Discussion
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- Question
The maximum permissible limit (BIS) of turbidity in drinking water is
Options- A. 5 NTU
- B. 10 NTU
- C. 15 NTU
- D. 20 NTU
- Correct Answer
- 10 NTU
- 1. Zeolite softening process removes both temporary and permanent hardness of water. In this process the calcium and magnesium present in water are precipitated as
Options- A. insoluble carbonates
- B. insoluble zeolites
- C. insoluble chlorides
- D. insoluble sulfates Discuss
- 2. The ultimate source of water is
Options- A. rivers and lakes
- B. dew and forest
- C. rain and snow
- D. underground and surface Discuss
- 3. From the following sanitizers which one comes under category of surface active agents?
Options- A. Tetra phosphate
- B. Teepol
- C. Meta phosphate
- D. None of these Discuss
- 4. The activated sludge process is sometime referred as
Options- A. fluid bed biological oxidation system
- B. fixed bed biological oxidation system
- C. turning bed biological oxidation system
- D. none of the above Discuss
- 5. Sanitizer used specifically for vitreous enamel are
Options- A. strong alkalis
- B. strong acids
- C. weak alkali with sodium silicate
- D. none of these Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Water Treatment problems
Search Results
Correct Answer: insoluble zeolites
Correct Answer: rain and snow
Correct Answer: Teepol
Correct Answer: fluid bed biological oxidation system
Correct Answer: weak alkali with sodium silicate
Correct Answer: 10% sodium chloride solution
Correct Answer: 0.05 mg/l
Correct Answer: carbon dioxide
Correct Answer: amount of oxygen that would be removed from the water in order to oxidize pollution
Correct Answer: make it unfit for drinking
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