hard water is boiled, one of the substances formed is
Options- A. calcium bicarbonate
- B. calcium sulfate
- C. hydrogen chloride
- D. carbon dioxide Discuss
Correct Answer: carbon dioxide
- 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
Correct Answer: amount of oxygen that would be removed from the water in order to oxidize pollution
- 6. 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
Correct Answer: make it unfit for drinking
- 7. Permanent hard water may be softened by passing it through
Options- A. sodium silicate
- B. sodium bicarbonate
- C. sodium hexametaphosphate
- D. sodium phosphate Discuss
Correct Answer: sodium hexametaphosphate
- 8. 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
Correct Answer: remove particles that are more dense than water
- 9. 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
Correct Answer: secondary treatment
- 10. 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
Correct Answer: Aluminum sulphate
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