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. |
Turbidity of raw water is a measure of |
| A. | suspended solids |
| B. | acidity of water |
| C. | B.O.D. |
| D. | none of these. |
| Answer» B. acidity of water | |
| 202. |
The difference in the reservoir level and the lowest point of the water mains is 180 m. The expected pressure due to water hammer is 7.5 kg/cm2 in a pressure conduit of diameter 1 m. Assuming the efficiency of the riveted joints of the pipe as 0.6 and minimum cover 3 mm for corrosion, the thickness of the pipe materials, is |
| A. | 10 mm |
| B. | 15 mm |
| C. | 20 mm |
| D. | 25 mm |
| Answer» D. 25 mm | |
| 203. |
Gravity conduits |
| A. | carry water under gravity |
| B. | follow the hydraulic gradient line |
| C. | are carried on trestles in valleys and depressions |
| D. | are carried through tunnels in deep cuttings |
| Answer» E. | |
| 204. |
For determining the velocity of flow of underground water, the most commonly used non-empirical formula is |
| A. | Darcy's formula |
| B. | Slichter's formula |
| C. | Hazen's formula |
| D. | Lacy's formula. |
| Answer» B. Slichter's formula | |
| 205. |
Pick up the correct statement from the following regarding the pressure conduits : |
| A. | Pressure conduits are permitted to run th full |
| B. | Pressure conduits are always laid along down grades |
| C. | The hydraulic gradient line always coincides the invert of the conduit |
| D. | None of these. |
| Answer» E. | |
| 206. |
If pH value of water is |
| A. | 7 water it is said to be neutral |
| B. | less than 7 it is said to be acidic |
| C. | more than 7 it is said to be alkaline |
| D. | all the above. |
| Answer» E. | |
| 207. |
In pressure supply mains, water hammer pressure is reduced by providing |
| A. | sluice valves |
| B. | air valves |
| C. | pressure relief valves |
| D. | none of the these. |
| Answer» D. none of the these. | |
| 208. |
Percussion drilling is unsuitable in |
| A. | unconsolidated sand |
| B. | unconsolidated gravel |
| C. | quick sand |
| D. | consolidated rocks. |
| Answer» E. | |
| 209. |
Pick up the incorrect statement from the following. The source of surface water is from |
| A. | streams and rivers |
| B. | storage reservoirs |
| C. | springs |
| D. | ponds and lakes |
| Answer» D. ponds and lakes | |
| 210. |
During treatment of water, sedimentation is done |
| A. | before filtration |
| B. | after filtration |
| C. | simultaneously with filtration |
| D. | along with chlorination. |
| Answer» B. after filtration | |
| 211. |
Pick up the incorrect statement from the following. The underground sources of water, is from |
| A. | wells |
| B. | springs |
| C. | infiltration wells |
| D. | storage reservoirs |
| Answer» E. | |
| 212. |
By boiling water, hardness can be removed if it is due to |
| A. | calcium sulphate |
| B. | magnesium sulphate |
| C. | calcium nitrate |
| D. | calcium bicarbonate |
| Answer» E. | |
| 213. |
Asbestos pipes are joined by means of |
| A. | flanged joint |
| B. | flexible joint |
| C. | dresser coupling joint |
| D. | simplex joint |
| Answer» E. | |
| 214. |
The coefficient of permeability of soils, is generally expressed in |
| A. | cm/sec |
| B. | cm/minute |
| C. | cm2/sec |
| D. | cm2/minute. |
| Answer» B. cm/minute | |
| 215. |
Most commonly used section in grade aqueducts, is |
| A. | circular |
| B. | rectangular |
| C. | parabolic |
| D. | horse shoe section. |
| Answer» C. parabolic | |
| 216. |
The storage capacity of a reservoir may be divided into three zones. The lowest zone is |
| A. | Dead storage |
| B. | Useful storage |
| C. | Surcharge storage |
| D. | None of these. |
| Answer» B. Useful storage | |
| 217. |
A high velocity of wash water is required for |
| A. | rapid gravity filter with strainers |
| B. | rapid gravity filter without strainers |
| C. | slow sand filter with strainers |
| D. | slow sand filter without strainers |
| Answer» C. slow sand filter with strainers | |
| 218. |
For plain chlorination of water, the quantity of chlorine used, is |
| A. | 0.1 mg/litre |
| B. | 0.2 mg/litre |
| C. | 0.3 mg/litre |
| D. | 0.4 mg/litre |
| Answer» E. | |
| 219. |
The maximum permissible colour for domestic supplies based on cobalt scale, is |
| A. | 5 ppm |
| B. | 10 ppm |
| C. | 15 ppm |
| D. | 20 ppm |
| Answer» E. | |
| 220. |
If the average daily demand of a city of 50, 000 population, is 20 m.l.d., the maximum daily demand is |
| A. | 24 mld |
| B. | 30 mld |
| C. | 36 mld |
| D. | 54 mld. |
| Answer» D. 54 mld. | |
| 221. |
The standard B.O.D. at 20&Deg;C, is taken for the consumption in |
| A. | one day |
| B. | 2 days |
| C. | 3 days |
| D. | 4 days |
| Answer» E. | |
| 222. |
In distribution pipes, drain valves are provided at |
| A. | lower point |
| B. | higher point |
| C. | junction points |
| D. | any where. |
| Answer» B. higher point | |
| 223. |
An ideal sand for filters should be |
| A. | free from dirt and other impurities |
| B. | uniform in nature and size |
| C. | hard and resistant |
| D. | all the above. |
| Answer» E. | |
| 224. |
Normal values of overflow rate for plain sedimentation tank using coagulants, is |
| A. | 750 to 1000 litres/hr/m2 |
| B. | 1000 to 1250 litres/hr/m2 |
| C. | 1250 to 1500 litres/hr/m2 |
| D. | 1500 litres/hr/m2. |
| Answer» C. 1250 to 1500 litres/hr/m2 | |
| 225. |
A pressure conduit carrying water beneath a stream or a canal, is known as |
| A. | sag |
| B. | depressed pipe |
| C. | inverted syphon |
| D. | all the above. |
| Answer» E. | |
| 226. |
Rapid sand filter |
| A. | should be preceeded by coagulation and sedimentation |
| B. | uses rapid sand as filter media |
| C. | is used after slow sand filtering has been done |
| D. | can combine disinfection also. |
| Answer» B. uses rapid sand as filter media | |
| 227. |
The expected discharge to be obtained from an open well sunk in coarse sand is 0.0059 cumec. If the working depression head of the well is 3 m, the minimum diameter of the well, is |
| A. | 2 m |
| B. | 2.25 m |
| C. | 2.50 m |
| D. | 2.75 m |
| Answer» E. | |
| 228. |
Water losses in water supply, is assumed as |
| A. | 0.05 |
| B. | 0.075 |
| C. | 0.1 |
| D. | 0.225 |
| Answer» E. | |
| 229. |
Time of concentration |
| A. | is the time taken, for precipitation |
| B. | duration of rainfall. |
| C. | time taken for all the ran off to reach the drain |
| D. | time taken for the storm water to travel from the most remote point to the drain. |
| Answer» E. | |
| 230. |
The specific retention is least in case of |
| A. | Clay |
| B. | Sand |
| C. | Silt |
| D. | Coarse gravel. |
| Answer» E. | |
| 231. |
The maximum pressure to which cast iron pipes may be subjected to, is |
| A. | 3 kg/cm2 |
| B. | 5 kg/cm2 |
| C. | 7 kg/cm2 |
| D. | 10 kg/cm2. |
| Answer» D. 10 kg/cm2. | |
| 232. |
Most satisfactory formula for an estimate of fire demand Q for a city of population P in thousands for Indian conditions, is |
| A. | |
| B. | Q = 1640 P (1 - 0.01 P) |
| C. | Q = 3180 P |
| Answer» D. | |
| 233. |
A centrifugal pump is required to be primed before starting if it is located |
| A. | at higher level than water level of reservoir |
| B. | at lower level than water level of reservoir |
| C. | both (a) and (b) |
| D. | neither (a) nor (b). |
| Answer» B. at lower level than water level of reservoir | |
| 234. |
Per capita demand of water is calculated in litres |
| A. | per person per day |
| B. | per person per month |
| C. | per person per year |
| D. | none of these. |
| Answer» B. per person per month | |
| 235. |
At the socket and spigot joint, |
| A. | enlarged end of the pipe is called socket |
| B. | normal end of the pipe is called spigot |
| C. | spigot is fitted into the socket |
| D. | molten lead is used for water proofing |
| Answer» E. | |
| 236. |
According to IS : 1172-1963, a minimum of 135 litres of water capita per day, is required for |
| A. | Boarding schools |
| B. | Nurses home and medical quarters |
| C. | hostels |
| D. | all the above. |
| Answer» E. | |
| 237. |
In distribution pipes, air valves are provided at |
| A. | lower points |
| B. | junction points |
| C. | higher points |
| D. | any where. |
| Answer» D. any where. | |
| 238. |
Water supply system includes |
| A. | digging a well for water |
| B. | construction of dams |
| C. | construction of canals |
| D. | entire arrangement from source to distribution. |
| Answer» E. | |
| 239. |
Pick up the incorrect statement from the following. In take of water supply should |
| A. | be nearer to the treatment plant |
| B. | receive water from purer zone of the source |
| C. | be located downstream of waste water disposal point |
| D. | remain easily accessible during floods. |
| Answer» D. remain easily accessible during floods. | |
| 240. |
Water to the consumers may be supplied from |
| A. | infiltration galleries connected to sump well |
| B. | infiltration well dug out on the banks of rivers |
| C. | ranney wells sunk to the water level |
| D. | all the above. |
| Answer» E. | |
| 241. |
Average annual rainfall at any station is the average of annual rainfall over a period of |
| A. | 7 years |
| B. | 14 years |
| C. | 21 years |
| D. | 28 years |
| Answer» E. | |
| 242. |
The transitional middle portion of a logistic curve follows |
| A. | a geometric growth |
| B. | a logarithmic growth |
| C. | a first over curve |
| D. | a constant rate. |
| Answer» E. | |
| 243. |
Manholes along the mains from the source to a city are provided at 500 m intervals in |
| A. | steel pipes |
| B. | R.C.C. pipes |
| C. | hume steel pipes |
| D. | all the above. |
| Answer» E. | |
| 244. |
Manholes are less common in |
| A. | cast iron pipes |
| B. | steel pipes |
| C. | hume steel pipes |
| D. | R.C.C. pipes. |
| Answer» B. steel pipes | |
| 245. |
Capacity of soil to absorb moisture, is generally known as |
| A. | permeability |
| B. | porosity |
| C. | infiltration capacity |
| D. | perviousness. |
| Answer» D. perviousness. | |
| 246. |
According to Kuichling's formula, fire demand in litres per minute for a population of P thousands, is |
| A. | 3182 P |
| B. | |
| C. | 4637 P [1 - 0.01 P] |
| Answer» B. | |
| 247. |
Disinfection of drinking water, is done to remove |
| A. | odour |
| B. | bacterias |
| C. | turbidity |
| D. | colour. |
| Answer» C. turbidity | |
| 248. |
As per IS : 1172-1963, water required per head per day for average domestic purposes, is |
| A. | 50 litres |
| B. | 65 litres |
| C. | 85 litres |
| D. | 105 litres |
| Answer» E. | |
| 249. |
The most commonly used chemical for dechlorination of water, is |
| A. | sodium thiosulphate |
| B. | sodium bisulphate |
| C. | sodium sulphite |
| D. | sulphur-dioxide |
| Answer» D. sulphur-dioxide | |
| 250. |
The most ideal disinfectant used for drinking water throughout the world, is |
| A. | alum |
| B. | lime |
| C. | chlorine |
| D. | nitrogen |
| Answer» D. nitrogen | |