Environmental Engineering(Civil Engineering ) Questions and Answers

Question 1. Which of the following values of pH represents a stronger acid?
  1.    2
  2.    5
  3.    7
  4.    10
Explanation:-
Answer: Option A. -> 2
Question 2. The distribution mains are designed for
  1.    Maximum daily demand
  2.    Maximum hourly demand
  3.    Average daily demand
  4.    Maximum hourly demand on maximum day
Explanation:-
Answer: Option D. -> Maximum hourly demand on maximum day
Question 3. For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as
  1.    4.5 to 6.0
  2.    6.5 to 8.0
  3.    8.5 to 10.0
  4.    10.5 to 12.0
Explanation:-
Answer: Option B. -> 6.5 to 8.0
Question 4. The pathogens can be killed by
  1.    Nitrification
  2.    Chlorination
  3.    Oxidation
  4.    None of the above
Explanation:-
Answer: Option B. -> Chlorination
Question 5. Sewage treatment units are designed for
  1.    Maximum flow only
  2.    Minimum flow only
  3.    Average flow only
  4.    Maximum and minimum flow
Explanation:-
Answer: Option C. -> Average flow only
Question 6. Which of the following chemical compounds can be used for de-chlorination of water?
  1.    Carbon dioxide
  2.    Bleaching powder
  3.    Sulphur dioxide
  4.    Chloramines
Explanation:-
Answer: Option C. -> Sulphur dioxide
Question 7. The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally
  1.    Less and more
  2.    Less and less
  3.    More and less
  4.    More and more
Explanation:-
Answer: Option C. -> More and less
Question 8. The suitable method for disinfection of swimming pool water is
  1.    Ultra violet rays treatment
  2.    Lime treatment
  3.    By using potassium permanganate
  4.    Chlorination
Explanation:-
Answer: Option A. -> Ultra violet rays treatment
Question 9. The type of valve which is provided to control the flow of water in the distribution system at street corners and where the pipe lines intersect is
  1.    Check valve
  2.    Sluice valve
  3.    Safety valve
  4.    Scour valve
Explanation:-
Answer: Option B. -> Sluice valve
Question 10. Disinfection efficiency is
  1.    Reduced at higher pH value of water
  2.    Unaffected by pH value of water
  3.    Increased at higher pH value of water
  4.    Highest at pH value equal to 7
Explanation:-
Answer: Option A. -> Reduced at higher pH value of water
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