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MCQs

Total Questions : 828 | Page 4 of 83 pages
Question 31. Disinfection of water results in
  1.    Removal of turbidity
  2.    Removal of hardness
  3.    Killing of disease bacteria
  4.    Complete sterilisation
 Discuss Question
Answer: Option C. -> Killing of disease bacteria
Question 32. If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to
  1.    Total alkalinity
  2.    Total hardness
  3.    Total hardness total alkalinity
  4.    Non carbonate hardness
 Discuss Question
Answer: Option A. -> Total alkalinity
Question 33. Laying of sewers is usually done with the help of
  1.    A Theodolite
  2.    A compass
  3.    Sight rails and boning rods
  4.    A plane table
 Discuss Question
Answer: Option C. -> Sight rails and boning rods
Question 34. The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by
  1.    TOD > BOD > COD
  2.    TOD > COD > BOD
  3.    BOD > COD > TOD
  4.    COD > BOD > TOD
 Discuss Question
Answer: Option B. -> TOD > COD > BOD
Question 35. As compared to shallow wells, deep wells have
  1.    More depth
  2.    Less depth
  3.    More discharge
  4.    Less discharge
 Discuss Question
Answer: Option C. -> More discharge
Question 36. As compared to cast iron pipes, steel pipes are
  1.    Heavier
  2.    Stronger
  3.    Costlier
  4.    Less susceptible to corrosion
 Discuss Question
Answer: Option B. -> Stronger
Question 37. In water treatment, rapid gravity filters are adopted to remove
  1.    Dissolved organic substances
  2.    Dissolved solids and dissolved gases
  3.    Floating solids and dissolved inorganic solids
  4.    Bacteria and colloidal solids
 Discuss Question
Answer: Option D. -> Bacteria and colloidal solids
Question 38. In facultative stabilization pond, the sewage is treated by
  1.    Aerobic bacteria only
  2.    Algae only
  3.    Dual action of aerobic bacteria and anaerobic bacteria
  4.    Sedimentation
 Discuss Question
Answer: Option C. -> Dual action of aerobic bacteria and anaerobic bacteria
Question 39. The gas from sludge digestion tank is mainly composed of
  1.    Nitrogen
  2.    Carbon dioxide
  3.    Hydrogen sulphide
  4.    Methane
 Discuss Question
Answer: Option D. -> Methane
Question 40. The maximum efficiency of BOD removal is achieved in
  1.    Oxidation pond
  2.    Oxidation ditch
  3.    Aerated lagoons
  4.    Trickling filters
 Discuss Question
Answer: Option B. -> Oxidation ditch

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