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.
| 151. |
The flow of water gets retarded, in |
| A. | settling tank |
| B. | sedimentation tank |
| C. | clarifer |
| D. | sedimentation basin |
| Answer» E. | |
| 152. |
E. Coli bacterias die in water having pH greater than |
| A. | 5.5 |
| B. | 6.5 |
| C. | 7.5 |
| D. | 8.5 |
| Answer» E. | |
| 153. |
The permissible pH value for public water supplies may range between |
| A. | 4.5 to 5.5 |
| B. | 5.5 to 6.5 |
| C. | 6.5 to 8.5 |
| D. | 8.5 to 10.5 |
| Answer» D. 8.5 to 10.5 | |
| 154. |
Property of earth to allow water to pass through it, is known as |
| A. | perviousness |
| B. | porosity |
| C. | permeability |
| D. | transmissibility. |
| Answer» B. porosity | |
| 155. |
Pressure relief valves are provided in water mains |
| A. | to reduce the pressure |
| B. | at low points |
| C. | upstream of sluice |
| D. | all the above. |
| Answer» E. | |
| 156. |
The pH value of water fit for drinking, is |
| A. | 13 |
| B. | 11 |
| C. | 9 |
| D. | 7 |
| Answer» E. | |
| 157. |
If discharge of a pump is 0.16 cumecs, the economic diameter of pipe, is |
| A. | 0.488 m |
| B. | 4.88 cm |
| C. | 48.8 cm |
| D. | 4.88 m |
| Answer» B. 4.88 cm | |
| 158. |
Rapid gravity filters can remove bacterial impurities up to a maximum of |
| A. | 0.5 |
| B. | 0.6 |
| C. | 0.7 |
| D. | 0.8 |
| Answer» E. | |
| 159. |
The external load per unit length of |
| A. | a pipe laid on, or projecting above the undisturbed ground and covered with fills, is proportional to the square of the external diameter of the pipe |
| B. | a flexible pipe burried in narrow trenches and thoroughly compacted side fills, is proportional to the product of the width of the trench and diameter of the pipe |
| C. | a rigid pipe burried in a narrow trenches and thoroughly compacted side fills, is proportional to the square of the width of the trench |
| D. | all the above. |
| Answer» E. | |
| 160. |
Alum is a |
| A. | coagulant |
| B. | flocculant |
| C. | catalyst |
| D. | disinfectant. |
| Answer» B. flocculant | |
| 161. |
The level of underground water is called |
| A. | water level |
| B. | water table |
| C. | negative level |
| D. | invert level. |
| Answer» C. negative level | |
| 162. |
Increase in population of a rapidly growing city, may be estimated by |
| A. | arithmetical mean method |
| B. | geometrical method |
| C. | incremental increase method |
| D. | graphical comparison method. |
| Answer» C. incremental increase method | |
| 163. |
For estimating the run off of catchments, the mean value of the constant 'K' in the Khosla's formula Qy = Py - K (1.8 Ty + 32) is |
| A. | 1.21 |
| B. | 1.23 |
| C. | 1.25 |
| D. | 1.27 |
| Answer» E. | |
| 164. |
Hard water for public water supply is discarded because |
| A. | it consumes more soap |
| B. | it contains lot of turbidity |
| C. | it contains pathogenic bacterias |
| D. | it possesses bad taste and odour |
| Answer» B. it contains lot of turbidity | |
| 165. |
In a rapid gravity 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. | none of these. |
| Answer» D. none of these. | |
| 166. |
Efficiency of removing bacterias from raw water by a slow sand filter, is |
| A. | 80% to 81% |
| B. | 85% to 86% |
| C. | 90% to 97% |
| D. | 98% to 99%. |
| Answer» E. | |
| 167. |
Disappearance of pink colour of water of a well due of KMnO4 indicates that water contains |
| A. | acidity |
| B. | alkalinity |
| C. | turbidity |
| D. | organic matter |
| Answer» E. | |
| 168. |
The fire demand of a city may be worked out by |
| A. | Kuichling's formula |
| B. | Freeman formula |
| C. | Under Writers formula |
| D. | Bustan's formula |
| Answer» E. | |
| 169. |
The depth of the water table at a place is 45 m below the general ground level. To lift water from a deep tube well in such a locality, the type of pump to be installed is |
| A. | Centrifugal pump |
| B. | Reciprocating pump |
| C. | Deep well turbine pump |
| D. | None of these. |
| Answer» D. None of these. | |
| 170. |
Most important method for calculating discharge for planning a water supply project, is |
| A. | velocity area method |
| B. | weir or spillway method |
| C. | use of venturi-meter |
| D. | using power plant consumption |
| Answer» B. weir or spillway method | |
| 171. |
At break point of chlorination, |
| A. | chlorine is used to oxidise |
| B. | residual chloride is zero |
| C. | residual chloride is maximum |
| D. | residual chlorine reappears. |
| Answer» E. | |
| 172. |
135 litres of water per person per day, is provided in |
| A. | nurses homes |
| B. | hostels |
| C. | residential schools |
| D. | all the above. |
| Answer» E. | |
| 173. |
The prescribed hardness limit of potable water ranges between |
| A. | 50 to 75 P.P.M. |
| B. | 75 to 115 P.P.M. |
| C. | 100 to 150 P.P.M. |
| D. | 150 to 200 P.P.M. |
| Answer» C. 100 to 150 P.P.M. | |
| 174. |
Pick up the wrong nominal internal diameter of cast iron (spun) pipes in mm from the following : |
| A. | 300 |
| B. | 400 |
| C. | 500 |
| D. | 550 |
| Answer» E. | |
| 175. |
Low turbidity of water is detected by |
| A. | Turbidity tube |
| B. | Jackson turbidity meter |
| C. | Baylis turbidimeter |
| D. | Hellipe turbidimeter |
| Answer» D. Hellipe turbidimeter | |
| 176. |
Corrosion of a pipe |
| A. | reduces its life span |
| B. | reduces its carrying capacity |
| C. | adds colour to water |
| D. | adds odour to water |
| Answer» E. | |
| 177. |
The intake opening is generally covered by a screen to prevent entry of debris etc. and its level is kept |
| A. | at the level of water of the source |
| B. | at the bottom of water of the source |
| C. | at about 2.5 m above the bottom |
| D. | none of these. |
| Answer» D. none of these. | |
| 178. |
Ground water from artesian wells |
| A. | contains no suspended materials |
| B. | contains dissolved salts |
| C. | may be saltish and hard |
| D. | generally require lesser treatment |
| Answer» E. | |
| 179. |
The permissible amount of nitrites present in potable water, is |
| A. | 10 ppm |
| B. | 15 ppm |
| C. | 20 ppm |
| D. | 45 ppm |
| Answer» E. | |
| 180. |
Filtration of water is done to remove |
| A. | colour |
| B. | odour |
| C. | turbidity |
| D. | pathogenic bacteria |
| Answer» D. pathogenic bacteria | |
| 181. |
P.V.C. pipes can withstand pressure bead of water upto |
| A. | 25 m |
| B. | 50 m |
| C. | 75 m |
| D. | 100 m |
| Answer» E. | |
| 182. |
Corrosion of well pipes may not be reduced by |
| A. | reducing the draw down and the pumping rate |
| B. | reducing the flow velocity |
| C. | using thicker pipes |
| D. | using screens having larger area of openings |
| Answer» E. | |
| 183. |
In an artesian acquifer, the draw downs in two observation wells at distances 100 m, and 200 m were found same after one hour and x hours respectively. The value of x, is |
| A. | 2 hours |
| B. | 4 hours |
| C. | 9 hours |
| D. | 16 hours. |
| Answer» C. 9 hours | |
| 184. |
The cast iron pipes for water supply system are used for |
| A. | durability |
| B. | strength |
| C. | easy connection |
| D. | low maintenance cost |
| Answer» E. | |
| 185. |
Generally, first portion of a logistic curve for the population growth of a developing city, represents the growth of |
| A. | increasing |
| B. | decreasing |
| C. | constant |
| D. | all the above. |
| Answer» B. decreasing | |
| 186. |
Before constructing a dam, the factor to be considered for controlling sedimentation, is |
| A. | selection of dam site |
| B. | construction of check dams |
| C. | providing vegetation screens |
| D. | providing under-sluices in the dam |
| Answer» E. | |
| 187. |
Distribution mains of any water supply, is normally designed for its average daily requirement |
| A. | 1 |
| B. | 1.5 |
| C. | 2 |
| D. | 225%. |
| Answer» E. | |
| 188. |
Hard water contains |
| A. | calcium |
| B. | magnesium bicarbonates |
| C. | magnesium sulphate |
| D. | all the above. |
| Answer» E. | |
| 189. |
The yield of a rapid gravity filter as compared to that of slow sand filter, is |
| A. | 10 times |
| B. | 15 times |
| C. | 20 times |
| D. | 30 times |
| Answer» E. | |
| 190. |
Economic height of a dam is the height corresponding to which |
| A. | cost of the dam per unit of storage is minimum |
| B. | amount of silting is less |
| C. | cost of dam per unit storage is maximum |
| D. | free board provided is least |
| Answer» B. amount of silting is less | |
| 191. |
Velocity of flow of water in plain sedimentation water tank, is normally kept |
| A. | 3 cm/minute |
| B. | 10 cm/minute |
| C. | 20 cm/minute |
| D. | 30 cm/minute |
| Answer» E. | |
| 192. |
The R.L. of ground water table on the sides of a valley is 1505 m whereas R.L. of the stream water is 1475 m. If 60° slope consists of pervious soil between R.L. 1485 m to 1500 m, the gravity spring may be expected at the point of reduced level |
| A. | 1500 m |
| B. | 1505 m |
| C. | 1475 m |
| D. | 1485 m. |
| Answer» E. | |
| 193. |
The chlorine supply cylinders are generally kept at 38°C to 40°C to prevent |
| A. | conversion into crystals |
| B. | it from burning |
| C. | it from explosion |
| D. | none of these. |
| Answer» B. it from burning | |
| 194. |
In pumping stations, the type of joint generally used, is |
| A. | socket and spigot joint |
| B. | flanged joint |
| C. | expansion joint |
| D. | dresser coupling joint |
| Answer» C. expansion joint | |
| 195. |
Pick up the incorrect statement from the following regarding fire hydrants |
| A. | Fire hydrants are fitted in water mains at 100 m to 150 m apart at fire |
| B. | The minimum water pressure hydrants, is kept 1.5 kg/cm2 |
| C. | The water at pressure 1 to 1.5 kg/cm2 is made available for 4 to 5 hours for constant use |
| D. | None of these. |
| Answer» E. | |
| 196. |
The population growth curve is |
| A. | S-shaped curve |
| B. | parabolic curve |
| C. | circular curve |
| D. | straight line |
| Answer» B. parabolic curve | |
| 197. |
Air inlet valve in water mains, is generally provided at |
| A. | summit of the pipe |
| B. | upstream of sluice valve |
| C. | down stream of sluice valve |
| D. | valley of the pipe |
| Answer» E. | |
| 198. |
If Q is discharge is cubicmetres per sec and D is the economical diameter of the pipe. According to Lea |
| A. | D = 0.67 to 0.87 Q |
| B. | D = 0.77 to 0.97 Q |
| C. | D = 0.97 to 1.22 Q |
| D. | D = 1.22 to 1.33 Q. |
| Answer» D. D = 1.22 to 1.33 Q. | |
| 199. |
The ratio of the maximum daily consumption to the average daily demand, is |
| A. | 1 |
| B. | 1.2 |
| C. | 1.4 |
| D. | 1.6 |
| Answer» E. | |
| 200. |
The bacterias which require free oxygen for their survival, are called |
| A. | Aerobic bacterias |
| B. | Anaerobic bacterias |
| C. | Faculative bacteria |
| D. | None of these. |
| Answer» B. Anaerobic bacterias | |