Lakshya Education MCQs

Question: Inter-distance between ventilation columns in a sewer line is kept
Options:
A.25 to 50 m
B.50 m to 100 m
C.100 m to 150 m
D.150 m to 300 m
Answer: Option D

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More Questions on This Topic :

Question 1. The factor responsible for purification of sewage in river is
  1.    Hydrology
  2.    Dissolved oxygen in water
  3.    Temperature
  4.    All the above
Answer: Option D
Question 2. Pick up the incorrect statement from the following:
  1.    Manholes are provided in sewer pipes at suitable intervals
  2.    Catch basins are generally provided in sewers for carrying drainage discharge
  3.    Inlets are generally provided in all sewers
  4.    None of these
Answer: Option C
Question 3. Pick up the correct statement from the following:
  1.    pH value indicates acidity and alkalinity of sewage
  2.    In acidic sewage, the pH value is less than 7
  3.    In alkaline sewage, the pH value is more than 7
  4.    All the above
Answer: Option D
Question 4. The pressure exerted by
  1.    The sewage when running full from inside, is called internal pressure
  2.    The internal pressure if any, causes tensile stress in the pipe material
  3.    Pressure sewers are designed to be safe in tension
  4.    All the above
Answer: Option D
Question 5. If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains
  1.    Hydrogen sulphide
  2.    Carbon dioxide
  3.    Methane
  4.    Oxygen
Answer: Option B
Question 6. If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains
  1.    Hydrogen sulphide
  2.    Carbon dioxide
  3.    Methane
  4.    Oxygen
Answer: Option A

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