MCQOPTIONS
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MCQOPTIONS
This section includes 238 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. |
Average rate of water consumption per head per day as per Indian Standard is |
| A. | 00 liters |
| B. | 35 liters |
| C. | 65 liters |
| D. | 00 liters |
| Answer» C. 65 liters | |
| 152. |
Which of the following compounds is widely used for algae control? |
| A. | odium sulphate |
| B. | opper sulphate |
| C. | odium chloride |
| D. | alcium chloride |
| Answer» C. odium chloride | |
| 153. |
The main disadvantage of cement concrete sewers is |
| A. | ess strength |
| B. | ifficulty in construction |
| C. | ifficulty in transportation due to heavy weight |
| D. | ess life |
| Answer» D. ess life | |
| 154. |
The overflow rate for plain sedimentation tanks is about |
| A. | 00 to 750 liters/hour/ m² |
| B. | 000 to 1250 liters/hour/ m² |
| C. | 250 to 1500 liters/hour/m² |
| D. | 500 to 2000 liters/hour/m² |
| Answer» B. 000 to 1250 liters/hour/ m² | |
| 155. |
Standard BOD is measured at |
| A. | 0°C - 1 day |
| B. | 5°C - 3 day |
| C. | 0°C - 5 day |
| D. | 0°C - 5 day |
| Answer» D. 0°C - 5 day | |
| 156. |
The alum, when added as a coagulant in water |
| A. | oes not require alkalinity in water for flocculation |
| B. | oes not affect pH value of water |
| C. | ncreases pH value of water |
| D. | ecreases pH value of water |
| Answer» E. | |
| 157. |
The settling velocity of a particle in a sedimentation tank depends on |
| A. | epth of tank |
| B. | urface area of tank |
| C. | oth depth and surface area of tank |
| D. | one of the above |
| Answer» C. oth depth and surface area of tank | |
| 158. |
For a given discharge, the efficiency of sedimentation tank can be increased by |
| A. | ncreasing the depth of tank |
| B. | ecreasing the depth of tank |
| C. | ncreasing the surface area of tank |
| D. | ecreasing the surface area of tank |
| Answer» D. ecreasing the surface area of tank | |
| 159. |
The type of valve, which is provided on the suction pipe in a tube-well, is |
| A. | ir relief valve |
| B. | eflux valve |
| C. | ressure relief valve |
| D. | luice valve |
| Answer» C. ressure relief valve | |
| 160. |
Sewerage system is designed for |
| A. | aximum flow only |
| B. | inimum flow only |
| C. | verage flow only |
| D. | aximum and minimum flow |
| Answer» E. | |
| 161. |
If the average daily consumption of a city is 100,000 m³, the maximum daily consumption on peak hourly demand will be |
| A. | 00000 m³ |
| B. | 50000 m³ |
| C. | 80000 m³ |
| D. | 70000 m³ |
| Answer» E. | |
| 162. |
Scour valves are provided |
| A. | t street corners to control the flow of water |
| B. | t every depression and dead ends to drain out the waste water that may collect there |
| C. | t the foot of rising main along the slope to prevent back running of water |
| D. | t every summit of rising mains |
| Answer» C. t the foot of rising main along the slope to prevent back running of water | |
| 163. |
The depression of water table in a well due to pumping will be maximum(Where ‘R’ is the radius of influence) |
| A. | t a distance R from the well |
| B. | lose to the well |
| C. | t a distance R/2 from the well |
| D. | one of the above |
| Answer» C. t a distance R/2 from the well | |
| 164. |
A pipe conveying sewage from plumbing system of a single building to common sewer or point of immediate disposal is called |
| A. | ouse sewer |
| B. | ateral sewer |
| C. | ain sewer |
| D. | ub-main sewer |
| Answer» B. ateral sewer | |
| 165. |
Hardy cross method of analysis of distribution system(i) Involves successive trials(ii) Takes economic aspects into account(iii) Is time consuming |
| A. | nly (i) |
| B. | i) and (ii) |
| C. | i) and (iii) |
| D. | ll are correct |
| Answer» D. ll are correct | |
| 166. |
The layout of distribution system in which water flows towards the outer periphery is |
| A. | ing system |
| B. | ead end system |
| C. | adial system |
| D. | rid iron system |
| Answer» D. rid iron system | |
| 167. |
Ground water is usually free from |
| A. | uspended impurities |
| B. | issolved impurities |
| C. | oth suspended and dissolved impurities |
| D. | one of the above |
| Answer» B. issolved impurities | |
| 168. |
The most commonly used sewer under culverts is |
| A. | ircular brick sewer |
| B. | ircular cast iron sewer |
| C. | emi-elliptical sewer |
| D. | orseshoe type sewer |
| Answer» B. ircular cast iron sewer | |
| 169. |
The maximum discharge of a tube well is about |
| A. | liters/sec |
| B. | 0 liters/sec |
| C. | 00 liters/sec |
| D. | 000 liters/sec |
| Answer» C. 00 liters/sec | |
| 170. |
Turbidity is measured on |
| A. | tandard silica scale |
| B. | tandard cobalt scale |
| C. | tandard platinum scale |
| D. | latinum cobalt scale |
| Answer» B. tandard cobalt scale | |
| 171. |
Settling velocity increases with |
| A. | pecific gravity of solid particles |
| B. | ize of particles |
| C. | epth of tank |
| D. | emperature of liquid |
| Answer» D. emperature of liquid | |
| 172. |
The chemical most commonly used to increase speed of sedimentation of sewage is |
| A. | ulphuric acid |
| B. | opper sulphate |
| C. | ime |
| D. | odium permanganate |
| Answer» D. odium permanganate | |
| 173. |
Air binding phenomena in rapid sand filters occur due to |
| A. | xcessive negative head |
| B. | ud ball formation |
| C. | igher turbidity in the effluent |
| D. | ow temperature |
| Answer» B. ud ball formation | |
| 174. |
The settling velocity of a particle in a sedimentation tank increases if |
| A. | article size is decreased |
| B. | he surface area of tank is increased |
| C. | he depth of tank is decreased |
| D. | one of the above |
| Answer» E. | |
| 175. |
The major disadvantage of lime soda process of water softening is that |
| A. | t is unsuitable for turbid and acidic water |
| B. | uge amount of precipitate is formed which creates a disposal problem |
| C. | he effluent cannot be reduced to zero hardness |
| D. | t is unsuitable for softening the water of excessive hardness |
| Answer» C. he effluent cannot be reduced to zero hardness | |
| 176. |
The design discharge for the combined sewer system shall be taken as |
| A. | qual to rainfall |
| B. | ainfall + DWF |
| C. | ainfall + 2 DWF |
| D. | ainfall + 6 DWF |
| Answer» D. ainfall + 6 DWF | |
| 177. |
The design discharge for the separate sewer system shall be taken as |
| A. | qual to dry weather flow (DWF) |
| B. | × DWF |
| C. | × DWF |
| D. | × DWF |
| Answer» E. | |
| 178. |
The detention period in coagulation tanks is usually kept as |
| A. | to 2 minutes |
| B. | 0 to 45 minutes |
| C. | to 6 hours |
| D. | to 6 days |
| Answer» D. to 6 days | |
| 179. |
Which of the following methods of analysis of water distribution system is most suitable for long and narrow pipe system? |
| A. | ircle method |
| B. | quivalent pipe method |
| C. | ardy cross method |
| D. | lectrical analysis method |
| Answer» C. ardy cross method | |
| 180. |
Which of the following unit works in anaerobic conditions? |
| A. | ludge digestion tank |
| B. | edimentation tank |
| C. | ctivated sludge treatment |
| D. | rickling filters |
| Answer» B. edimentation tank | |
| 181. |
The per capital consumption of a locality is affected by(i) Climatic conditions(ii) Quality of water(iii) Distribution pressure |
| A. | nly (i) |
| B. | oth (i) and (ii) |
| C. | oth (i) and (iii) |
| D. | ll (i), (ii) and (iii) |
| Answer» E. | |
| 182. |
Disinfection efficiency is |
| A. | educed at higher pH value of water |
| B. | naffected by pH value of water |
| C. | ncreased at higher pH value of water |
| D. | ighest at pH value equal to 7 |
| Answer» B. naffected by pH value of water | |
| 183. |
The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally |
| A. | ess and more |
| B. | ess and less |
| C. | ore and less |
| D. | ore and more |
| Answer» D. ore and more | |
| 184. |
The suitable method for disinfection of swimming pool water is |
| A. | ltra violet rays treatment |
| B. | ime treatment |
| C. | y using potassium permanganate |
| D. | hlorination |
| Answer» B. ime treatment | |
| 185. |
Cleaning is done by(i) Scraping and removal in filters slow sand(ii) Back washing in slow sand filters(iii) Scraping and removal in filters rapid sand(iv) Back washing in rapid sand filtersThe correct answer is |
| A. | i) and (ii) |
| B. | ii) and (iii) |
| C. | i) and (iv) |
| D. | ii) and (iv) |
| Answer» D. ii) and (iv) | |
| 186. |
The amount of coagulant needed for coagulation of water increases with(i) Increase in turbidity of water(ii) Decrease in turbidity of water(iii) Increase in temperature of water(iv) Decrease in temperature of waterThe correct answer is |
| A. | i) and (ii) |
| B. | i)and(iv) |
| C. | ii) and (iii) |
| D. | ii) and (iv) |
| Answer» C. ii) and (iii) | |
| 187. |
As compared to rapid sand filters, slow sand filters give(i) Slower filtration rate(ii) Higher filtration rate(iii) Lesser efficiency in removal of bacteria(iv) Higher efficiency in removal of bacteriaThe correct answer is |
| A. | i) and (ii) |
| B. | ii) and (iii) |
| C. | i) and (iv) |
| D. | ii) and (iv) |
| Answer» D. ii) and (iv) | |
| 188. |
In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be |
| A. | 00 ppm |
| B. | 00 ppm |
| C. | 00 ppm |
| D. | 00 ppm |
| Answer» C. 00 ppm | |
| 189. |
The polluted water is one which |
| A. | ontains pathogenic bacteria |
| B. | onsists of undesirable substances rendering it unfit for drinking and domestic use |
| C. | s safe and suitable for drinking and domestic use |
| D. | s contaminated |
| Answer» C. s safe and suitable for drinking and domestic use | |
| 190. |
Activated carbon is used for |
| A. | isinfection |
| B. | emoving hardness |
| C. | emoving odours |
| D. | emoving corrosiveness |
| Answer» D. emoving corrosiveness | |
| 191. |
Sewerage system is usually designed for |
| A. | 0 years |
| B. | 5 years |
| C. | 0 years |
| D. | 5 years |
| Answer» C. 0 years | |
| 192. |
The biochemical treatment of sewage effluents is essentially a process of |
| A. | xidation |
| B. | ehydration |
| C. | eduction |
| D. | lkalinization |
| Answer» B. ehydration | |
| 193. |
The minimum and maximum diameters of sewers shall preferably be |
| A. | 5 cm and 100 cm |
| B. | 5 cm and 300 cm |
| C. | 0 cm and 450 cm |
| D. | 0 cm and 300 cm |
| Answer» C. 0 cm and 450 cm | |
| 194. |
In facultative stabilization pond, the sewage is treated by |
| A. | erobic bacteria only |
| B. | lgae only |
| C. | ual action of aerobic bacteria and anaerobic bacteria |
| D. | edimentation |
| Answer» D. edimentation | |
| 195. |
In water treatment, rapid gravity filters are adopted to remove |
| A. | issolved organic substances |
| B. | issolved solids and dissolved gases |
| C. | loating solids and dissolved inorganic solids |
| D. | acteria and colloidal solids |
| Answer» E. | |
| 196. |
As compared to cast iron pipes, steel pipes are |
| A. | eavier |
| B. | tronger |
| C. | ostlier |
| D. | ess susceptible to corrosion |
| Answer» C. ostlier | |
| 197. |
Laying of sewers is usually done with the help of |
| A. | Theodolite |
| B. | compass |
| C. | ight rails and boning rods |
| D. | plane table |
| Answer» D. plane table | |
| 198. |
If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to |
| A. | otal alkalinity |
| B. | otal hardness |
| C. | otal hardness total alkalinity |
| D. | on carbonate hardness |
| Answer» B. otal hardness | |
| 199. |
Disinfection of water results in |
| A. | emoval of turbidity |
| B. | emoval of hardness |
| C. | illing of disease bacteria |
| D. | omplete sterilisation |
| Answer» D. omplete sterilisation | |
| 200. |
A sewer that receives the discharge of a number of house sewers is called |
| A. | ouse sewer |
| B. | ateral sewer |
| C. | ntercepting sewer |
| D. | ub-main sewer |
| Answer» C. ntercepting sewer | |