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MCQs

Total Questions : 1556 | Page 15 of 156 pages
Question 141. For large sewers, maximum distance between manholes may be
  1.    50 m
  2.    100 m
  3.    200 m
  4.    300 m
 Discuss Question
Answer: Option D. -> 300 m
Question 142. In sewage, the solids in mg per litre is
  1.    100 to 500
  2.    500 to 1000
  3.    1000 to 1500
  4.    1500 to 2000
 Discuss Question
Answer: Option B. -> 500 to 1000
Question 143. For the COD test of sewage, organic matter is oxidised by K₂Cr₂O₇ in the presence of
  1.    H₂SO₄
  2.    HNO₃
  3.    HCl
  4.    None of these
 Discuss Question
Answer: Option A. -> H₂SO₄
Question 144. Pathogens (or pathogenic bacterias) in water may cause
  1.    Typhoid
  2.    Cholera
  3.    Dysentery
  4.    All the above
 Discuss Question
Answer: Option D. -> All the above
Question 145. To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of
  1.    Hydrochloric acid
  2.    Sulphuric acid
  3.    Nitric acid
  4.    Citric acid
 Discuss Question
Answer: Option B. -> Sulphuric acid
Question 146. Stone ware pipes are
  1.    Highly resistant to sulphide corrosion
  2.    Highly impervious
  3.    Hydraulically efficient because of their smooth interior surface
  4.    Especially suited to pressure pipes
 Discuss Question
Answer: Option D. -> Especially suited to pressure pipes
Question 147. Pick up the correct statement from the following:
  1.    The ratio of the quantity of the diluting water to that of the sewage, is known as dilution factor
  2.    The automatic purification of polluted water, is known self purification phenomenon
  3.    The photosynthesis is carried out in the presence of sun light
  4.    All the above
 Discuss Question
Answer: Option D. -> All the above
Question 148. Pick up the correct statement from the following:
  1.    The water supply pipes carry pure water free from solid particles
  2.    The water supply pipes get clogged if flow velocity is less than self cleansing velocity
  3.    The sewers may be carried up and down the hills and valleys
  4.    The sewer pipes are generally laid along level hills
 Discuss Question
Answer: Option A. -> The water supply pipes carry pure water free from solid particles
Question 149. An inverted siphon is designed generally for
  1.    One pipe
  2.    Two pipes
  3.    Three pipes
  4.    Four pipes
 Discuss Question
Answer: Option C. -> Three pipes
Question 150. In sewers the gas generally found, is
  1.    Hydrogen sulphide (H2S)
  2.    Carbon dioxide (CO2)
  3.    Methane (CH4)
  4.    All the above
 Discuss Question
Answer: Option D. -> All the above

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