Sewers MCQ – Environmental Engineering

1. To dispose waste water produced by public, the underground pipe line is laid down, which is known as

  1. Sewer
  2. Drains
  3. Canal
  4. Tunnel
Answer. a

2. A sewer that receives the discharge of a number of house sewers is called

  1. house sewer
  2. lateral sewer
  3. intercepting sewer
  4. none of the above
Answer. b

3. In sewers designed with self-cleansing velocity

  1. the bottom is silted
  2. the bottom is scoured
  3. both silting and scouring occur at the bottom
  4. neither silting nor scouring occur at the bottom
Answer. d

4. Self cleaning velocities in sewers are achieved by

  1. providing large diameter sewer pipes
  2. providing adequate discharge through sewer lines
  3. providing minimum bends in sewer lines
  4. providing smooth surface of sewer pipes
Answer. b

5. Three different types of sewers are

  1. sanitary, storm, and conventional
  2. sanitary, storm, and combined
  3. sanitary, storm, and ground water
  4. conventional, surface, and combined
Answer. b

6. The drop manholes are generally provided in sewers for

  1. Industrial areas
  2. Large townships
  3. Cities in plains
  4. Hilly townships
  5. All of the above options
Answer. d

7. The maximum spacing of manholes specified as per Indian Standards in sewers upto 0.3 m diameter is

  1. 75 m
  2. 60 m
  3. 45 m
  4. 30 m
Answer. c

8. The sewer which resists sulphide corrosion is

  1. Cast iron sewer
  2. Lead sewer
  3. Brick sewer
  4. RCC sewer
Answer. b

9. The most commmony used sewer under culvert is

  1. circular sewer
  2. semi-elliptic sewer
  3. egg-shaped sewer
  4. horseshoe-type sewer
Answer. a

10. The sewer which receives the discharge from number of independent houses is called

  1. intercepting sewer
  2. hose sewer
  3. lateral sewer
  4. none of the above
Answer. c

11. A sewer which receives sewage from the collection system and conducts it to a point of final disposal is called

  1. Trunk sewer
  2. Common sewer
  3. Branch sewer
  4. Outfall sewer
Answer. a

12. The gas which is generally found in sewers is

  1. H2S
  2. CO2
  3. CH4
  4. All of the above
Answer. d

13. Sewer that receives sewage from the collecting systems and conducts it to a point of final discharge or to disposal plant is called

  1. Lateral sewer
  2. Relief sewer
  3. Outfall sewer
  4. Intercepting sewer
Answer. c

14. The sewer which transports the sewage to the point of treatment, is called

  1. House sewer
  2. Main Sewer
  3. Outfall sewer
  4. None of these
Answer. c

15. A sewer that receives the discharge of a number of house sewers is called

  1. lateral sewer
  2. house sewer
  3. sub-main sewer
  4. intercepting sewer
Answer. a
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