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. The effluent of a septic tank is
2. Rate of flow of sewage is generally assumed
3. Maximum permissible velocity 1.5 m/sec, is adopted in drains
4. he most dangerous pollutant in vehicular emissions is
5. For design purposes, the normal rate of infiltration of ground water into the sewer, is
6. During preliminary treatment of a sewage
7. 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
8. Nitrogen cycle of sewage, is
9. A drop manhole is provided if
10. In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is
11. The digested sludge from septic tanks, is removed after a maximum period of
12. The detention period for plain sedimentation water tanks, is usually
13. For providing an Indian type W.C., the R.C.C. slabs in the toilet portion
14. Pick up the correct statement from the following :
15. The presence of free ammonia in sewage, is detected by
16. Dry water flow in a combined sewer, is
17. 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
18. In sewage having fully oxidised organic matter, the nitrogen exists in the form of
19. The drop man holes are generally provided in sewers for
20. In sewers the highest non-scouring velocity is achieved in
21. The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known
22. The clarigesters are
23. The small sewers are cleaned by
24. Fresh sewage may become stale in
25. It is customary to design a sewer for D.W.F. on the basis of
26. Pick up the correct statement from the following :
27. The liquid wastes from kitchens, bath rooms and wash basins, is not called
28. The effluent of a septic tank is
29. The standard B.O.D. of water is taken for
30. A manhole is classified as shallow if its depth is between
31. 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









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