McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 151. |
Gravity conduits are generally in the form of |
| A. | Canals |
| B. | Flumes |
| C. | Aqueduct |
| D. | All the above |
| Answer» D. All the above | |
| 152. |
The bed slope in slow sand filters, is generally kept |
| A. | 1 in 50 |
| B. | 1 in 75 |
| C. | 1 in 100 |
| D. | 1 : 200 |
| Answer» C. 1 in 100 | |
| 153. |
Perched aquifers are generally found |
| A. | On the surface of the ground |
| B. | Below the surface of the ground but above water table |
| C. | Below the water table |
| D. | All the above |
| Answer» B. Below the surface of the ground but above water table | |
| 154. |
Pick up the incorrect statement from the following: |
| A. | The pH value of water indicates the logarithm of reciprocal of hydrogen ion concentration in water |
| B. | Higher value of pH means lower hydrogen ion concentration |
| C. | Lower value of pH means higher hydrogen ion contraction |
| D. | Lower value of pH gives alkaline solution |
| Answer» D. Lower value of pH gives alkaline solution | |
| 155. |
Mostly used coagulant, is |
| A. | Chlorine |
| B. | Alum |
| C. | Lime |
| D. | Bleaching powder |
| Answer» B. Alum | |
| 156. |
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» A. At higher level than water level of reservoir | |
| 157. |
Normal values of overflow rate for plain sedimentation tank, is |
| A. | 250 to 500 litres/hr/m2 |
| B. | 500 to 750 litres/hr/m2 |
| C. | 750 to 1000 litres/hr/m2 |
| D. | 1000 to 1250 litres/hr/m2 |
| Answer» B. 500 to 750 litres/hr/m2 | |
| 158. |
'Shrouding' is essentially provided in |
| A. | Strainer type wells |
| B. | Cavity type wells |
| C. | Slotted type well |
| D. | All the above |
| Answer» C. Slotted type well | |
| 159. |
The maximum permissible hardness for public supplies is |
| A. | 95 mg/litre |
| B. | 105 mg/litre |
| C. | 115 mg/litre |
| D. | 125 mg/litre |
| Answer» C. 115 mg/litre | |
| 160. |
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» A. Conversion into crystals | |
| 161. |
For calculation of economical diameter D of a pipe in metres for a discharge Q to be pumped in cumecs, Lea suggested the empirical formula |
| A. | D = 0.22 𝑄 |
| B. | D = 1.22 𝑄 |
| C. | D = 2.22 𝑄 |
| D. | D = 3.22 𝑄 |
| Answer» B. D = 1.22 𝑄 | |
| 162. |
An earth formation which, although porous and capable of absorbing water does not provide an appreciable supply to wells, is known as |
| A. | Aquifer |
| B. | Aquiclude |
| C. | Aquifuge |
| D. | None of these |
| Answer» B. Aquiclude | |
| 163. |
Property of earth to allow water to pass through it, is known as |
| A. | Perviousness |
| B. | Porosity |
| C. | Permeability |
| D. | Tr |
| Answer» B. Porosity | |
| 164. |
If G is the specific gravity of particles of diameter d, the velocity of settlement V in still water at T°C, according to Stoke's law, is |
| A. | V = 418 (G - 1) d² [(3T + 70)/100] |
| B. | V = 418 (G - 1) d [(3T - 70)/100] |
| C. | V = 418 (G - 1) d² [(2T + 70)/100] |
| D. | V = 418 (G - 1) d 4 [(3T + 70)/100] |
| Answer» A. V = 418 (G - 1) d² [(3T + 70)/100] | |
| 165. |
Distribution mains of any water supply, is normally designed for its average daily requirement |
| A. | 100 % |
| B. | 150 % |
| C. | 200 % |
| D. | 225 % |
| Answer» D. 225 % | |
| 166. |
Maximum threshold number permitted for indicating the odour of public water supplies, is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 167. |
The rate of silting in a reservoir |
| A. | Is less in the beginning |
| B. | Remains constant throughout |
| C. | Is more in the beginning |
| D. | is more in the beginning and reduces in the end |
| Answer» D. is more in the beginning and reduces in the end | |
| 168. |
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» D. Using screens having larger area of openings | |
| 169. |
Recuperation test is carried out to determine |
| A. | Turbidity of water |
| B. | pH value of water |
| C. | Yield of well |
| D. | Discharge from a well |
| Answer» C. Yield of well | |
| 170. |
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» D. Storage reservoirs | |
| 171. |
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» A. Velocity area method | |
| 172. |
In a rapid sand filter, air binding is caused due to excessive |
| A. | Negative pressure |
| B. | Pressure |
| C. | Turbidity |
| D. | Water pressure |
| Answer» A. Negative pressure | |
| 173. |
One degree of hardness of water means a content of salts of |
| A. | 10.25 mg/litre |
| B. | 12.25 mg/litre |
| C. | 14.25 mg/litre |
| D. | 16.25 mg/litre |
| Answer» C. 14.25 mg/litre | |
| 174. |
The U.C. (uniformity coefficient) D60/D10 for the best filter media sand should be |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» A. 2 | |
| 175. |
Manholes are less common in |
| A. | Cast iron pipes |
| B. | Steel pipes |
| C. | Hume steel pipes |
| D. | R.C.C. pipes |
| Answer» A. Cast iron pipes | |
| 176. |
For determining the velocity of flow of underground water, the most commonly used nonempirical formula is |
| A. | Darcy's formula |
| B. | Slichter's formula |
| C. | Hazen's formula |
| D. | Lacy's formula |
| Answer» A. Darcy's formula | |
| 177. |
The most commonly used chemical for de-chlorination of water, is |
| A. | Sodium thiosulphate |
| B. | Sodium bisulphate |
| C. | Sodium sulphite |
| D. | Sulphur-dioxide |
| Answer» C. Sodium sulphite | |
| 178. |
To remove very fine suspended particles from water, the method adopted is |
| A. | Screening |
| B. | Sedimentation |
| C. | Boiling |
| D. | Filtration |
| Answer» D. Filtration | |
| 179. |
Sunlight |
| A. | Helps growth of bacterias |
| B. | Impedes growth of algae |
| C. | Increases dissolved oxygen content |
| D. | Reduces turbidity |
| Answer» B. Impedes growth of algae | |
| 180. |
The detention period for plain sedimentation water tanks, is usually |
| A. | 4 to 8 hours |
| B. | 8 to 16 hours |
| C. | 16 to 24 hours |
| D. | 24 to 36 hours |
| Answer» D. 24 to 36 hours | |
| 181. |
Air valves are generally provided in pressure pipes of water supply |
| A. | At pipe junctions (B) (C) (D) |
| B. | At summits |
| C. | At low points |
| D. | Near service pipes |
| Answer» B. At summits | |
| 182. |
The gaseous form of chlorine gets converted into liquid form when subjected to a pressure of |
| A. | 5 kg/cm2 |
| B. | 6 kg/cm2 |
| C. | 7 kg/cm2 |
| D. | 10 kg/cm2 |
| Answer» C. 7 kg/cm2 | |
| 183. |
Flow through period, in sedimentation tanks, is |
| A. | Equal to detention period |
| B. | More than detention period |
| C. | Less than detention period |
| D. | Detention period divided by displacement efficiency |
| Answer» C. Less than detention period | |
| 184. |
The maximum hourly consumption, is generally taken as |
| A. | 110 % |
| B. | 120 % |
| C. | 140 % |
| D. | 150 % |
| Answer» D. 150 % | |
| 185. |
Hardness of water can be removed by boiling if it is due to |
| A. | Calcium bicarbonates |
| B. | Calcium sulphates |
| C. | Calcium chloride |
| D. | Calcium nitrates |
| Answer» A. Calcium bicarbonates | |
| 186. |
Hardness of water is caused by |
| A. | Presence of soap lather |
| B. | Presence of chlorides and sulphates of sodium and potassium |
| C. | Presence of bicarbonates, sulphates or chlorides of calcium and magnesium |
| D. | Turbidity |
| Answer» C. Presence of bicarbonates, sulphates or chlorides of calcium and magnesium | |
| 187. |
The average domestic consumption under normal conditions in an Indian city per day per person, is |
| A. | 105 litres |
| B. | 115 litres |
| C. | 125 litres |
| D. | 135 litres |
| Answer» D. 135 litres | |
| 188. |
If d is the diameter of the pipe, p is the total internal pressure, f is the permissible tensile stress and n is the effective of the joint, the thickness t of metal pipe, is |
| A. | n (pd/2f) |
| B. | (1/n) (pd/2f) |
| C. | (1/n) (pd/3f) |
| D. | (1/n) (pf/d) |
| Answer» B. (1/n) (pd/2f) | |
| 189. |
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» A. Increasing | |
| 190. |
A pressure conduit carrying water beneath a stream or a canal, is known as |
| A. | Sag (B) (C) (D) |
| B. | Depressed pipe |
| C. | Inverted syphon |
| D. | All the above |
| Answer» D. All the above | |
| 191. |
Most satisfactory formula for an estimate of fire demand Q for a city of population P in thousands for Indian conditions, is |
| A. | Q = 1115 (p/5 + 20) |
| B. | Q = 1640 𝑃 (1 - 0.01 𝑃) |
| C. | Q = 3180 𝑃 |
| D. | None of these |
| Answer» C. Q = 3180 𝑃 | |
| 192. |
Permanent hardness of water can be removed by |
| A. | Adding alum |
| B. | Adding lime |
| C. | Adding chlorine |
| D. | Zeolite process |
| Answer» D. Zeolite process | |
| 193. |
The maximum depth of sedimentation tanks is limited to |
| A. | 2 m (B) (C) (D) |
| B. | 3 m |
| C. | 5 m |
| D. | 6 m |
| Answer» D. 6 m | |
| 194. |
Pick up the incorrect statement from the following. Intake 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» C. Be located downstream of waste water disposal point | |
| 195. |
The fire demand of a city may be worked out by |
| A. | Kuichling's formula |
| B. | Freeman formula |
| C. | Under Writers formula |
| D. | All the above |
| Answer» D. All the above | |
| 196. |
The formula HL = n²V²L/R4/3 for the head loss in conduits is generally known as |
| A. | Hazen-William's formula |
| B. | Manning's formula |
| C. | Darcy-Weisbach formula |
| D. | Nikuradse formula |
| Answer» B. Manning's formula | |
| 197. |
The joint used for joining the plain ends of cast iron pipes, is |
| A. | Flanged joint |
| B. | Socket and spigot joint |
| C. | Dresser coupling joint |
| D. | Flexible joint |
| Answer» C. Dresser coupling joint | |
| 198. |
Disinfection of water with ozone is not good because |
| A. | It vanishes before water reaches the consumers |
| B. | It removes the colour, taste and odour from water as bacterias |
| C. | It adds taste to the water |
| D. | It is more efficient than chlorine in killing bacterias |
| Answer» D. It is more efficient than chlorine in killing bacterias | |
| 199. |
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» B. 75 to 115 P.P.M. | |
| 200. |
While designing a water supply of an industrial township, industrial and commercial water demand of total supply, is assumed |
| A. | 10 % (B) (C) (D) |
| B. | 10 to 15 % |
| C. | 15 to 20 % |
| D. | 20 to 25 % |
| Answer» D. 20 to 25 % | |
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