11. If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains
12. If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains
13. The pressure exerted by
14. The factor responsible for purification of sewage in river is
15. Inter-distance between ventilation columns in a sewer line is kept
16. Pick up the incorrect statement from the following:
17. Pick up the correct statement from the following:
18. The most efficient cross section of sewers in a separate sewerage system is
19. The most efficient cross-section of sewers in a combined sewerage system is
20. The minimum diameter of a sewer is kept
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