The gas which may cause explosion in sewers, is_________________?

Related Mcqs:

1. In sewers the gas generally found, is_________________?

   A. Hydrogen sulphide (H2S)
   B. Carbon dioxide (CO2)
   C. Methane (CH4)
   D. All the above

2. The minimum recommended diameter of sewers, is_________________?

   A. 5 cm
   B. 10 cm
   C. 15 cm
   D. 20 cm

3. The gas evolved in sewers is________________?

   A. Carbondioxide
   B. Hydrogen sulphide
   C. Methane
   D. All of these

4. Setting out the alignments of sewers may start from__________________?

   A. City
   B. Out-fall
   C. Tail end
   D. Any point

5. For large sewers, maximum distance between manholes may be_______________?

   A. 50 m
   B. 100 m
   C. 200 m
   D. 300 m

6. The asbestos cement sewers are_________________?

   A. Light in weight
   B. Not structurally strong to bear large compressive stress
   C. Susceptible to corrosion by sulphuric acid
   D. All the above

7. For sewers, inverted siphon is provided for___________________?

   A. One pipe
   B. Two pipes
   C. Three pipes
   D. Four pipes

8. The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is____________________?

   A. 20 m
   B. 30 m
   C. 45 m
   D. 75 m

9. The gradient of sewers depends upon_________________?

   A. Velocity of flow
   B. Diameter of the sewer
   C. Discharge
   D. All the above

10. In sewers the velocity of flow should not be_________________?

    A. More than the self-cleansing velocity
    B. Less than the self-cleansing velocity
    C. Less than 10 m/sec
    D. More than 20 m/sec