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.
| 251. |
As compared to fresh river water, sea water contains oxygen |
| A. | 10% less |
| B. | 20% less |
| C. | 10% more |
| D. | 20% more |
| Answer» C. 10% more | |
| 252. |
For evaporation and measurement of settable solids, the apparatus used, is |
| A. | A jar |
| B. | A breaker |
| C. | A test tube |
| D. | An Imhoff cone |
| Answer» E. | |
| 253. |
The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is |
| A. | 213.5 cm/sec |
| B. | 313.5 cm/sec |
| C. | 413.5 cm/sec |
| D. | 500 cm/sec |
| Answer» C. 413.5 cm/sec | |
| 254. |
The small sewers are cleaned by |
| A. | Flushing |
| B. | Cane rodding |
| C. | Wooden pills |
| D. | None of these |
| Answer» B. Cane rodding | |
| 255. |
pH value of sludge during alkaline regression stage, is |
| A. | More than 7 |
| B. | Less than 7 |
| C. | Less than 6 |
| D. | More than 6 |
| Answer» B. Less than 7 | |
| 256. |
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° | |
| 257. |
Sewer manholes are generally provided at |
| A. | The change of gradient |
| B. | The change of direction |
| C. | The junctions of sewers |
| D. | All of these |
| Answer» E. | |
| 258. |
To maintain aerobic biological activity, the moisture content of the compost mass should be about |
| A. | 45 % |
| B. | 50 % |
| C. | 55 % |
| D. | 60 % |
| Answer» D. 60 % | |
| 259. |
The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is |
| A. | 100 cm |
| B. | 110 cm |
| C. | 120 cm |
| D. | 150 cm |
| Answer» D. 150 cm | |
| 260. |
The rate of accumulation of sludge per person per year, is |
| A. | 10 litres |
| B. | 15 litres |
| C. | 20 litres |
| D. | 25 litres |
| Answer» D. 25 litres | |
| 261. |
Setting out the alignments of sewers may start from |
| A. | City |
| B. | Out-fall |
| C. | Tail end |
| D. | Any point |
| Answer» D. Any point | |
| 262. |
Design period of 40 to 50 years is adopted for |
| A. | Branch sewers |
| B. | Main sewers |
| C. | Trunk sewers |
| D. | All the above |
| Answer» E. | |
| 263. |
The normal value of over flow rates for plain primary sedimentation tanks, ranges between |
| A. | 25,000 to 35,000 litres/sqm/day |
| B. | 40,000 to 50,000 litres/sqm/day |
| C. | 50,000 to 60,000 litres/sqm/day |
| D. | 80,000 to 100,000 litres/sqm/day |
| Answer» C. 50,000 to 60,000 litres/sqm/day | |
| 264. |
The normal values of over flow rates for secondary sedimentation tanks, ranges between |
| A. | 25,000 to 35,000 litres/sqm/day |
| B. | 40,000 to 50,000 litres/sqm/day |
| C. | 50,000 to 60,000 litres/sqm/day |
| D. | 80,000 to 10,000 litres/sqm/day |
| Answer» B. 40,000 to 50,000 litres/sqm/day | |
| 265. |
Imhoff cone is used to measure |
| A. | Total organic solids |
| B. | Total solids |
| C. | Total in organic solids |
| D. | Settleable solids |
| Answer» E. | |
| 266. |
Pick up the incorrect statement from the following for allowing workers to enter sewers |
| A. | The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes |
| B. | Proper tests for the presence of poisonous gases must be carried out |
| C. | The men entering the manhole should be advised to smoke in the sewer |
| D. | Warning signals should be erected |
| Answer» D. Warning signals should be erected | |
| 267. |
A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of |
| A. | Carbondioxide gas |
| B. | Hydrogen sulphide gas |
| C. | Methane gas |
| D. | Petrol vapours |
| Answer» D. Petrol vapours | |
| 268. |
If is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is |
| A. | 1.250 D |
| B. | 1.350 D |
| C. | 1.425 D |
| D. | 1.625 D |
| Answer» E. | |
| 269. |
The pH value of fresh sewage is usually |
| A. | Equal to 7 |
| B. | More than 7 |
| C. | Less than 7 |
| D. | Equal to zero |
| Answer» C. Less than 7 | |
| 270. |
In case of sewer lines |
| A. | Water test is carried out to check water tightness of the joints |
| B. | Test for straightness is carried out with the help of a lamp and mirror |
| C. | Obstruction test is carried out with the help of smooth ball of diameter 13 mm |
| D. | All the above |
| Answer» E. | |
| 271. |
The screens are fixed |
| A. | Perpendicular to the direction of flow |
| B. | Parallel to the direction of flow |
| C. | At an angle 30° to 60° to the direction of flow |
| D. | None of these |
| Answer» D. None of these | |
| 272. |
The stone ware sewers |
| A. | Are used for carrying sewage and drainage from houses |
| B. | Are manufactured from clays and shale |
| C. | After casting are dried and burnt at temperature 150°C, 700°C and 1200°C |
| D. | All the above |
| Answer» E. | |
| 273. |
Pick up the incorrect size of stone ware sewers |
| A. | 52.5 cm |
| B. | 67.5 cm |
| C. | 82.5 cm |
| D. | None of these |
| Answer» E. | |
| 274. |
If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is |
| A. | 1 in 60 |
| B. | 1 in 100 |
| C. | 1 in 120 |
| D. | None of these |
| Answer» C. 1 in 120 | |
| 275. |
The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known |
| A. | House sewer |
| B. | Lateral sewer |
| C. | Branch sewer |
| D. | Sewer outfall |
| Answer» E. | |
| 276. |
For efficient working of a sewer, it must be ensured that |
| A. | Minimum velocity of 0.45 m/sec, is maintained at its minimum flow |
| B. | A maximum velocity of 0.90 m/sec, is maintained at its maximum flow |
| C. | Both (A) and (B) |
| D. | Neither (A) nor (B) |
| Answer» D. Neither (A) nor (B) | |
| 277. |
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 | |
| 278. |
A rain sanitary sewer is constructed to carry |
| A. | Sanitary sewage |
| B. | Storm sewage |
| C. | Surface water |
| D. | Ground water |
| Answer» C. Surface water | |
| 279. |
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is |
| A. | 50 mg/l |
| B. | 100 mg/l |
| C. | 150 mg/l |
| D. | 250 mg/l |
| Answer» E. | |
| 280. |
If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is |
| A. | 200 ppm |
| B. | 225 ppm |
| C. | 250 ppm |
| D. | None of these |
| Answer» D. None of these | |
| 281. |
If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is |
| A. | 100 mg/l |
| B. | 200 mg/l |
| C. | 300 mg/l |
| D. | 400 mg/l |
| Answer» E. | |
| 282. |
In case of Imhoff tanks, |
| A. | The shape is rectangular |
| B. | Detention period is 2 hours |
| C. | The velocity of flow is restricted to 0.30 m/minute |
| D. | All the above |
| Answer» E. | |
| 283. |
Dilution method of disposing of sewage, is not preferred to |
| A. | When sewage is fresh |
| B. | When diluting water has high dissolved oxygen content |
| C. | When diluting water is used for water supply near the point of sewage disposed |
| D. | When the diluting water is having flow currents |
| Answer» D. When the diluting water is having flow currents | |
| 284. |
The minimum recommended diameter of sewers, is |
| A. | 5 cm |
| B. | 10 cm |
| C. | 15 cm |
| D. | 20 cm |
| Answer» D. 20 cm | |
| 285. |
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 | |
| 286. |
The normal values of over flow rates for sedimentation tanks using coagulant, ranges between |
| A. | 25,000 to 35,000 litres/sqm/day |
| B. | 40,000 to 50,000 litres/sqm/day |
| C. | 50,000 to 60,000 litres/sqm/day |
| D. | 80,000 to 100,000 litres/sqm/day |
| Answer» D. 80,000 to 100,000 litres/sqm/day | |
| 287. |
The sewers |
| A. | Must be of adequate size to avoid over flow |
| B. | Must flow under gravity ½ to ¾ full |
| C. | Must be laid at least 2 to 3 m deep to collect /water from the basements |
| D. | All the above |
| Answer» E. | |
| 288. |
Lead acetate test in sewer manhole is done to test the presence of |
| A. | Methane gas |
| B. | Hydrogen sulphide |
| C. | Carbondioxide gas |
| D. | Diesel vapours |
| Answer» C. Carbondioxide gas | |
| 289. |
depends upon 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. | |
| 290. |
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. | |
| 291. |
In septic tanks, decomposition of organic bacteria, is done by |
| A. | Anaerobic bacteria |
| B. | Aerobic bacteria |
| C. | Both types of bacterias |
| D. | None of these |
| Answer» B. Aerobic bacteria | |
| 292. |
During preliminary treatment of a sewage |
| A. | Oil and grease are removed from skimming tanks |
| B. | Floating materials are removed by screening |
| C. | Girt and sand are removed by girt chambers |
| D. | All the above |
| Answer» E. | |
| 293. |
Aerobic activity is maximum |
| A. | In freshly produced sewage |
| B. | At sewer pipes |
| C. | In sewer treatment plants |
| D. | None of these |
| Answer» B. At sewer pipes | |
| 294. |
Which one of the following tests is used for testing sewer pipes? |
| A. | Water test |
| B. | Ball test |
| C. | Mirror test |
| D. | All of these |
| Answer» E. | |
| 295. |
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 | |
| 296. |
The sewer pipes |
| A. | Carry sewage as gravity conduits |
| B. | Are designed for generating self-cleansing velocities at different discharge |
| C. | Should resist the wear and tear caused due to abrasion |
| D. | All the above |
| Answer» E. | |
| 297. |
The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is |
| A. | 1 in 100 upward |
| B. | 1 in 500 upward |
| C. | 1 in 100 downward |
| D. | 1 in 503 upward |
| Answer» D. 1 in 503 upward | |
| 298. |
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is |
| A. | 2 hours |
| B. | 4 hours |
| C. | 6 hours |
| D. | 8 hours |
| Answer» E. | |
| 299. |
The most effective arrangement for diverting excess storm water into a natural drainage, is |
| A. | Leaping weir |
| B. | Overflow weir |
| C. | Siphon spill way |
| D. | None of these |
| Answer» D. None of these | |
| 300. |
At the junction of sewers |
| A. | Top of smaller sewer is kept lower |
| B. | Top of larger sewer is kept lower |
| C. | Tops of both the sewers are at the same level |
| D. | None of these |
| Answer» E. | |