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MCQOPTIONS
This section includes 5814 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 4351. |
The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock's law, is |
| A. | <img src="/_files/images/civil-engineering/waste-water-engineering/190-9.161-1.png"> |
| B. | <img src="/_files/images/civil-engineering/waste-water-engineering/190-9.161-2.png"> |
| C. | <img src="/_files/images/civil-engineering/waste-water-engineering/190-9.161-3.png"> |
| D. | <img src="/_files/images/civil-engineering/waste-water-engineering/190-9.161-4.png"> |
| Answer» C. <img src="/_files/images/civil-engineering/waste-water-engineering/190-9.161-3.png"> | |
| 4352. |
The formula used for determining flow velocities in sewers, is known as |
| A. | Chezy's formula |
| B. | Bazin's formula |
| C. | Kutter's formula |
| D. | Manning's formula. |
| Answer» E. | |
| 4353. |
The sewage treatment units in which anaerobic decomposition of organic matter is used, are called |
| A. | imhoff tanks |
| B. | trickling filters |
| C. | sludge sedimentation tanks |
| D. | none of these. |
| Answer» C. sludge sedimentation tanks | |
| 4354. |
The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be |
| A. | 0.9 cm |
| B. | 1.2 m |
| C. | 1.5 m |
| D. | > 1.5 m. |
| Answer» E. | |
| 4355. |
You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at |
| A. | full depth |
| B. | half full |
| C. | two third full |
| D. | three fourth full. |
| Answer» C. two third full | |
| 4356. |
The rate of accumulation of sludge per person per year, is |
| A. | 10 litres |
| B. | 15 litres |
| C. | 20 litres |
| D. | 25 litres |
| E. | 30 litres. |
| Answer» D. 25 litres | |
| 4357. |
For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed |
| A. | 1.5 |
| B. | 2.0 |
| C. | 2.5 |
| D. | 3.0 |
| Answer» C. 2.5 | |
| 4358. |
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 | |
| 4359. |
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. | |
| 4360. |
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 | |
| 4361. |
The ratio of depths at partial flow with central angle and at full flow of a sewer, is |
| A. | <img src="/_files/images/civil-engineering/waste-water-engineering/182-9.49-1.png"> |
| B. | <img src="/_files/images/civil-engineering/waste-water-engineering/182-9.49-2.png"> |
| C. | <img src="/_files/images/civil-engineering/waste-water-engineering/182-9.49-3.png"> |
| D. | <img src="/_files/images/civil-engineering/waste-water-engineering/182-9.49-4.png"> |
| E. | <img src="/_files/images/civil-engineering/waste-water-engineering/182-9.49-5.png"> |
| Answer» D. <img src="/_files/images/civil-engineering/waste-water-engineering/182-9.49-4.png"> | |
| 4362. |
The normal values of over flow rates for sedimentation tanks using coagulent, 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 |
| E. | none of these. |
| Answer» D. 80, 000 to 100, 000 litres/sqm/day | |
| 4363. |
The quantity of liquid waste which flows in sewers during the period of rainfall, is known |
| A. | sanitary sewage |
| B. | industrial waste |
| C. | storm sewage |
| D. | none of these. |
| Answer» D. none of these. | |
| 4364. |
Pick up the incorrect size of stone ware sewers |
| A. | 52.5 cm |
| B. | 67.5 cm |
| C. | 82.5 cm |
| D. | 90 cm |
| E. | none of these. |
| Answer» F. | |
| 4365. |
Pathogens (or pathogentic bacterias) in water may cause |
| A. | typhoid |
| B. | cholera |
| C. | dysentery |
| D. | infectious hepatitis |
| E. | all the above. |
| Answer» F. | |
| 4366. |
Before discharging the foul sewage into rivers, it is generally treated by |
| A. | screening |
| B. | sedimentation |
| C. | oxidation |
| D. | sludge digestion and disinfection |
| E. | all the above. |
| Answer» F. | |
| 4367. |
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. | |
| 4368. |
In 1000 kg of sewage, the total solids approximate |
| A. | 0.5 to 1.0 kg |
| B. | 1 kg to 2.0 kg |
| C. | 5 kg to 7.5 kg |
| D. | 7.5 kg to 10 kg. |
| Answer» B. 1 kg to 2.0 kg | |
| 4369. |
In detritus tanks, |
| A. | flow velocity is kept 0.09 m/sec |
| B. | detention period is kept 3 to 4 minutes |
| C. | organic and inorganic materials are separated |
| D. | all the above. |
| Answer» E. | |
| 4370. |
The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is |
| A. | 5 m |
| B. | 5.5 m |
| C. | 6 m |
| D. | 6.5 m |
| E. | 7 m. |
| Answer» F. | |
| 4371. |
In areas where rainy season is limited to a few months, the type of sewerage system recommended is |
| A. | combined system |
| B. | partially separate system |
| C. | separate system |
| D. | none of these. |
| Answer» D. none of these. | |
| 4372. |
The settlement of a particle in sedimentation tank, is affected by |
| A. | velocity of flow |
| B. | viscosity of water |
| C. | size and shape of solid |
| D. | specific gravity of solid |
| E. | all the above. |
| Answer» F. | |
| 4373. |
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. | |
| 4374. |
Oxidation process results in the formation of |
| A. | carbon dioxide |
| B. | nitrates |
| C. | sulphates |
| D. | all the above. |
| Answer» E. | |
| 4375. |
Dry weather flow is : |
| A. | average daily rate of flow |
| B. | average monthly rate of flow |
| C. | average annual rate of flow |
| D. | water supply allowance per capita |
| E. | none of these. |
| Answer» E. none of these. | |
| 4376. |
In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient, |
| A. | is only provided |
| B. | is doubled |
| C. | is trebled |
| D. | is not enough. |
| Answer» C. is trebled | |
| 4377. |
In trickling filter, B.O.D. is reduced to |
| A. | 30 to 40% |
| B. | 40 to 60% |
| C. | 60 to 80% |
| D. | 80 to 90% |
| E. | 95%. |
| Answer» D. 80 to 90% | |
| 4378. |
Which one of the following gases is most significant as air pollutant |
| A. | Carbondioxide |
| B. | Oxygen |
| C. | Nitrogen |
| D. | Sulphurdioxide. |
| Answer» E. | |
| 4379. |
The rainfall at any place may be determined by |
| A. | its intensity |
| B. | its direction |
| C. | its frequency |
| D. | all the above. |
| Answer» E. | |
| 4380. |
Lead caulked joints are used for laying |
| A. | stone ware pipes |
| B. | earthern ware pipes |
| C. | C.I. pipes |
| D. | G.I. pipes. |
| Answer» C. C.I. pipes | |
| 4381. |
For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed |
| A. | 1.5 |
| B. | 2.0 |
| C. | 2.5 |
| D. | 3.0 |
| E. | 3.5 |
| Answer» B. 2.0 | |
| 4382. |
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. | |
| 4383. |
For 3.25 x 10-2 cumecs discharging from a well, a pump is installed to lift water against a total head of 30 m. The minimum required horse power, is |
| A. | 10 H.P. |
| B. | 15 H.P. |
| C. | 18 H.P. |
| D. | 20 H.P. |
| E. | 25 H.P. |
| Answer» E. 25 H.P. | |
| 4384. |
The value of Chezy's constant is used in |
| A. | Chezy's formula |
| B. | Bazin's formula |
| C. | Kutter's formula |
| D. | Manning's formula. |
| Answer» C. Kutter's formula | |
| 4385. |
For detecting the nitrates in sewage, the colour may be developed by adding |
| A. | Pottassium permanganate |
| B. | Sulphuric acid and napthamine |
| C. | Phenol-di-sulphuric acid and pottassium hydroxide |
| D. | None of these. |
| Answer» D. None of these. | |
| 4386. |
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 Bruge |
| C. | William-Hazen |
| D. | Kutter. |
| Answer» C. William-Hazen | |
| 4387. |
For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of |
| A. | 100 cm |
| B. | 120 cm |
| C. | 140 cm |
| D. | 160 cm |
| E. | 180 cm. |
| Answer» E. 180 cm. | |
| 4388. |
The factor responsible for purification of sewage in river is |
| A. | Hydrology |
| B. | Dissolved oxygen in water |
| C. | Temperature |
| D. | Turbulence |
| E. | All the above. |
| Answer» F. | |
| 4389. |
If q is the average sewage flow from a city of population P, the maximum sewage flow |
| A. | <img src="/_files/images/civil-engineering/waste-water-engineering/180-9.16-1.png"> |
| B. | <img src="/_files/images/civil-engineering/waste-water-engineering/180-9.16-2.png"> |
| C. | <img src="/_files/images/civil-engineering/waste-water-engineering/180-9.16-3.png"> |
| D. | <img src="/_files/images/civil-engineering/waste-water-engineering/180-9.16-4.png"> |
| Answer» D. <img src="/_files/images/civil-engineering/waste-water-engineering/180-9.16-4.png"> | |
| 4390. |
The difference in the reservoir level and the lowest point of the water mains is 180 m. The expected pressure due to water hammer is 7.5 kg/cm2 in a pressure conduit of diameter 1 m. Assuming the efficiency of the riveted joints of the pipe as 0.6 and minimum cover 3 mm for corrosion, the thickness of the pipe materials, is |
| A. | 10 mm |
| B. | 15 mm |
| C. | 20 mm |
| D. | 25 mm |
| E. | 30 mm. |
| Answer» D. 25 mm | |
| 4391. |
The factor for the selection of pumping station site, is |
| A. | distance of the source of contamination or pollution |
| B. | height above the H.F.L. of the river |
| C. | future expansion |
| D. | proximity of the site from the railway station |
| E. | all the above. |
| Answer» F. | |
| 4392. |
At break point of chlorination, |
| A. | chlorine is used to oxidise |
| B. | residual chloride is zero |
| C. | residual chloride is maximum |
| D. | residual chlorine reappears. |
| Answer» E. | |
| 4393. |
Low turbidity of water is detected by |
| A. | Turbidity tube |
| B. | Jackson turbidity meter |
| C. | Baylis turbidimeter |
| D. | Hellipe turbidimeter |
| E. | None of these. |
| Answer» D. Hellipe turbidimeter | |
| 4394. |
Pick up the incorrect statement from the following. The source of surface water is from |
| A. | streams and rivers |
| B. | storage reservoirs |
| C. | springs |
| D. | ponds and lakes |
| E. | none of these. |
| Answer» D. ponds and lakes | |
| 4395. |
For the prediction of future population of a city, the factor to be considered, is |
| A. | births |
| B. | deaths |
| C. | migrants |
| D. | all the above. |
| Answer» E. | |
| 4396. |
Water may not contain much impurities if its source is |
| A. | reservoirs |
| B. | stream flowing in plains |
| C. | lakes in lower regions |
| D. | spring along hill slopes |
| E. | none of these. |
| Answer» E. none of these. | |
| 4397. |
If P is population of a city in thousands and Q is fire demand in litres per minute, for proper estimate of water, the Empirical formula is suggested by |
| A. | National Board of fire under-writers |
| B. | Freeman |
| C. | Kuichling |
| D. | None of these. |
| Answer» C. Kuichling | |
| 4398. |
The pH value of water fit for drinking, is |
| A. | 13 |
| B. | 11 |
| C. | 9 |
| D. | 7 |
| E. | 5 |
| Answer» E. 5 | |
| 4399. |
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 |
| E. | none of these. |
| Answer» E. none of these. | |
| 4400. |
Estimates of a water supply project depends upon the rate of water supply per capita consumption and probable population estimated at the end of the design period of |
| A. | 5 to 10 years |
| B. | 10 to 15 years |
| C. | 15 to 20 years |
| D. | 20 to 30 years |
| E. | 25 years. |
| Answer» E. 25 years. | |