Water Treatment(Engineering > Biochemical Engineering ) Questions and Answers

Question 1. Which of the following substances are commonly used in a filter?
  1.    Charcoal
  2.    Sand
  3.    Both (a) and (b)
  4.    Aluminum chloride
Explanation:-
Answer: Option C. -> Both (a) and (b)
Answer: (c).Both (a) and (b)
Question 2. The maximum permissible limit (BIS) of turbidity in drinking water is
  1.    5 NTU
  2.    10 NTU
  3.    15 NTU
  4.    20 NTU
Explanation:-
Answer: Option B. -> 10 NTU
Answer: (b).10 NTU
Question 3. The ultimate source of water is
  1.    rivers and lakes
  2.    dew and forest
  3.    rain and snow
  4.    underground and surface
Explanation:-
Answer: Option C. -> rain and snow
Answer: (c).rain and snow
Question 4. Biological oxidation processes usually referred as biological treatment, are the most common form of
  1.    primary treatment
  2.    secondary treatment
  3.    tertiary treatment
  4.    all of these
Explanation:-
Answer: Option B. -> secondary treatment
Answer: (b).secondary treatment
Question 5. Sedimentation is a physical process used in wastewater treatment to
  1.    remove particles that are less dense than water
  2.    remove particles that are more dense than water
  3.    remove the pertinacious material from the water
  4.    none of the above
Explanation:-
Answer: Option B. -> remove particles that are more dense than water
Answer: (b).remove particles that are more dense than water
Question 6. Temporary hardness of water may be removed by adding
  1.    calcium hydroxide
  2.    calcium carbonate
  3.    calcium chloride
  4.    sodium bicarbonate
Explanation:-
Answer: Option A. -> calcium hydroxide
Answer: (a).calcium hydroxide
Question 7. Both temporary and permanent hardness of water can be removed on boiling water with
  1.    calcium hydroxide
  2.    sodium carbonate
  3.    calcium oxide
  4.    calcium carbonate
Explanation:-
Answer: Option B. -> sodium carbonate
Answer: (b).sodium carbonate
Question 8. Permanent hardness of water may be removed by the addition of
  1.    lime
  2.    soda ash
  3.    potassium permagnate
  4.    sodium bicarbonate
Explanation:-
Answer: Option B. -> soda ash
Answer: (b).soda ash
Question 9. Lagoons may be characterized as
  1.    anaerobic
  2.    facultative
  3.    aerated
  4.    all of these
Explanation:-
Answer: Option D. -> all of these
Answer: (d).all of these
Question 10. The maximum desirable limit (BIS of mercury in the drinking water is
  1.    0.05 mg/l
  2.    0.9 mg/l
  3.    0.1 mg/l
  4.    0.001 mg/l
Explanation:-
Answer: Option D. -> 0.001 mg/l
Answer: (d).0.001 mg/l
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