MCQOPTIONS
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MCQOPTIONS
This section includes 641 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
Imhoff cone is used to determine_____________________? |
| A. | Settleable solids |
| B. | Suspended solids |
| C. | Dissolved solids |
| D. | None of these |
| Answer» B. Suspended solids | |
| 202. |
If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is___________________? |
| A. | 1045 mm |
| B. | 1065 mm |
| C. | 1075 mm |
| D. | 1095 mm |
| Answer» E. | |
| 203. |
If the pH value of sewage is 7__________________? |
| A. | It is acidic |
| B. | It is alkaline |
| C. | It is neutral |
| D. | None of these |
| Answer» D. None of these | |
| 204. |
If the peak discharge of a storm water drain (S.W. Drain) is expected to exceed 150 cumecs, the free board to be provided, is_________________? |
| A. | 100 cm |
| B. | 90 cm |
| C. | 80 cm |
| D. | 50 cm |
| Answer» B. 90 cm | |
| 205. |
If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is________________? |
| A. | 2 hours |
| B. | 3 hours |
| C. | 4 hours |
| D. | 5 hours |
| Answer» D. 5 hours | |
| 206. |
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is___________________? |
| A. | 2 hours |
| B. | 4 hours |
| C. | 6 hours |
| D. | 8 hours |
| Answer» E. | |
| 207. |
If the grit in grit chambers is 4.5 million litres per day, its cleaning is done____________________? |
| A. | Manually |
| B. | Mechanically |
| C. | Hydraulically |
| D. | Electrically |
| Answer» B. Mechanically | |
| 208. |
If the flame of a miner’s safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains_______________? |
| A. | Hydrogen sulphide |
| B. | Carbon dioxide |
| C. | Methane |
| D. | Oxygen |
| Answer» D. Oxygen | |
| 209. |
If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains_______________? |
| A. | Hydrogen sulphide |
| B. | Carbon dioxide |
| C. | Methane |
| D. | Oxygen |
| Answer» C. Methane | |
| 210. |
If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is__________________? |
| A. | 1.39 m |
| B. | 1.49 m |
| C. | 1.59 m |
| D. | 1.69 m |
| Answer» E. | |
| 211. |
If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is___________________? |
| A. | 1 in 60 |
| B. | 1 in 100 |
| C. | 1 in 120 |
| D. | None of these |
| Answer» D. None of these | |
| 212. |
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is__________________? |
| A. | 1 in 60 |
| B. | 1 in 100 |
| C. | 1 in 120 |
| D. | None of these |
| Answer» B. 1 in 100 | |
| 213. |
If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is________________? |
| A. | 1 in 60 |
| B. | 1 in 100 |
| C. | 1 in 120 |
| D. | None of these |
| Answer» C. 1 in 120 | |
| 214. |
If the depth of partial flow in a sewer of diameter 2 m, is 50 cm, its wetted perimeter is____________________ ? |
| A. | 1/3 |
| B. | 0/2 |
| C. | 0/2 |
| D. | 2 /3 |
| Answer» E. | |
| 215. |
If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is______________? |
| A. | ΠD/2 |
| B. | ΠD/4 |
| C. | ΠD/3 |
| D. | πD |
| Answer» D. πD | |
| 216. |
If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is_____________________? |
| A. | 50 ppm |
| B. | 100 ppm |
| C. | 150 ppm |
| D. | 200 ppm |
| Answer» E. | |
| 217. |
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_________________? |
| A. | 50 mg/l |
| B. | 100 mg/l |
| C. | 150 mg/l |
| D. | 250 mg/l |
| Answer» E. | |
| 218. |
If q is the average sewage flow from a city of population P, the maximum sewage flow______________? |
| A. | Q = [(4 + )/(18 + )] q |
| B. | Q = [(18 + P)/(4 + )] q |
| C. | Q = [(18 + )/(4 + )] q |
| D. | Q = [(5 + )/((15 + )] q |
| Answer» D. Q = [(5 + )/((15 + )] q | |
| 219. |
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_________________? |
| A. | Chezy |
| B. | Manning |
| C. | Bazin |
| D. | Kutter |
| Answer» C. Bazin | |
| 220. |
If is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, Is_____________________? |
| A. | 1.250 D |
| B. | 1.350 D |
| C. | 1.425 D |
| D. | 1.625 D |
| Answer» E. | |
| 221. |
If is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is___________________? |
| A. | D |
| B. | 1.25 D |
| C. | 1.5 D |
| D. | 1.75 D |
| Answer» D. 1.75 D | |
| 222. |
If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of__________________? |
| A. | Degradation |
| B. | Active decomposition |
| C. | Recovery |
| D. | Cleaner water |
| Answer» C. Recovery | |
| 223. |
If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is_______________? |
| A. | D’ = 0.64 D |
| B. | D’ = 0.74 D |
| C. | D’ = 0.84 D |
| D. | D’ = 0.94 D |
| Answer» D. D’ = 0.94 D | |
| 224. |
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains__________________? |
| A. | Hydrogen sulphide |
| B. | Carbon dioxide |
| C. | Methane |
| D. | Oxygen |
| Answer» B. Carbon dioxide | |
| 225. |
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is_________________? |
| A. | 100 mg/l |
| B. | 200 mg/l |
| C. | 300 mg/l |
| D. | 400 mg/l |
| Answer» E. | |
| 226. |
If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is____________________? |
| A. | 200 ppm |
| B. | 225 ppm |
| C. | 250 ppm |
| D. | None of these |
| Answer» D. None of these | |
| 227. |
hydraulically equivalent, the relationship which holds good, is _______________? |
| A. | D8/3 = 4 b8/3 |
| B. | D3/8 = 4 b3/8 |
| C. | D2/3 = 4 b2/3 |
| D. | D3/2 = 4 b3/2 |
| Answer» B. D3/8 = 4 b3/8 | |
| 228. |
Hydraulic mean radius is_______________? |
| A. | Mean radius of sewer |
| B. | Difference in heads between two points in circular pipes |
| C. | Mean of radii in a pipe line of varying cross -sections |
| D. | Cross-sectional area/wetted perimeter |
| Answer» E. | |
| 229. |
Hume steel pipes are__________________? |
| A. | Steel pipes |
| B. | Steel shell coated from inside with cement mortar |
| C. | Steel shell coated from outside with cement mortar |
| D. | Both B. and C. |
| Answer» E. | |
| 230. |
House connections to the laterals is generally made by___________________? |
| A. | R.C.C. |
| B. | P.C.C. |
| C. | Cast iron |
| D. | Glazed stonewares |
| Answer» E. | |
| 231. |
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter______________________? |
| A. | Less than 0.01 mm |
| B. | Less than 0.05 mm |
| C. | Less than 0.1 mm |
| D. | Greater than 0.1 mm |
| Answer» E. | |
| 232. |
Fresh sewage may become stale in_________________? |
| A. | One hour |
| B. | Two to three hours |
| C. | Three to four hours |
| D. | Six hours |
| Answer» D. Six hours | |
| 233. |
Fresh sewage is generally_____________________? |
| A. | Alkaline |
| B. | Acidic |
| C. | Highly decomposed |
| D. | A source of objectionable odour |
| Answer» B. Acidic | |
| 234. |
For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed________________? |
| A. | 1.5 |
| B. | 2.0 |
| C. | 2.5 |
| D. | 3.0 |
| Answer» B. 2.0 | |
| 235. |
For trunk and out-fall, the type of sewers generally used, is_____________________? |
| A. | Standard egg shaped |
| B. | Circular shaped |
| C. | Horse shoe shaped |
| D. | Parabolic shaped |
| Answer» D. Parabolic shaped | |
| 236. |
For treating the sewage of a large city, you will recommend_________________? |
| A. | A sedimentation tank and an activated sludge treatment plant |
| B. | A plant consisting of Imhoff tanks with low rate trickling filters |
| C. | Sedimentation tanks with high rate trickling filters |
| D. | None of these |
| Answer» B. A plant consisting of Imhoff tanks with low rate trickling filters | |
| 237. |
For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed________________? |
| A. | 3 ppm |
| B. | 4 ppm |
| C. | 5 ppm |
| D. | 10 ppm |
| Answer» C. 5 ppm | |
| 238. |
For the open drain (N = 0.025) shown in the below figure, the discharge is________________? |
| A. | 26.88 cumecs |
| B. | 27.88 cumecs |
| C. | 28.88 cumecs |
| D. | 29.88 cumecs |
| Answer» D. 29.88 cumecs | |
| 239. |
For the COD test of sewage, organic matter is oxidised by K2Cr2O7 in the presence of________________? |
| A. | H2SO4 |
| B. | HNO3 |
| C. | HCl |
| D. | None of these |
| Answer» B. HNO3 | |
| 240. |
For sewers, inverted siphon is provided for___________________? |
| A. | One pipe |
| B. | Two pipes |
| C. | Three pipes |
| D. | Four pipes |
| Answer» D. Four pipes | |
| 241. |
For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed__________________? |
| A. | 1.5 |
| B. | 2.0 |
| C. | 2.5 |
| D. | 3.0 |
| Answer» C. 2.5 | |
| 242. |
For providing an Indian type W.C., the R.C.C. slabs in the toilet portion__________________? |
| A. | Should be sunk by 20 cm |
| B. | Should be kept 20 cm above the adjacent portion |
| C. | Should be sunk by 50 cm |
| D. | Need not be sunk |
| Answer» D. Need not be sunk | |
| 243. |
For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is____________________? |
| A. | Cast iron sewers |
| B. | Cement concrete sewers |
| C. | Glazed bricks sewers |
| D. | Stone ware sewers |
| Answer» D. Stone ware sewers | |
| 244. |
For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of___________________? |
| A. | 100 cm |
| B. | 120 cm |
| C. | 140 cm |
| D. | 160 cm |
| Answer» E. | |
| 245. |
For large sewers, maximum distance between manholes may be_______________? |
| A. | 50 m |
| B. | 100 m |
| C. | 200 m |
| D. | 300 m |
| Answer» E. | |
| 246. |
For house drainage minimum gradient is__________________? |
| A. | 1 in 60 |
| B. | 1 in 80 |
| C. | 1 in 10 |
| D. | 1 in 400 |
| Answer» B. 1 in 80 | |
| 247. |
For evaporation and measurement of settable solids, the apparatus used, is________________? |
| A. | A jar |
| B. | A breaker |
| C. | A test tube |
| D. | An Imhoff cone |
| Answer» E. | |
| 248. |
For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by______________? |
| A. | Kinchling |
| B. | Lloyd Davis |
| C. | Frubling |
| D. | All the above |
| Answer» E. | |
| 249. |
For efficient working of a sewer, it must be ensured that _____________? |
| A. | Minimum velocity of 0.45 m/sec, is maintained at its minimum flow |
| B. | A maximum velocity of 0.90 m/sec, is maintained at its maximum flow |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 250. |
For drainage pipes in buildings the test applied before putting them to use, is__________________? |
| A. | Water test |
| B. | Smoke test |
| C. | Straightness test |
| D. | All the above |
| Answer» C. Straightness test | |