MCQOPTIONS
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MCQOPTIONS
This section includes 344 Mcqs, each offering curated multiple-choice questions to sharpen your Surveying knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
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. | |
| 152. |
The pressure exerted by |
| A. | The sewage when running full from inside, is called internal pressure |
| B. | The internal pressure if any, causes tensile stress in the pipe material |
| C. | Pressure sewers are designed to be safe in tension |
| D. | All the above |
| Answer» E. | |
| 153. |
If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains |
| A. | Hydrogen sulphide |
| B. | Carbon dioxide |
| C. | Methane |
| D. | Oxygen |
| Answer» C. Methane | |
| 154. |
If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains |
| A. | Hydrogen sulphide |
| B. | Carbon dioxide |
| C. | Methane |
| D. | Oxygen |
| Answer» B. Carbon dioxide | |
| 155. |
The minimum diameter of a sewer is kept |
| A. | 10 cm |
| B. | 15 cm |
| C. | 20 cm |
| D. | 25 cm |
| Answer» C. 20 cm | |
| 156. |
The most efficient cross-section of sewers in a combined sewerage system is |
| A. | Parabolic |
| B. | Circular |
| C. | Rectangular |
| D. | New egged |
| Answer» C. Rectangular | |
| 157. |
The most efficient cross section of sewers in a separate sewerage system is |
| A. | Parabolic |
| B. | Circular |
| C. | Rectangular |
| D. | New egged |
| Answer» C. Rectangular | |
| 158. |
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 | |
| 159. |
Antisyphonage pipe is fitted |
| A. | At the end of septic tanks |
| B. | On manholes |
| C. | With a W.'trap |
| D. | At the beginning of sewer line |
| Answer» D. At the beginning of sewer line | |
| 160. |
During purification process of sewage the gas given off, is |
| A. | Carbon dioxide |
| B. | Hydrogen |
| C. | Ammonia |
| D. | All the above |
| Answer» E. | |
| 161. |
For drainage pipes in buildings the test applied before putting them to use, is |
| A. | Water test |
| B. | Smoke test |
| C. | Straightness test |
| D. | All the above |
| Answer» C. Straightness test | |
| 162. |
In a fully mechanised composting plant, involves |
| A. | Mechanized receipt |
| B. | Mechanized segregation |
| C. | Mechanized pulverising of refuse |
| D. | All of these |
| Answer» E. | |
| 163. |
A circular sewer section is preferred to because |
| A. | It is cheaper in construction |
| B. | It provides maximum area for a given perimeter |
| C. | It provides maximum hydraulic mean depth |
| D. | All the above |
| Answer» E. | |
| 164. |
Water content of sewage is about |
| A. | 90 % |
| B. | 95 % |
| C. | 99 % |
| D. | 99.9 % |
| Answer» E. | |
| 165. |
1000 kg of sewage contains |
| A. | 0.112 kg in suspension |
| B. | 0.112 kg in solution |
| C. | 0.225 kg in solution |
| D. | Both A and C of above |
| Answer» E. | |
| 166. |
3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the D.O. concentration was 5 mg/l. The BOD of raw sewerage is |
| A. | 100 mg/l |
| B. | 200 mg/l |
| C. | 300 mg/l |
| D. | 400 mg/l |
| Answer» D. 400 mg/l | |
| 167. |
For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is |
| A. | 10 cm |
| B. | 12 cm |
| C. | 15 cm |
| D. | 18 cm |
| Answer» D. 18 cm | |
| 168. |
If is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is |
| A. | 1.15 D |
| B. | 1.25 D |
| C. | 1.5 D |
| D. | 1.75 D |
| Answer» D. 1.75 D | |
| 169. |
For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is |
| A. | 16 m |
| B. | 20 m |
| C. | 24 m |
| D. | 30 m |
| Answer» D. 30 m | |
| 170. |
Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is? |
| A. | Centrifugal pump |
| B. | Pneumatic ejector |
| C. | Reciprocating pump |
| D. | None of these |
| Answer» B. Pneumatic ejector | |
| 171. |
The self-cleansing velocity of water flowing through pipe lines, is |
| A. | 2 metres/sec |
| B. | 1 metre/sec |
| C. | 0.5 metre/sec |
| D. | 0.25 metre/sec |
| Answer» B. 1 metre/sec | |
| 172. |
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. | |
| 173. |
The water carried sewerage system removes |
| A. | Domestic sewage |
| B. | Industrial sewage |
| C. | Storm sewage |
| D. | All the above |
| Answer» E. | |
| 174. |
The sewer which resists sulphide corrosion, is |
| A. | Brick sewer |
| B. | Cast iron sewer |
| C. | R.C. sewer |
| D. | Lead sewer |
| Answer» E. | |
| 175. |
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter |
| A. | Less than 0.01 mm |
| B. | Less than 0.05 mm |
| C. | Less than 0.1 mm |
| D. | Greater than 0.1 mm |
| Answer» E. | |
| 176. |
Hydraulic mean radius is |
| A. | Mean radius of sewer |
| B. | Difference in heads between two points in circular pipes |
| C. | Mean of radii in a pipe line of varying cross -sections |
| D. | Cross-sectional area/wetted perimeter |
| Answer» E. | |
| 177. |
In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is |
| A. | D/1 |
| B. | D/2 |
| C. | D/3 |
| D. | D/4 |
| Answer» E. | |
| 178. |
For providing an Indian type W.C., the R.C.C. slabs in the toilet portion |
| A. | Should be sunk by 20 cm |
| B. | Should be kept 20 cm above the adjacent portion |
| C. | Should be sunk by 50 cm |
| D. | Need not be sunk |
| Answer» D. Need not be sunk | |
| 179. |
The recommended detention period for grit chambers is |
| A. | 1 minute |
| B. | 2 minutes |
| C. | 3 minutes |
| D. | 5 minutes |
| Answer» B. 2 minutes | |
| 180. |
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. | |
| 181. |
The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is |
| A. | 30 minutes |
| B. | 1 hour |
| C. | 1 hour and 30 minutes |
| D. | 2 hours |
| Answer» E. | |
| 182. |
15 cumecs, the depth d and width are related by For drains up to |
| A. | d = 0.2 B |
| B. | d = 0.5 B |
| C. | B = 0.2 d |
| D. | B = 0.5 d |
| Answer» C. B = 0.2 d | |
| 183. |
R.M.O. expenses include |
| A. | Running expenses |
| B. | Maintenance expenses |
| C. | Operation expenses |
| D. | All the above |
| Answer» E. | |
| 184. |
Which one of the following part of human body withstands minimum radiation? |
| A. | Thyroid |
| B. | Kidneys |
| C. | Eyes |
| D. | Ovaries/testis |
| Answer» E. | |
| 185. |
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 | |
| 186. |
In septic tanks, |
| A. | Free board of 0.3 m may be provided |
| B. | The baffles or tees are extended up to top level of scum |
| C. | The clear space between the baffle top and covering slab is about 7.5 cm |
| D. | All the above |
| Answer» E. | |
| 187. |
No treatment of the sewage is given if dilution factor is |
| A. | Less than 150 |
| B. | Between 150 to 200 |
| C. | Between 200 to 300 |
| D. | More than 500 |
| Answer» E. | |
| 188. |
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. | |
| 189. |
Sludge banks are formed if sewage is disposed of in |
| A. | Rivers |
| B. | Seas |
| C. | Lakes |
| D. | None of these |
| Answer» C. Lakes | |
| 190. |
The gas which may cause explosion in sewers, is |
| A. | Carbondioxide |
| B. | Methane |
| C. | Ammonia |
| D. | Carbon monoxide |
| Answer» C. Ammonia | |
| 191. |
A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is |
| A. | 100 |
| B. | 1000 |
| C. | 5000 |
| D. | 10000 |
| Answer» E. | |
| 192. |
In a sludge tank, the gas mainly produced, is |
| A. | Oxygen |
| B. | Nitrogen |
| C. | Hydrogen |
| D. | Carbon dioxide |
| Answer» E. | |
| 193. |
The most widely used pump for lifting sewage is |
| A. | Centrifugal pump |
| B. | Reciprocating pump |
| C. | Pneumatic ejector |
| D. | Air pressure pump |
| Answer» B. Reciprocating pump | |
| 194. |
A drop manhole is provided if |
| A. | A sewer drops from a height |
| B. | A branch sewer joins the main sewer at higher level |
| C. | A lamp is inserted to check obstruction |
| D. | None of these |
| Answer» C. A lamp is inserted to check obstruction | |
| 195. |
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. | |
| 196. |
‘Cowl’ is provided at |
| A. | Lower end of ventilating column |
| B. | Upper end of ventilating column |
| C. | Upper end of the manhole |
| D. | First step in manhole |
| Answer» C. Upper end of the manhole | |
| 197. |
In sewers the velocity of flow should not be |
| A. | More than the self-cleansing velocity |
| B. | Less than the self-cleansing velocity |
| C. | Less than 10 m/sec |
| D. | More than 20 m/sec |
| Answer» C. Less than 10 m/sec | |
| 198. |
Cement concrete sewers are only suitable if non-scouring velocity is between |
| A. | 2.5 to 3.0 m/sec |
| B. | 3.0 to 4.0 m/sec |
| C. | 3.5 to 4.5 m/sec |
| D. | 4.5 to 5.5 m/sec |
| Answer» B. 3.0 to 4.0 m/sec | |
| 199. |
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. | |
| 200. |
Skimming tanks are |
| A. | Used to remove the grease and oil |
| B. | Those from which sludge is skimmed out |
| C. | Tanks provided with self- cleansing screens |
| D. | Improved version of grit chambers |
| Answer» B. Those from which sludge is skimmed out | |