MCQOPTIONS
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MCQOPTIONS
This section includes 260 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. |
In case of sewer lines? |
| A. | Water test is carried out to check water tightness of the joints |
| B. | Test for straightness is carried out with the help of a lamp and mirror |
| C. | Obstruction test is carried out with the help of smooth ball of diameter 13 mm |
| D. | All the above |
| Answer» E. | |
| 202. |
Pick up the incorrect size of stone ware sewers? |
| A. | 52.5 cm |
| B. | 67.5 cm |
| C. | 82.5 cm |
| D. | None of these |
| Answer» E. | |
| 203. |
Pick up the incorrect statement from the following for allowing workers to enter sewers? |
| A. | The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes |
| B. | Proper tests for the presence of poisonous gases must be carried out |
| C. | The men entering the manhole should be advised to smoke in the sewer |
| D. | Warning signals should be erected |
| Answer» D. Warning signals should be erected | |
| 204. |
Setting out the alignments of sewers may start from? |
| A. | City |
| B. | Out-fall |
| C. | Tail end |
| D. | Any point |
| Answer» D. Any point | |
| 205. |
Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to? |
| A. | Initial demand |
| B. | First stage demand |
| C. | Carbonaceous demand |
| D. | All of these |
| Answer» E. | |
| 206. |
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. | |
| 207. |
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 | |
| 208. |
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. | |
| 209. |
The sewers? |
| A. | Must be of adequate size to avoid over flow |
| B. | Must flow under gravity ½ to ¾ full |
| C. | Must be laid at least 2 to 3 m deep to collect /water from the basements |
| D. | All the above |
| Answer» E. | |
| 210. |
Traps? |
| A. | Are water seals which prevent the entry of foul gases |
| B. | Are used to trap the rats entering sewers |
| C. | Dissolve the foul gases |
| D. | Create symphonic action to increase the quick disposal of sewerage |
| Answer» B. Are used to trap the rats entering sewers | |
| 211. |
In detritus tanks,? |
| A. | Flow velocity is kept 0.09 m/sec |
| B. | Detention period is kept 3 to 4 minutes |
| C. | Organic and inorganic materials are separated |
| D. | All the above |
| Answer» E. | |
| 212. |
The gas evolved in sewers is? |
| A. | Carbondioxide |
| B. | Hydrogen sulphide |
| C. | Methane |
| D. | All of these |
| Answer» E. | |
| 213. |
The sewerage system originates from? |
| A. | House sewers |
| B. | Lateral sewers |
| C. | Branch sewers |
| D. | Main sewers |
| Answer» B. Lateral sewers | |
| 214. |
The formula V = (1/n) r2/3? |
| A. | Chezy’s formula |
| B. | Bazin’s formula |
| C. | Kutter’s formula |
| D. | Manning’s formula |
| Answer» E. | |
| 215. |
Cement concrete sewers are only suitable if non-scouring velocity is between? |
| A. | 2.5 to 3.0 m/sec |
| B. | 3.0 to 4.0 m/sec |
| C. | 3.5 to 4.5 m/sec |
| D. | 4.5 to 5.5 m/sec |
| Answer» B. 3.0 to 4.0 m/sec | |
| 216. |
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is? |
| A. | 100 |
| B. | 1000 |
| C. | 5000 |
| D. | 10000 |
| Answer» E. | |
| 217. |
Disposal to sewage in large cities, is done in? |
| A. | Irrigation |
| B. | Dilution |
| C. | Oxidation |
| D. | Purification |
| Answer» C. Oxidation | |
| 218. |
No treatment of the sewage is given if dilution factor is? |
| A. | Less than 150 |
| B. | Between 150 to 200 |
| C. | Between 200 to 300 |
| D. | More than 500 |
| Answer» E. | |
| 219. |
A sewer running partially full and hurried with back filled, fails in compression due to? |
| A. | Weight of the pipe |
| B. | Weight of the back fill |
| C. | Superimposed traffic loads |
| D. | All the above |
| Answer» E. | |
| 220. |
The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is? |
| A. | 25 % |
| B. | 50 % |
| C. | 10 % |
| D. | 5 % |
| Answer» C. 10 % | |
| 221. |
The suitable cross-section of sewers to carry combined flow, is? |
| A. | Circular |
| B. | Egg shaped |
| C. | Rectangular |
| D. | Horse shoe shaped |
| Answer» C. Rectangular | |
| 222. |
In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is? |
| A. | D/1 |
| B. | D/2 |
| C. | D/3 |
| D. | D/4 |
| Answer» E. | |
| 223. |
5 days-biochemical oxygen demand (BOD5) is taken at a temperature of? |
| A. | 0°C |
| B. | 15°C |
| C. | 20°C |
| D. | 25°C |
| Answer» D. 25¬¨‚àûC | |
| 224. |
1000 kg of sewage contains? |
| A. | 0.112 kg in suspension |
| B. | 0.112 kg in solution |
| C. | 0.225 kg in solution |
| D. | Both A and C of above |
| Answer» E. | |
| 225. |
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 | |
| 226. |
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 | |
| 227. |
The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is? |
| A. | 0.68 m |
| B. | 0.88 m |
| C. | 1.36 m |
| D. | 1.76 m |
| Answer» D. 1.76 m | |
| 228. |
Pick up the correct statement from the following:? |
| A. | Indore method of composting involves decomposition under aerobic conditions |
| B. | Bangalore method of composting involves decomposing under anaerobic conditions |
| C. | Fully stabilised refuse by the Bangalore method of compositing is a powdery mass called humus |
| D. | all of these |
| Answer» E. | |
| 229. |
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 | |
| 230. |
The spacing of bars for perforations in coarse screens used for the treatment of sewage, is |
| A. | 20 mm |
| B. | 30 mm |
| C. | 40 mm |
| D. | 50 mm |
| Answer» E. | |
| 231. |
Lead caulked joints are used for laying |
| A. | Stone ware pipes |
| B. | Earthenware pipes |
| C. | C.I. pipes |
| D. | G.I. pipes |
| Answer» C. C.I. pipes | |
| 232. |
For a continuous flow type of sedimentation tanks |
| A. | Width of the tank is normally kept about 6 m |
| B. | Length of the tank is normally kept 4 to 5 times the width |
| C. | Maximum horizontal flow velocity is limited to 0.3 m/minute |
| D. | All the above |
| Answer» E. | |
| 233. |
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 | |
| 234. |
In a sludge digestion tank if the moisture content of sludge V1 litres is reduced from p1 % to p2 % the volume V2 is |
| A. | [(100 + P1)/(100 – P2)] V1 |
| B. | [(100 – P1)/(100 + P2)] V1 |
| C. | [(100 – P1)/(100 – P2)] V1 |
| D. | [(100 + P2)/(100 – P1)] V1 |
| Answer» D. [(100 + P2)/(100 ‚Äö√Ñ√¨ P1)] V1 | |
| 235. |
The porosity of sediments in sewer pipes, is usually taken as |
| A. | 0.010 |
| B. | 0.011 |
| C. | 0.012 |
| D. | 0.013 |
| Answer» E. | |
| 236. |
15 cumecs, the depth d and width are related by For drains up to |
| A. | d = 0.2 B |
| B. | d = 0.5 B |
| C. | B = 0.2 d |
| D. | B = 0.5 d |
| Answer» C. B = 0.2 d | |
| 237. |
In case of Imhoff tanks, |
| A. | The shape is rectangular |
| B. | Detention period is 2 hours |
| C. | The velocity of flow is restricted to 0.30 m/minute |
| D. | All the above |
| Answer» E. | |
| 238. |
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‚Äö√Ñ√¥ = 0.94 D | |
| 239. |
The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is |
| A. | 0.10 cumec |
| B. | 0.12 cumec |
| C. | 0.15 cumec |
| D. | 0.20 cumec |
| Answer» D. 0.20 cumec | |
| 240. |
Which one of the following gases is most significant as air pollutant? |
| A. | Carbondioxide |
| B. | Oxygen |
| C. | Nitrogen |
| D. | Sulphur-dioxide |
| Answer» E. | |
| 241. |
In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is |
| A. | Q/(B √ó D) |
| B. | Q/(L √ó D) |
| C. | Q/L |
| D. | Q/(B √ó L) |
| Answer» E. | |
| 242. |
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 | |
| 243. |
The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is$ |
| A. | 213.5 cm/sec |
| B. | 313.5 cm/sec |
| C. | 413.5 cm/sec |
| D. | 500 cm/sec |
| Answer» C. 413.5 cm/sec | |
| 244. |
Which one of the following tests is used for testing sewer pipes? |
| A. | Water test |
| B. | Ball test |
| C. | Mirror test |
| D. | All of these |
| Answer» E. | |
| 245. |
Boussinesq’s equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is$ |
| A. | pt = 3H3p/2 Z5 |
| B. | pt = 2H3p/3 Z5 |
| C. | pt = 3H3p/2 Z5 |
| D. | pt = 2H3p/3 Z5 |
| Answer» B. pt = 2H3p/3 Z5 | |
| 246. |
¾th or ¼th extra space is left in sewer pipes at maximum discharge for# |
| A. | Low estimates of the average and maximum flows |
| B. | Large scale infiltration of storm water |
| C. | Unexpected increase in population |
| D. | All the above |
| Answer» E. | |
| 247. |
Which one of the following resists hydrogen sulphide corrosion? |
| A. | R.C.C. |
| B. | Glazed stone wares |
| C. | Asbestos cement |
| D. | Glazed ware |
| Answer» E. | |
| 248. |
‘Cowl’ is provided at# |
| A. | Lower end of ventilating column |
| B. | Upper end of ventilating column |
| C. | Upper end of the manhole |
| D. | First step in manhole |
| Answer» C. Upper end of the manhole | |
| 249. |
The grit chambers of sewage treatment plants, are generally cleaned after |
| A. | 2 days |
| B. | 7 days |
| C. | 12 days |
| D. | 14 days |
| Answer» E. | |
| 250. |
In a sludge tank, the gas mainly produced, is |
| A. | Oxygen |
| B. | Nitrogen |
| C. | Hydrogen |
| D. | Carbon dioxide |
| Answer» E. | |