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