waste water engineering MCQs – Page 12

Practise focused waste water engineering questions with marked answers for exam preparation and subject revision.

waste water engineering Mcqs
221. are available in size Stoneware sewers________________?
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A. All the above

B. 10 cm

C. 20 cm

D. 15 cm

222. The sewage treatment in septic tanks is due to__________________?
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A. Aerobic decomposition

B. None of these

C. Parasitic decomposition

D. Anaerobic decomposition
223. The water carried sewerage system removes__________________?
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A. Domestic sewage

B. Storm sewage

C. Industrial sewage

D. All the above
224. Sludge banks are formed if sewage is disposed of in____________________ ?
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A. Seas

B. Lakes

C. Rivers

D. None of these

225. The intensity of rain is expressed in________________?
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A. cm/minute

B. None of these

C. cm/hour

D. cm/day

226. The drop man holes are generally provided in sewers for____________________?
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A. Hilly town ships

B. Industrial areas

C. Large town ships

D. Cities in plains

227. If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by_________________?
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A. Bazin

B. Kutter

C. Manning

D. Chezy

228. For providing an Indian type W.C., the R.C.C. slabs in the toilet portion__________________?
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A. Should be sunk by 50 cm

B. Should be sunk by 20 cm

C. Should be kept 20 cm above the adjacent portion

D. Need not be sunk

229. The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope_________________?
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A. 1 in 15

B. 1 in 20

C. 1 in 5

D. 1 in 10
230. Assertion A.: A free board of 0.3 m is provided above the top sewage line in septic tanks. Reason (R): It helps to accommodate the scum in the septic tank_________________?
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A. Both A and R is true and R is the correct explanation of A

B. Both A and R is true but R is not a correct explanation of A

C. A is true but R is false

D. A is false but R is true

231. The quantity of liquid waste which flows in sewers during the period of rainfall, is known__________________?
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A. Sanitary sewage

B. None of these

C. Industrial waste

D. Storm sewage
232. When drainage to sewage ratio is 20, the peak dry weather flow is_______________?
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A. 20% of the design discharge

B. Slightly less than 5% of the design discharge

C. None of these

D. Slightly more than 5% of the design discharge

233. If is the diameter of upper circular portion, the area of cross-section of a standard egg shaped sewer, is____________________?
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A. D

B. D

C. D

D. D
234. If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains__________________?
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A. Methane

B. Carbon dioxide

C. Hydrogen sulphide

D. Oxygen

235. In SI units the power of sound is represented in __________________?
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A. Watts

B. Newtons

C. Kgs

D. Joules

236. Water content of sewage is about___________________?
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A. 90%

B. 99%

C. 95%

D. 9.9 %
237. Drop manholes are the manholes___________________?
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A. With depths more than 3.5 m

B. Without entry ladders

C. Having drains at different levels

D. Without manhole covers

238. Pick up the incorrect size of stone ware sewers_________________?
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A. 82.5 cm

B. None of these

C. 52.5 cm

D. 67.5 cm

239. Primary treatment of sewage consists of removal of__________________?
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A. Large suspended organic solids

B. Sand and girt

C. Floating materials

D. Oil and grease

240. The minimum recommended diameter of sewers, is_________________?
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A. 10 cm

B. 15 cm

C. 5 cm

D. 20 cm