McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 201. |
Sludge treatment is mainly done in order to |
| A. | stablize the organic matter |
| B. | destroy the pathogenic bacterias |
| C. | reduce the water content |
| D. | all of these |
| Answer» D. all of these | |
| 202. |
The total count of bacteria per cubic centimetre for domestic purposes varies from |
| A. | 0 to 100 |
| B. | 100 to 150 |
| C. | 150 to 200 |
| D. | 200 to 250 |
| Answer» A. 0 to 100 | |
| 203. |
The internal diameter of the sewer should not be less than |
| A. | 15 cm |
| B. | 25 cm |
| C. | 50 cm |
| D. | 75 cm |
| Answer» A. 15 cm | |
| 204. |
The minimum dissolved oxygen required in water to save the aquatic life is |
| A. | 1 ppm |
| B. | 2 ppm |
| C. | 4 ppm |
| D. | 8 ppm |
| Answer» C. 4 ppm | |
| 205. |
Which of the following statement is wrong? |
| A. | For land disposal, large areas with preferably sandy types of soil are required. |
| B. | The land disposal requires either preliminary or primary treatment of sewage. |
| C. | The land disposal saves the inland stream from getting polluted by sewage. |
| D. | none of the above |
| Answer» D. none of the above | |
| 206. |
B-coli or E-coli are harmless organisms but their presence in water indicates the |
| A. | presence of pathogenic bacteria |
| B. | absence of pathogenic bacteria |
| C. | presence of non-pathogenic bacteria |
| D. | absence of non-pathogenic bacteria |
| Answer» A. presence of pathogenic bacteria | |
| 207. |
In combined system, automatic flushing is not possible. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 208. |
The copper contents in water for domestic purposes should not be |
| A. | less than |
| B. | more than |
| Answer» B. more than | |
| 209. |
The maximum permissible quantity of iron and manganese in water for domestic purposes should be |
| A. | 0.1 ppm |
| B. | 0.3 ppm |
| C. | 0.6 ppm |
| D. | 0.8 ppm |
| Answer» B. 0.3 ppm | |
| 210. |
The maximum permissible fluorine content in water for domestic supplies should be |
| A. | 0.15 ppm |
| B. | 1.5 ppm |
| C. | 15 ppm |
| D. | 150 ppm |
| Answer» B. 1.5 ppm | |
| 211. |
When high level spots are not available for the construction of ground level reservoirs, elevated reservoirs can be used. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 212. |
The capacity of the pumps is normally expressed as |
| A. | litres per minute |
| B. | cubic metres per day |
| C. | thousands of litres per hour |
| D. | all of these |
| Answer» D. all of these | |
| 213. |
In presure filters, water is forced at a pressure |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» C. greater than | |
| 214. |
No deposition will take place in |
| A. | larger |
| B. | smaller |
| Answer» B. smaller | |
| 215. |
The volume of a settling basin is large due to |
| A. | large volumes of floc added for coagulation |
| B. | large amount of water entrapped into it |
| C. | greater amount of suspended solids to be removed |
| D. | none of the above |
| Answer» D. none of the above | |
| 216. |
The main object of sewage disposal is |
| A. | to dispose off properly human excreta to a safe place before its creates unhealthy conditions in the locality |
| B. | to dispose off waste water from an area so that it may not become breeding place for mosquitoes |
| C. | to dispose off the sewage after giving it treatment so that the receiving land may not get polluted |
| D. | all of the above |
| Answer» D. all of the above | |
| 217. |
For building drainage pipes, a smoke test is applied. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 218. |
The maximum permissible colour for domestic supplies, on platinum cobalt scale is |
| A. | 5 to 10 ppm |
| B. | 10 to 20 ppm |
| C. | 20 to 30 ppm |
| D. | 30 to 40 ppm |
| Answer» B. 10 to 20 ppm | |
| 219. |
The maximum permissible turbidity for domestic supplies, on silica scale is |
| A. | 5 to 10 ppm |
| B. | 10 to 20 ppm |
| C. | 20 to 30 ppm |
| D. | 30 to 40 ppm |
| Answer» A. 5 to 10 ppm | |
| 220. |
The rate of settling of a particle in water depends upon the |
| A. | viscosity of water |
| B. | density of water |
| C. | specific gravity of particle |
| D. | all of these |
| Answer» D. all of these | |
| 221. |
The quantity of water available from an infiltration gallery depends upon the |
| A. | size of gallery |
| B. | nature of soil |
| C. | yield of source |
| D. | all of these |
| Answer» D. all of these | |
| 222. |
The treatment which employs mechanical and hydraulic separation principles is referred as secondary treatment. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 223. |
A good trap should |
| A. | not have self cleaning property |
| B. | restrict the flow of water |
| C. | provide an adequate water seal at all times |
| D. | all of these |
| Answer» C. provide an adequate water seal at all times | |
| 224. |
The organic impurities in water form a layer on the top of a filtering media. Such a layer is called |
| A. | permeable layer |
| B. | filtering layer |
| C. | dirty skin |
| D. | none of these |
| Answer» C. dirty skin | |
| 225. |
In one pipe system of plumbing, waste water is carried away from |
| A. | bath rooms |
| B. | kitchens |
| C. | wash basins |
| D. | all of these |
| Answer» D. all of these | |
| 226. |
In designing a water works for a city to meet the water demand for public use, a provision of about |
| A. | 5% |
| B. | 10% |
| C. | 20% |
| D. | 25% |
| Answer» B. 10% | |
| 227. |
A pipe used to carry discharge from sanitary fittings like bathrooms, kitchens etc, is called |
| A. | waste pipe |
| B. | soil pipe |
| C. | vent pipe |
| D. | anti-siphonage pipe |
| Answer» A. waste pipe | |
| 228. |
When the pH value of water is |
| A. | equal to 7 |
| B. | less than 7 |
| C. | more than 7 |
| Answer» B. less than 7 | |
| 229. |
The equipment used for checking the levels of the sewer inverts is |
| A. | dumpy level |
| B. | theodolite |
| C. | boning rod |
| D. | all of these |
| Answer» C. boning rod | |
| 230. |
The pH value of water for public supplies is limited from |
| A. | 2.5 to 6.5 |
| B. | 6.5 to 8 |
| C. | 8 to 10.5 |
| D. | 10.5 to 15 |
| Answer» B. 6.5 to 8 | |
| 231. |
The yield of a underground source may be obtained by |
| A. | pumping test |
| B. | recupating test |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» C. both (a) and (b) | |
| 232. |
The coefficient of uniformity for rapid sand filters is |
| A. | more |
| B. | less |
| Answer» B. less | |
| 233. |
For house drainage and lateral connections, we shall use |
| A. | stone ware sewers |
| B. | cast iron sewers |
| C. | concrete sewers |
| D. | masonry sewers |
| Answer» A. stone ware sewers | |
| 234. |
The cross-section recommended for separate system of sewerage is |
| A. | circular |
| B. | egg-shaped |
| C. | rectangular |
| D. | none of these |
| Answer» C. rectangular | |
| 235. |
In the design of a sedimentation tank, the essential factor to be considered is |
| A. | period of detention |
| B. | sludge capacity |
| C. | velocity of flow |
| D. | all of these |
| Answer» D. all of these | |
| 236. |
House plumbing is difficult in |
| A. | separate |
| B. | combined |
| Answer» A. separate | |
| 237. |
pH value is a symbol for |
| A. | magnesium |
| B. | hydrogen |
| C. | calcium |
| D. | sodium |
| Answer» B. hydrogen | |
| 238. |
The quantity of arsenic in water for domestic purposes should not be more than 0.05 ppm. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 239. |
After cleaning the slow sand filter, the filtered water should not be used for a period of |
| A. | upto 6 hours |
| B. | 6 hours to 12 hours |
| C. | 12 hours to 24 hours |
| D. | 24 hours to 48 hours |
| Answer» D. 24 hours to 48 hours | |
| 240. |
By lime soda process, hardness can be reduced to less than |
| A. | 50 ppm |
| B. | 75 ppm |
| C. | 100 ppm |
| D. | 150 ppm |
| Answer» A. 50 ppm | |
| 241. |
In pre-chlorination, the raw water is treated with chlorine only. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 242. |
Aluminium sulphate may be used for coagulation. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 243. |
Disposal by dilution will be suitable where |
| A. | there are strong forward currents |
| B. | there is no back currents |
| C. | the sewage arriving at the out fall point is fresh and non-septic |
| D. | all of the above |
| Answer» D. all of the above | |
| 244. |
Cleaning period for a slow sand filter is taken as |
| A. | 1 hour to 3 hours |
| B. | 1 day to 3 days |
| C. | 1 week to 3 weeks |
| D. | 1 month to 3 months |
| Answer» D. 1 month to 3 months | |
| 245. |
The open wells or dug wells wells |
| A. | act as a small storage reservoir |
| B. | are suitable for a small discharge |
| C. | are cheap in construction |
| D. | all of these |
| Answer» D. all of these | |
| 246. |
In Zeolite process |
| A. | no sludge is formed |
| B. | water of varying quality can be treated |
| C. | ferrous and manganese from water are removed |
| D. | all of tha above |
| Answer» D. all of tha above | |
| 247. |
Hard water may cause bursting of boilers. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 248. |
The amount of water collected in a reservoir is divided into three portions and the order of their existance from bottom to the top is |
| A. | useful storage, surcharge storage, dead storage |
| B. | useful storage, dead storage, surcharge storage |
| C. | dead storage, useful storage, surcharge storage |
| D. | none of the above |
| Answer» C. dead storage, useful storage, surcharge storage | |
| 249. |
The permanent hardness of water can be removed by |
| A. | adding alum |
| B. | adding chlorine |
| C. | boiling |
| D. | zeolite process |
| Answer» D. zeolite process | |
| 250. |
Coagulation is required when the particles are of |
| A. | fine |
| B. | coarse |
| Answer» A. fine | |
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