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.
| 1. |
If is the diameter of a circular sewer and is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is |
| A. | = 0.64 |
| B. | = 0.74 |
| C. | = 0.84 |
| D. | = 0.94 |
| E. | . |
| Answer» D. = 0.94 | |
| 2. |
The detention time () 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. | |
| 3. |
If is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is |
| A. | 1.250 |
| B. | 1.350 |
| C. | 1.425 |
| D. | 1.625 |
| E. | . |
| Answer» E. . | |
| 4. |
For estimating the peak run off the rational formula = 0.0278 KpA was evolved by |
| A. | Kinchling |
| B. | Lloyd Davis |
| C. | Frubling |
| D. | all the above. |
| Answer» E. | |
| 5. |
If the depth of flow in a circular sewer is 1/4th of its diameter , the wetted perimeter is |
| A. | π |
| B. | . |
| Answer» D. | |
| 6. |
The Chezy's constant in the formula = depends upon |
| A. | size of the sewer |
| B. | shape of the sewer |
| C. | roughness of sewer surface |
| D. | hydraulic characteristics of sewer |
| E. | all the above. |
| Answer» F. | |
| 7. |
For the open drain ( = 0.025) shown in the below figure, the discharge is |
| A. | 26.88 cumecs |
| B. | 27.88 cumecs |
| C. | 28.88 cumecs |
| D. | 29.88 cumecs. |
| Answer» D. 29.88 cumecs. | |
| 8. |
5 days-biochemical oxygen demand (BOD) is taken at a temperature of |
| A. | 0°C |
| B. | 15°C |
| C. | 20°C |
| D. | 25°C. |
| Answer» D. 25°C. | |
| 9. |
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 | |
| 10. |
For a circular sewer of diameter running partially full with central angle α, |
| A. | all the above. |
| Answer» F. | |
| 11. |
The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( = 0.85), the 40% area is unpaved streets ( = 0.20) and the remaining is wooded areas ( = 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. | |
| 12. |
Boussinesq's equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is |
| A. | none of these. |
| Answer» B. | |
| 13. |
Hazin's formula 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. | |
| 14. |
rd or th extra space is left in sewer pipes at maximum discharge for |
| A. | low estimates of the average and maximum flows |
| B. | large scale infiltration of storm water |
| C. | unexpected increase in population |
| D. | all the above. |
| Answer» E. | |
| 15. |
If is the rugosity coefficient, is the hydraulic depth, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula evolved by |
| A. | Chezy |
| B. | Manning |
| C. | Bazin |
| D. | Kutter. |
| Answer» C. Bazin | |
| 16. |
For drains up to 15 cumecs, the depth and width are related by |
| A. | = 0.2 |
| B. | = 0.5 |
| C. | = 0.2 |
| D. | = |
| E. | . |
| Answer» C. = 0.2 | |
| 17. |
If the discharge of a sewer running half is 628 1.p.s., = 0.001, and = 0.010, the diameter of the sewer, is |
| A. | 1.39 m |
| B. | 1.49 m |
| C. | 1.59 m |
| D. | 1.69 m |
| E. | 1.79 m. |
| Answer» E. 1.79 m. | |
| 18. |
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. | |
| 19. |
The formula which accepts the value of rugosity coefficient = 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 | |
| 20. |
The value of Chezy's constant is used in |
| A. | Chezy's formula |
| B. | Bazin's formula |
| C. | Kutter's |
| D. | Manning's formula. |
| Answer» D. Manning's formula. | |
| 21. |
For the COD test of sewage, organic matter is oxidised by KCr0 in the presence of |
| A. | H |
| B. | SO |
| C. | HNO |
| D. | HCl |
| E. | none of these. |
| Answer» B. SO | |
| 22. |
If is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is |
| A. | 1.25 |
| B. | 1.5 |
| C. | 1.75 |
| D. | 2 |
| E. | . |
| Answer» D. 2 | |
| 23. |
Which one of the following gases is most significant as air pollutant ? |
| A. | Carbondioxide |
| B. | Oxygen |
| C. | Nitrogen |
| D. | Sulphur-dioxide |
| Answer» E. | |
| 24. |
Which one of the following part of human body withstands minimum radiation ? |
| A. | Thyroid |
| B. | Kidneys |
| C. | Eyes |
| D. | Ovaries/testis |
| Answer» E. | |
| 25. |
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. | |
| 26. |
Which one of the following statements regarding septic tanks is wrong ? |
| A. | A gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided |
| B. | The outlet invert level is kept 5 to 7.5 cm below the inlet invert level |
| C. | The minimum width of septic level is 90 cm |
| D. | The depth of tank is kept equal to its width |
| Answer» E. | |
| 27. |
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. | |
| 28. |
With self cleansing velocity in sewers___________________? |
| A. | Silting occurs at bottom |
| B. | Scouring occurs at bottom |
| C. | Both silting and scouring occur at bottom |
| D. | Neither silting nor scouring occurs at bottom |
| Answer» E. | |
| 29. |
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 | |
| 30. |
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 | |
| 31. |
When drainage to sewage ratio is 20, the peak dry weather flow is_______________? |
| A. | 20% of the design discharge |
| B. | Slightly less than 5% of the design discharge |
| C. | Slightly more than 5% of the design discharge |
| D. | None of these |
| Answer» C. Slightly more than 5% of the design discharge | |
| 32. |
weight of water, the hydraulic mean depth of the sewer and the bed slope w is the unit of the sewer, then the tractive force exerted by flowing water, is________________________? |
| A. | w r S S |
| B. | w r1/2 |
| C. | w r S |
| D. | w r2/3 |
| Answer» B. w r1/2 | |
| 33. |
Water content of sewage is about___________________? |
| A. | 90 % |
| B. | 95 % |
| C. | 99 % |
| D. | 9.9 % |
| Answer» E. | |
| 34. |
Ventilating shafts are provided to a sewer line at every__________________? |
| A. | 100 m |
| B. | 150 m |
| C. | 200 m |
| D. | 300 m |
| Answer» E. | |
| 35. |
Traps_________________? |
| A. | Are water seals which prevent the entry of foul gases |
| B. | Are used to trap the rats entering sewers |
| C. | Dissolve the foul gases |
| D. | Create symphonic action to increase the quick disposal of sewerage |
| Answer» B. Are used to trap the rats entering sewers | |
| 36. |
To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of_______________? |
| A. | Hydrochloric acid |
| B. | Sulphuric acid |
| C. | Nitric acid |
| D. | Citric acid |
| Answer» C. Nitric acid | |
| 37. |
To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is_________________? |
| A. | 0.50 m/sec |
| B. | 0.60 m/sec |
| C. | 0.70 m/sec |
| D. | 0.75 m/sec |
| Answer» E. | |
| 38. |
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 % | |
| 39. |
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. | 6.5 m |
| D. | 7 m |
| Answer» E. | |
| 40. |
The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is______________? |
| A. | 0.68 m |
| B. | 0.88 m |
| C. | 1.36 m |
| D. | 1.76 m |
| Answer» D. 1.76 m | |
| 41. |
The water carried sewerage system removes__________________? |
| A. | Domestic sewage |
| B. | Industrial sewage |
| C. | Storm sewage |
| D. | All the above |
| Answer» E. | |
| 42. |
The value of Chezy’s constant C = 157.6/(1.81 + K/ ) is used in__________________? |
| A. | Chezy’s formula |
| B. | Bazin’s formula |
| C. | Kutter’s formula |
| D. | Manning’s formula |
| Answer» C. Kutter’s formula | |
| 43. |
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. | |
| 44. |
The underground sewers are more subjected to________________? |
| A. | Tensile force |
| B. | Compressive force |
| C. | Bending force |
| D. | Shearing force |
| Answer» C. Bending force | |
| 45. |
The temperature affects the________________? |
| A. | Biological activity of bacteria in sewage |
| B. | Solubility of gases in sewage |
| C. | Viscosity of sewage |
| D. | All the above |
| Answer» E. | |
| 46. |
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 | |
| 47. |
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. | |
| 48. |
The standard B.O.D. of water is taken for_________________? |
| A. | 1 day |
| B. | 2 days |
| C. | 3 days |
| D. | 5 days |
| Answer» E. | |
| 49. |
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. | |
| 50. |
The spacing of bars for perforations in coarse screens used for the treatment of sewage, is ____________________? |
| A. | 20 mm |
| B. | 30 mm |
| C. | 40 mm |
| D. | 50 mm |
| Answer» E. | |