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









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