McqMate
| 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 | |
| 251. |
A sewer which receives sewage from the collection system and conducts it to a point of final disposal is called a |
| A. | common sewer |
| B. | trunk sewer |
| C. | branch sewer |
| D. | outfall sewer |
| Answer» D. outfall sewer | |
| 252. |
The effective size of sand particles for rapid sand filters varies from |
| A. | 0.30 to 0.35 mm |
| B. | 0.35 to 0.50 mm |
| C. | 0.50 to 0.65 mm |
| D. | 0.65 to 0.75 mm |
| Answer» B. 0.35 to 0.50 mm | |
| 253. |
Which of the following statement is correct? |
| A. | Sewage, if not treated, will create healthy conditions. |
| B. | Secondary treatment of sewage works on hydraulic separation principle. |
| C. | Primary clarifiers are to the sedimentation tanks located just after the girt chambers. |
| D. | Trickling filter is different from percolating filter. |
| Answer» C. Primary clarifiers are to the sedimentation tanks located just after the girt chambers. | |
| 254. |
In India, as per Indian standards, water consumption per capita per day for domestic purpose is |
| A. | 85 litres |
| B. | 100 litres |
| C. | 115 litres |
| D. | 135 litres |
| Answer» D. 135 litres | |
| 255. |
Bacteria which can survive with or without free oxygen is known as facultative bacteria. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 256. |
The minimum size of a fire hydrant is |
| A. | 5 cm |
| B. | 10 cm |
| C. | 15 cm |
| D. | 20 cm |
| Answer» C. 15 cm | |
| 257. |
The treatment of water with only chlorine is known as |
| A. | plain chlorination |
| B. | post cholorination |
| C. | pre-chlorination |
| D. | de-chlorination |
| Answer» A. plain chlorination | |
| 258. |
The under drainage system in a rapid sand filters |
| A. | receives and collects the filtered water |
| B. | allows back washing for cleaning the filter |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» C. both (a) and (b) | |
| 259. |
The under drainage system in slow sand filters |
| A. | receives and collects the filtered water |
| B. | allows back washing for cleaning the filter |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» A. receives and collects the filtered water | |
| 260. |
The storm sewers are essentially required to |
| A. | avoid creation of unfavourable healthy conditions |
| B. | improve the general appearance of the city |
| C. | dispose off the first washings of early showers as quickly as possible |
| D. | all of the above |
| Answer» D. all of the above | |
| 261. |
In a rapid sand filter |
| A. | raw water from the source is supplied |
| B. | disinfected raw water is supplied |
| C. | raw water passed through coagulation tank is supplied |
| D. | any one of the above |
| Answer» C. raw water passed through coagulation tank is supplied | |
| 262. |
In primary settling tank, suspended solids are reduced from |
| A. | 10 to 20% |
| B. | 20 to 40% |
| C. | 40 to 70% |
| D. | 70 to 90% |
| Answer» C. 40 to 70% | |
| 263. |
The domestic use of water amounts to |
| A. | 20% |
| B. | 30% |
| C. | 40% |
| D. | 50% |
| Answer» D. 50% | |
| 264. |
A combined system will be favourable when |
| A. | the sewers are to be laid in rocks |
| B. | the finances are limited |
| C. | the topography is flat necessitating deep excavation for combined sewers |
| D. | the locality to be served has narrow streets |
| Answer» D. the locality to be served has narrow streets | |
| 265. |
The presence of carbon dioxide in water causes acidity. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 266. |
The maximum permissible temperature for domestic supply is |
| A. | 5 to 10?C |
| B. | 10 to 15?C |
| C. | 15 to 20?C |
| D. | 20 to 25?C |
| Answer» B. 10 to 15?C | |
| 267. |
Which of the following is not a coagulating agent? |
| A. | Ferric sulphate |
| B. | Ferric chloride |
| C. | Aluminium sulphate |
| D. | Copper sulphate |
| Answer» D. Copper sulphate | |
| 268. |
The bio-chemical treatment of sewage effluent is a process of |
| A. | oxidation |
| B. | deoxidation |
| C. | self purification |
| D. | sedimentation |
| Answer» A. oxidation | |
| 269. |
The design period for a water supply project is taken as |
| A. | 5 to 10 years |
| B. | 10 to 15 years |
| C. | 15 to 20 years |
| D. | 20 to 30 years |
| Answer» D. 20 to 30 years | |
| 270. |
Which of the following statement is correct? |
| A. | Pre-chlorination reduces the bacterial load on filters. |
| B. | The substance used for disinfection of water is known as coagulant. |
| C. | Chlorine cannot be applied in the form of chloramines. |
| D. | all of the above |
| Answer» A. Pre-chlorination reduces the bacterial load on filters. | |
| 271. |
The bacterias which do not cause any disease are called pathogenic bacterias. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 272. |
In order to prevent water to flow back in opposite direction, we shall use a |
| A. | scour valve |
| B. | air valve |
| C. | gate valve |
| D. | reflux valve |
| Answer» D. reflux valve | |
| 273. |
A reflux valve is also known as |
| A. | safety valve |
| B. | scour valve |
| C. | air valve |
| D. | check valve |
| Answer» D. check valve | |
| 274. |
The effluents from the septic tank are discharged into |
| A. | soak pit |
| B. | drainage |
| C. | oxidation pond |
| D. | sewer |
| Answer» A. soak pit | |
| 275. |
Which of the following statement is wrong? |
| A. | The water closets should be such that excreta do not stick to it |
| B. | The trap prevents the entry of foul gases. |
| C. | The trap should have self cleaning velocity |
| D. | The water closet is provided for receiving garbage. |
| Answer» D. The water closet is provided for receiving garbage. | |
| 276. |
Zeolite process is also known as |
| A. | base exchange process |
| B. | Cation exchange process |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» C. both (a) and (b) | |
| 277. |
The privy pit should be located at least |
| A. | 3 m |
| B. | 10 m |
| C. | 30 m |
| D. | 50 m |
| Answer» A. 3 m | |
| 278. |
The most common coagulant is |
| A. | magnesium sulphate |
| B. | alum |
| C. | chlorine |
| D. | bleaching powder |
| Answer» B. alum | |
| 279. |
A pipe conveying sewage from the plumbing system of a singe building to a common sewer or to the point of immediate disposal is called |
| A. | common sewer |
| B. | house sewer |
| C. | lateral sewer |
| D. | outfall sewer |
| Answer» B. house sewer | |
| 280. |
The process of adding certain chemicals to water in order to form flocculent precipitate for absorbing and entraining colloidal mater is called sedimentation with coagulation. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 281. |
The particle will settle down more rapidly in water at high temperatures than at lower temperatures. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 282. |
For a well planned city, we whall use the grid iron system for the distribution of pipes. |
| A. | Right |
| B. | Wrong |
| Answer» A. Right | |
| 283. |
Which of the following statement is wrong? |
| A. | A check valve is provided on the delivery side in between the pump and the gate valve. |
| B. | A pressure relief and air valve are provided on the delivery side. |
| C. | Scour valves are provided at high points |
| D. | all of the above |
| Answer» C. Scour valves are provided at high points | |
| 284. |
In a plain sedimentation tank, under normal conditions, impurities are removed upto |
| A. | 50% |
| B. | 60% |
| C. | 70% |
| D. | 80% |
| Answer» C. 70% | |
| 285. |
The colour of water is expressed in numbers of a |
| A. | silica scale |
| B. | platinum cobalt scale |
| C. | pO value |
| D. | none of these |
| Answer» B. platinum cobalt scale | |
| 286. |
Cess pool is not recommended by the health authorities. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 287. |
The percentage of chlorine in fresh bleaching powder is |
| A. | 20 to 25% |
| B. | 25 to 30% |
| C. | 30 to 35% |
| D. | 35 to 40% |
| Answer» C. 30 to 35% | |
| 288. |
The amount of chlorine used for plain chlorination of water is about |
| A. | 0.2 ppm |
| B. | 0.3 ppm |
| C. | 0.4 ppm |
| D. | 0.5 ppm |
| Answer» D. 0.5 ppm | |
| 289. |
The maximum acidity in water will occur at a pH value of |
| A. | 0 |
| B. | 2 |
| C. | 7 |
| D. | 14 |
| Answer» A. 0 | |
| 290. |
The corrosion in pipe is due to |
| A. | dissolved oxygen in water |
| B. | pH value of water |
| C. | impurities in the material particularly those having a lower potential |
| D. | all of the above |
| Answer» D. all of the above | |
| 291. |
The method in which different types of refuse are collected, carried and disposed off separately is called |
| A. | conservancy method |
| B. | dry method |
| C. | water carriage method |
| D. | either (a) and (b) |
| Answer» D. either (a) and (b) | |
| 292. |
Membrane filter technique is used for testing |
| A. | E-coli |
| B. | copper |
| C. | pathogenic bacterias |
| D. | none of these |
| Answer» A. E-coli | |
| 293. |
The commercial osmoscope is graduated with pO values from |
| A. | 0 to 5 |
| B. | 5 to 10 |
| C. | 10 to 15 |
| D. | 15 to 20 |
| Answer» A. 0 to 5 | |
| 294. |
The sanitation system in which a small portion of storm water is allowed to enter in the sanitary sewage sewers and the remaining storm water flows in separate set of sewers, is known as |
| A. | separate system |
| B. | combined system |
| C. | partially separate system |
| D. | partially combined system |
| Answer» C. partially separate system | |
| 295. |
The effective size of sand particles for slow sand filters varies from |
| A. | 0.30 to 0.35 mm |
| B. | 0.35 to 0.50 mm |
| C. | 0.50 to 0.65 mm |
| D. | 0.65 to 0.75 mm |
| Answer» A. 0.30 to 0.35 mm | |
| 296. |
The process of purifying water by passing it through a bed of fine granular material, is called |
| A. | screening |
| B. | filteration |
| C. | coagulation |
| D. | sedimentation |
| Answer» B. filteration | |
| 297. |
In one pipe system of plumbing, |
| A. | only one pipe is provided |
| B. | the main pipe is connected directly to the drainage system |
| C. | all of the traps are fully ventilated and connected to the ventilation pipe |
| D. | all of the above |
| Answer» D. all of the above | |
| 298. |
The water of a river has an important property called |
| A. | turbidity |
| B. | self purification |
| C. | permeability |
| D. | infiltration capacity |
| Answer» B. self purification | |
| 299. |
Suspended impurities include |
| A. | algae |
| B. | protozoa |
| C. | fungi |
| D. | all of these |
| Answer» D. all of these | |
| 300. |
The anti-siphonage pipe is not required in |
| A. | one pipe system |
| B. | two pipe system |
| C. | single stack system |
| D. | none of these |
| Answer» C. single stack system | |
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