MCQOPTIONS
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MCQOPTIONS
This section includes 641 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The minimum recommended diameter of sewers, is_________________? |
| A. | 5 cm |
| B. | 10 cm |
| C. | 15 cm |
| D. | 20 cm |
| Answer» D. 20 cm | |
| 102. |
The minimum diameter of sewer to be adopted is_________________? |
| A. | 10 cm |
| B. | 12.5 cm |
| C. | 15 cm |
| D. | 25 cm |
| Answer» D. 25 cm | |
| 103. |
The minimum diameter of a sewer is kept __________________? |
| A. | 10 cm |
| B. | 15 cm |
| C. | 20 cm |
| D. | 25 cm |
| Answer» C. 20 cm | |
| 104. |
The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is____________________? |
| A. | 20 m |
| B. | 30 m |
| C. | 45 m |
| D. | 75 m |
| Answer» D. 75 m | |
| 105. |
The maximum diameter of sewers adopted in the designs is_______________? |
| A. | 1.0 m |
| B. | 2.0 m |
| C. | 3.0 m |
| D. | 4.0 m |
| Answer» D. 4.0 m | |
| 106. |
The maximum depth of sedimentation tanks, is kept__________________? |
| A. | 3 m |
| B. | 3.5 m |
| C. | 4 m |
| D. | 4.5 m |
| Answer» B. 3.5 m | |
| 107. |
The liquid wastes from kitchens, bath rooms and wash basins, is not called________________? |
| A. | Liquid waste |
| B. | Sullage |
| C. | Sewage |
| D. | None of these |
| Answer» D. None of these | |
| 108. |
The laying of sewers is done with____________________? |
| A. | Magnetic compass |
| B. | Theodolite |
| C. | Level |
| D. | Clinometer |
| Answer» D. Clinometer | |
| 109. |
The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called_______________? |
| A. | A heap |
| B. | Plateau |
| C. | Windrow |
| D. | None of these |
| Answer» E. | |
| 110. |
The intensity of rain is expressed in________________? |
| A. | cm/minute |
| B. | cm/hour |
| C. | cm/day |
| D. | None of these |
| Answer» C. cm/day | |
| 111. |
The grit chambers of sewage treatment plants, are generally cleaned after__________________? |
| A. | 2 days |
| B. | 7 days |
| C. | 12 days |
| D. | 14 days |
| Answer» E. | |
| 112. |
The grit and silt of the grit chambers, may not be used for_________________? |
| A. | Raising low lying areas by dumping |
| B. | Concreting |
| C. | Both A. and B. |
| D. | Neither A. nor B |
| Answer» C. Both A. and B. | |
| 113. |
The gradient of sewers depends upon_________________? |
| A. | Velocity of flow |
| B. | Diameter of the sewer |
| C. | Discharge |
| D. | All the above |
| Answer» E. | |
| 114. |
The gas which may cause explosion in sewers, is_________________? |
| A. | Carbondioxide |
| B. | Methane |
| C. | Ammonia |
| D. | Carbon monoxide |
| Answer» C. Ammonia | |
| 115. |
The gas evolved in sewers is________________? |
| A. | Carbondioxide |
| B. | Hydrogen sulphide |
| C. | Methane |
| D. | All of these |
| Answer» E. | |
| 116. |
The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning’s formula, is given by______________________? |
| A. | Bazin |
| B. | Crimp and Bruges |
| C. | William-Hazen |
| D. | Kutter |
| Answer» C. William-Hazen | |
| 117. |
The formula V = (1/n) r2/3____________________? |
| A. | Chezy’s formula |
| B. | Bazin’s formula |
| C. | Kutter’s formula |
| D. | Manning’s formula |
| Answer» E. | |
| 118. |
The following is the physical characteristic of sewage___________________? |
| A. | Turbidity |
| B. | Colour |
| C. | Odour |
| D. | All the above |
| Answer» E. | |
| 119. |
The flow velocity in detritus tanks is________________? |
| A. | 0.05 m/sec |
| B. | 0.09 m/sec |
| C. | 1.25 m/sec |
| D. | None of these |
| Answer» C. 1.25 m/sec | |
| 120. |
The first stage of neutral process of sludge digestion, is__________________? |
| A. | Acid fermentation |
| B. | Acid regressio |
| C. | Alkaline fermentation |
| D. | None of these |
| Answer» B. Acid regressio | |
| 121. |
The factor responsible for purification of sewage in river is________________? |
| A. | Hydrology |
| B. | Dissolved oxygen in water |
| C. | Temperature |
| D. | All the above |
| Answer» E. | |
| 122. |
The effluent of a septic tank is_________________? |
| A. | Fit for discharge into any open drain |
| B. | Foul and contains dissolved and suspended solids |
| C. | As good as that from a complete treatment |
| D. | None of these |
| Answer» B. Foul and contains dissolved and suspended solids | |
| 123. |
The drop man holes are generally provided in sewers for____________________? |
| A. | Industrial areas |
| B. | Large town ships |
| C. | Hilly town ships |
| D. | Cities in plains |
| Answer» D. Cities in plains | |
| 124. |
The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is__________________? |
| A. | 0.10 cumec |
| B. | 0.12 cumec |
| C. | 0.15 cumec |
| D. | 0.20 cumec |
| Answer» D. 0.20 cumec | |
| 125. |
The disintegrating pump in which solid matter is broken up before passing out, is__________________? |
| A. | Centrifugal pump |
| B. | Reciprocating pump |
| C. | Pneumatic ejector |
| D. | None of these |
| Answer» B. Reciprocating pump | |
| 126. |
The discharge per unit plan area of a sedimentation tank, is generally called________________? |
| A. | Over flow rate |
| B. | Surface loading |
| C. | Over flow velocity |
| D. | All the above |
| Answer» E. | |
| 127. |
The dimensions of a rectangular settling tank are: length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is_____________________? |
| A. | 204 cu.m |
| B. | 208 cu.m |
| C. | 212 cu.m |
| D. | 216 cu.m |
| Answer» E. | |
| 128. |
The digested sludge from septic tanks, is removed after a maximum period of__________________? |
| A. | 3 years |
| B. | 3.5 years |
| C. | 4 years |
| D. | 5 years |
| Answer» B. 3.5 years | |
| 129. |
The detention time (t) of a settling tank, may be defined as the time required for_________________? |
| A. | A particle to travel along its length |
| B. | A particle to travel from top surface to bottom sludge zone |
| C. | The flow of sewage to fill the tank |
| D. | None of these |
| Answer» D. None of these | |
| 130. |
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is________________? |
| A. | d² (0.011d + 0.785H)/Q |
| B. | d (0.022d + 0.085H)/Q |
| C. | d (0.785d + 0.011H)/Q |
| D. | d (0.285d + 0.011H)/Q |
| Answer» B. d (0.022d + 0.085H)/Q | |
| 131. |
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» B. 8 to 16 hours | |
| 132. |
The design period of sewage treatment works in normally_________________? |
| A. | 5 – 10 years |
| B. | 15 – 20 years |
| C. | 30 – 40 years |
| D. | 40 – 50 years |
| Answer» C. 30 – 40 years | |
| 133. |
The design period in years for pumping plants, is___________________? |
| A. | 1 |
| B. | 2 to 3 |
| C. | 3 to 5 |
| D. | 5 to 10 |
| Answer» E. | |
| 134. |
The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is_____________________? |
| A. | 0.05552 cumec |
| B. | 0.05554 cumec |
| C. | 0.05556 cumec |
| D. | 0.0556 cumec |
| Answer» D. 0.0556 cumec | |
| 135. |
The coagulant which is generally not used for treating the sewage, is__________________? |
| A. | Alum |
| B. | Ferric chloride |
| C. | Ferric sulphate |
| D. | Chlorinated copperas |
| Answer» B. Ferric chloride | |
| 136. |
The coagulant widely used for sewage treatment, is_________________? |
| A. | Alum |
| B. | Ferric chloride |
| C. | Ferric sulphate |
| D. | Chlorinated copperas |
| Answer» C. Ferric sulphate | |
| 137. |
The clarigesters are_________________? |
| A. | Circular septic tanks |
| B. | Rectangular septic tanks |
| C. | Circular Imhoff double tanks with bottom hoppers |
| D. | Circular Imhoff double storey tanks without bottom hoppers |
| Answer» E. | |
| 138. |
The Chezy’s constant C in the formula V = C_________________? |
| A. | Size of the sewer |
| B. | Shape of the sewer |
| C. | Roughness of sewer surface |
| D. | All the above |
| Answer» E. | |
| 139. |
The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope_________________? |
| A. | 1 in 5 |
| B. | 1 in 10 |
| C. | 1 in 15 |
| D. | 1 in 20 |
| Answer» C. 1 in 15 | |
| 140. |
The asbestos cement pipes are generally laid___________________? |
| A. | Horizontally |
| B. | Vertically |
| C. | At an angle of 30° |
| D. | At an angle of 60° |
| Answer» C. At an angle of 30° | |
| 141. |
The asbestos cement sewers are_________________? |
| A. | Light in weight |
| B. | Not structurally strong to bear large compressive stress |
| C. | Susceptible to corrosion by sulphuric acid |
| D. | All the above |
| Answer» E. | |
| 142. |
The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called ____________________? |
| A. | Inverted syphon |
| B. | Depressed sewer |
| C. | Sag pipe |
| D. | all of these |
| Answer» E. | |
| 143. |
The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is________________________? |
| A. | 20 cm |
| B. | 25 cm |
| C. | 40 cm |
| D. | 50 cm |
| Answer» E. | |
| 144. |
The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known_________________? |
| A. | Bio-Chemical Oxygen Demand (B.O.D.) |
| B. | Dissolved Oxygen (D.O.) |
| C. | Chemical Oxygen Demand (C.O.D.) |
| D. | None of these |
| Answer» C. Chemical Oxygen Demand (C.O.D.) | |
| 145. |
The algae dies out in the zone of_____________________? |
| A. | Degradation |
| B. | Active decomposition |
| C. | Recovery |
| D. | Cleaner water |
| Answer» B. Active decomposition | |
| 146. |
running partially full with central angle , For a circular sewer of diameter__________________? |
| A. | d/D = ½ (1 – – |
| B. | a/A |
| C. | r/R = [1 – |
| D. | All the above |
| Answer» E. | |
| 147. |
R.M.O. expenses include___________________? |
| A. | Running expenses |
| B. | Maintenance expenses |
| C. | Operation expenses |
| D. | All the above |
| Answer» E. | |
| 148. |
Removal of oil and grease from sewage, is known____________________? |
| A. | Screening |
| B. | Skimming |
| C. | Filtration |
| D. | None of these |
| Answer» C. Filtration | |
| 149. |
Rate of flow of sewage is generally assumed__________________? |
| A. | More than the rate of water supply |
| B. | Equal to the rate of water supply |
| C. | Less than the rate of water supply |
| D. | At 150 litres per capita |
| Answer» E. | |
| 150. |
Primary treatment of sewage consists of removal of__________________? |
| A. | Large suspended organic solids |
| B. | Oil and grease |
| C. | Sand and girt |
| D. | Floating materials |
| Answer» B. Oil and grease | |