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MCQs

Total Questions : 1556 | Page 1 of 156 pages
Question 1. The most dangerous pollutant in vehicular emissions is
  1.    CO₂
  2.    SO₂
  3.    CO₂
  4.    O₂
 Discuss Question
Answer: Option C. -> CO₂
Question 2. The design period in years for pumping plants, is
  1.    1
  2.    2 to 3
  3.    3 to 5
  4.    5 to 10
 Discuss Question
Answer: Option D. -> 5 to 10
Question 3. The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is
  1.    25 %
  2.    50 %
  3.    10 %
  4.    5 %
 Discuss Question
Answer: Option B. -> 50 %
Question 4. At the junction of sewers
  1.    Top of smaller sewer is kept lower
  2.    Top of larger sewer is kept lower
  3.    Tops of both the sewers are at the same level
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 5. The most effective arrangement for diverting excess storm water into a natural drainage, is
  1.    Leaping weir
  2.    Overflow weir
  3.    Siphon spill way
  4.    None of these
 Discuss Question
Answer: Option C. -> Siphon spill way
Question 6. Imhoff cone is used to determine
  1.    Settleable solids
  2.    Suspended solids
  3.    Dissolved solids
  4.    None of these
 Discuss Question
Answer: Option A. -> Settleable solids
Question 7. The algae dies out in the zone of
  1.    Degradation
  2.    Active decomposition
  3.    Recovery
  4.    Cleaner water
 Discuss Question
Answer: Option A. -> Degradation
Question 8. For detecting the nitrates in sewage, the colour may be developed by adding
  1.    Potassium permanganate
  2.    Sulphuric acid and napthamine
  3.    Phenol-di -sulphuric acid and potassium hydroxide
  4.    None of these
 Discuss Question
Answer: Option C. -> Phenol-di -sulphuric acid and potassium hydroxide
Question 9. For detecting the nitrites in the sewage, the matching colour may be developed by adding
  1.    Potassium permanganate
  2.    Sulphuric acid and napthamine
  3.    Phenol-di -sulphuric acid potassium hydroxide
  4.    None of these
 Discuss Question
Answer: Option B. -> Sulphuric acid and napthamine
Question 10. The average temperature of sewage in India, is
  1.    10°C
  2.    15°C
  3.    20°C
  4.    25°C
 Discuss Question
Answer: Option C. -> 20°C

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