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MCQs

Total Questions : 1556 | Page 19 of 156 pages
Question 181. The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is
  1.    213.5 cm/sec
  2.    313.5 cm/sec
  3.    413.5 cm/sec
  4.    500 cm/sec
 Discuss Question
Answer: Option B. -> 313.5 cm/sec
Question 182. For evaporation and measurement of settable solids, the apparatus used, is
  1.    A jar
  2.    A breaker
  3.    A test tube
  4.    An Imhoff cone
 Discuss Question
Answer: Option D. -> An Imhoff cone
Question 183. As compared to fresh river water, sea water contains oxygen
  1.    10% less
  2.    20% less
  3.    10% more
  4.    20% more
 Discuss Question
Answer: Option B. -> 20% less
Question 184. You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at
  1.    Full depth
  2.    Half full
  3.    Two third full
  4.    Three fourth full
 Discuss Question
Answer: Option B. -> Half full
Question 185. The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is
  1.    Vs = 418 (Gs – Gw) d [(3T + 70)/100]
  2.    Vs = 418 (Gs – Gw)d² [(3T + 70)/100]
  3.    Vs = 218 (Gs – Gw)d² [(3T + 70)/100]
  4.    Vs = 218 (Gs – Gw)d [(3T + 70)/100]
 Discuss Question
Answer: Option B. -> Vs = 418 (Gs – Gw)d² [(3T + 70)/100]
Question 186. Sewer manholes are generally provided at
  1.    The change of gradient
  2.    The change of direction
  3.    The junctions of sewers
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 187. Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to
  1.    Initial demand
  2.    First stage demand
  3.    Carbonaceous demand
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 188. The asbestos cement pipes are generally laid
  1.    Horizontally
  2.    Vertically
  3.    At an angle of 30°
  4.    At an angle of 60°
 Discuss Question
Answer: Option B. -> Vertically
Question 189. PH value of sludge during alkaline regression stage, is
  1.    More than 7
  2.    Less than 7
  3.    Less than 6
  4.    More than 6
 Discuss Question
Answer: Option A. -> More than 7
Question 190. The small sewers are cleaned by
  1.    Flushing
  2.    Cane rodding
  3.    Wooden pills
  4.    None of these
 Discuss Question
Answer: Option A. -> Flushing

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