Discussion
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- Question
Permanent hardness of water may be removed by the addition of
Options- A. lime
- B. soda ash
- C. potassium permagnate
- D. sodium bicarbonate
- Correct Answer
- soda ash
- 1. Both temporary and permanent hardness of water can be removed by
Options- A. boiling
- B. distillation
- C. filtration
- D. decantation Discuss
- 2. 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
- 3. 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
- 4. 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
- 5. Lagoons may be characterized as
Options- A. anaerobic
- B. facultative
- C. aerated
- D. all of these Discuss
- 6. The common methods used for disinfection in waste water treatment plants are
Options- A. chlorination
- B. UV light
- C. both (a) and (b)
- D. Phenolic solvent Discuss
- 7. Coliform bacteria in water is an indication of the presence of
Options- A. radioactive wastes
- B. excess fertilizer
- C. decaying animals and plants
- D. human feces Discuss
- 8. The methods used for biological treatment are
Options- A. lagoon
- B. activated sludge process
- C. oxidation ditches
- D. all of these Discuss
- 9. Temporary hardness of water may be removed by adding
Options- A. calcium hydroxide
- B. calcium carbonate
- C. calcium chloride
- D. sodium bicarbonate Discuss
- 10. Temporary hardness of water is caused by the presence of
Options- A. chlorides of calcium and magnesium
- B. sulfates of calcium and magnesium
- C. bicarbonates of calcium and magnesium
- D. carbonates of sodium and potassium Discuss
Water Treatment problems
Search Results
Correct Answer: distillation
Correct Answer: increase the percentage of gram(-)ve rods on utensils
Correct Answer: to prevent corrosion
Correct Answer: 0.001 mg/l
Correct Answer: all of these
Correct Answer: both (a) and (b)
Correct Answer: human feces
Correct Answer: all of these
Correct Answer: calcium hydroxide
Correct Answer: bicarbonates of calcium and magnesium
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