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.
| 451. |
A sewer running partially full and hurried with back filled, fails in compression due to |
| A. | weight of the pipe |
| B. | weight of the back fill |
| C. | superimposed traffic loads |
| D. | all the above. |
| Answer» E. | |
| 452. |
If D 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. | |
| 453. |
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. | |
| 454. |
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. | |
| 455. |
The average temperature of sewage in India, is |
| A. | 10°C |
| B. | 15°C |
| C. | 20°C |
| D. | 25°C |
| Answer» D. 25¬∞C | |
| 456. |
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 | |
| 457. |
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 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. | |
| 458. |
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. | |
| 459. |
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. | |
| 460. |
Antisyphonage pipe is fitted |
| A. | at the end of septic tanks |
| B. | on manholes |
| C. | with a W.C. trap |
| D. | at the beginning of sewer line. |
| Answer» D. at the beginning of sewer line. | |
| 461. |
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 | |
| 462. |
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. | |
| 463. |
The sludge does not contain waste water from |
| A. | bath rooms |
| B. | wash basins |
| C. | kitchen sinks |
| D. | toilets. |
| Answer» E. | |
| 464. |
The standard B.O.D. of water is taken for |
| A. | 1 day |
| B. | 2 days |
| C. | 3 days |
| D. | 5 days |
| Answer» E. | |
| 465. |
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. | |
| 466. |
If the pH value of sewage is 7 |
| A. | it is acidic |
| B. | it is alkaline |
| C. | it is neutral |
| D. | none of these. |
| Answer» D. none of these. | |
| 467. |
The use of coarse screens for the disposal of sewage, may be dispensed with by |
| A. | comminutor |
| B. | shredder |
| C. | both (a) and (b) |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 468. |
Pathogens (or pathogentic bacterias) in water may cause |
| A. | typhoid |
| B. | cholera |
| C. | dysentery |
| D. | infectious hepatitis |
| Answer» E. | |
| 469. |
It is customary to design a sewer for D.W.F. on the basis of |
| A. | average demand |
| B. | twice the average demand |
| C. | thrice the average demand |
| D. | four times the average demand. |
| Answer» D. four times the average demand. | |
| 470. |
If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains |
| A. | Hydrogen sulphide |
| B. | Carbon dioxide |
| C. | Methane |
| D. | Oxygen |
| Answer» D. Oxygen | |
| 471. |
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. | |
| 472. |
The sewer which transports the sewage to the point of treatment, is called |
| A. | house sewer |
| B. | out-fall sewer |
| C. | branch sewer |
| D. | lateral |
| Answer» C. branch sewer | |
| 473. |
In sewers designed with self cleansing velocity, |
| A. | the bottom is silted |
| B. | the bottom is scoured |
| C. | both silting and scouring occur at the bottom |
| D. | neither silting nor scouring occurs at the bottom. |
| Answer» E. | |
| 474. |
Stoneware sewers are available in size |
| A. | 10 cm |
| B. | 15 cm |
| C. | 20 cm |
| D. | 25 cm |
| Answer» E. | |
| 475. |
The suitable cross-section of sewers to carry combined flow, is |
| A. | circular |
| B. | egg shaped |
| C. | rectangular |
| D. | horse shoe shaped. |
| Answer» C. rectangular | |
| 476. |
The sewerage system consists of |
| A. | house sewer |
| B. | lateral sewer |
| C. | branch sewer |
| D. | main sewer |
| Answer» E. | |
| 477. |
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 | |
| 478. |
If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is |
| A. | 1.39 m |
| B. | 1.49 m |
| C. | 1.59 m |
| D. | 1.69 m |
| Answer» E. | |
| 479. |
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 | |
| 480. |
Which one of the following part of human body withstands minimum radiation |
| A. | thyroid |
| B. | kidneys |
| C. | eyes |
| D. | ovaries/testis. |
| Answer» E. | |
| 481. |
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. | |
| 482. |
The sewer which resists sulphide corrosion, is |
| A. | Brick sewer |
| B. | Cast iron sewer |
| C. | R.C.C. sewer |
| D. | Lead sewer |
| Answer» E. | |
| 483. |
The pH value of sewage is determined with the help of |
| A. | Imhoff Cone |
| B. | turbidimeter |
| C. | potentiometer |
| D. | none of these. |
| Answer» D. none of these. | |
| 484. |
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. | |
| 485. |
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). | |
| 486. |
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. | |
| 487. |
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 |
| Answer» E. | |
| 488. |
For detecting the nitrites in the sewage, the matching colour may be developed by adding |
| A. | Pottassium permanganate |
| B. | Sulphuric acid and napthamine |
| C. | Phenol-di-sulphuric acid pottassium hydroxide |
| D. | None of these. |
| Answer» C. Phenol-di-sulphuric acid pottassium hydroxide | |
| 489. |
Water content of sewage is about |
| A. | 0.9 |
| B. | 0.95 |
| C. | 0.99 |
| D. | 9.9%. |
| Answer» E. | |
| 490. |
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. | |
| 491. |
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 | |
| 492. |
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. | |
| 493. |
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 | |
| 494. |
If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is |
| A. | 50 ppm |
| B. | 100 ppm |
| C. | 150 ppm |
| D. | 200 ppm |
| Answer» E. | |
| 495. |
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. | |
| 496. |
Which one of the following resists hydrogen sulphide corrosion |
| A. | R.C.C. |
| B. | Glazed stone wares |
| C. | Asbestos cement |
| D. | Glazed ware. |
| Answer» E. | |
| 497. |
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 |
| Answer» D. 80, 000 to 100, 000 litres/sqm/day | |
| 498. |
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. | |
| 499. |
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.) | |
| 500. |
Imhoff cone is used to determine |
| A. | settlable solids |
| B. | suspended solids |
| C. | dissolved solids |
| D. | none of these. |
| Answer» B. suspended solids | |