Civil Engineering – Waste Water Engineering Mock test – 2



Welcome to your Waste Water Engineering Mock test -2
Take an exciting test in Waste Water Engineering 
You have only 20 mins to complete the test (31 Questions)
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1. In sewers the highest non-scouring velocity is achieved in
2. Fresh sewage may become stale in
3. A manhole is classified as shallow if its depth is between
4. Nitrogen cycle of sewage, is
5. The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is
6. During preliminary treatment of a sewage
7. The effluent of a septic tank is
8. The small sewers are cleaned by
9. The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known
10. The presence of free ammonia in sewage, is detected by
11. Rate of flow of sewage is generally assumed
12. The digested sludge from septic tanks, is removed after a maximum period of
13. Pick up the correct statement from the following :
14. In sewage having fully oxidised organic matter, the nitrogen exists in the form of
15. It is customary to design a sewer for D.W.F. on the basis of
16. Maximum permissible velocity 1.5 m/sec, is adopted in drains
17. The detention period for plain sedimentation water tanks, is usually
18. The clarigesters are
19. The liquid wastes from kitchens, bath rooms and wash basins, is not called
20. Dry water flow in a combined sewer, is
21. For providing an Indian type W.C., the R.C.C. slabs in the toilet portion
22. Pick up the correct statement from the following :
23. If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is
24. The standard B.O.D. of water is taken for
25. For design purposes, the normal rate of infiltration of ground water into the sewer, is
26. In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is
27. he most dangerous pollutant in vehicular emissions is
28. The drop man holes are generally provided in sewers for
29. A drop manhole is provided if
30. To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is
31. The effluent of a septic tank is









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