MCQOPTIONS
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MCQOPTIONS
This section includes 260 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. |
The ratio of minimum hourly flow to the average flow of sewage is%! |
| A. | 1/4 |
| B. | 1/3 |
| C. | 1/2 |
| D. | 3/4 |
| Answer» C. 1/2 | |
| 2. |
The minimum diameter of a sewer is kept%! |
| A. | 10 cm |
| B. | 15 cm |
| C. | 20 cm |
| D. | 25 cm |
| Answer» C. 20 cm | |
| 3. |
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 | |
| 4. |
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 | |
| 5. |
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 | |
| 6. |
A manhole is generally provided at each%! |
| A. | Bend |
| B. | Junction |
| C. | Change of gradient |
| D. | All the above |
| Answer» E. | |
| 7. |
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 |
| Answer» E. | |
| 8. |
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. | |
| 9. |
In a trickling filter%! |
| A. | Filtration process is used |
| B. | Biological action is used |
| C. | Neither A nor B |
| D. | Both A and B |
| Answer» C. Neither A nor B | |
| 10. |
The pH value of sewage is determined with the help of%! |
| A. | Imhoff Cone |
| B. | Turbid meter |
| C. | Potentiometer |
| D. | None of these |
| Answer» D. None of these | |
| 11. |
A manhole is classified as shallow if its depth is between%! |
| A. | 0.4 to 0.5 m |
| B. | 0.5 to 0.7 m |
| C. | 0.7 to 0.9 m |
| D. | 0.9 to 1.20 m |
| Answer» D. 0.9 to 1.20 m | |
| 12. |
The recommended detention period for grit chambers is%! |
| A. | 1 minute |
| B. | 2 minutes |
| C. | 3 minutes |
| D. | 5 minutes |
| Answer» B. 2 minutes | |
| 13. |
Flocculated particles do not change their%! |
| A. | Size |
| B. | Shape |
| C. | Weight |
| D. | None of these |
| Answer» E. | |
| 14. |
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. | |
| 15. |
*$_Ventilating shafts are provided to a sewer line at every? |
| A. | 100 m |
| B. | 150 m |
| C. | 200 m |
| D. | 300 m |
| Answer» E. | |
| 16. |
*$_The average temperature of sewage in India, is? |
| A. | 10°C |
| B. | 15°C |
| C. | 20°C |
| D. | 25°C |
| Answer» D. 25¬¨‚àûC | |
| 17. |
*$_The sewerage system consists of? |
| A. | House sewer |
| B. | Lateral sewer |
| C. | Branch sewer |
| D. | All of these |
| Answer» E. | |
| 18. |
*$_The sewer which received discharge from two or more main sewers, is known as? |
| A. | A trunk sewer |
| B. | An outfall sewer |
| C. | A main sewer |
| D. | An intercepting sewer |
| Answer» B. An outfall sewer | |
| 19. |
*$_The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known? |
| A. | House sewer |
| B. | Lateral sewer |
| C. | Branch sewer |
| D. | Sewer outfall |
| Answer» E. | |
| 20. |
*$_If the diameter of sewer is 225 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» D. None of these | |
| 21. |
*$_The normal value of over flow rates for plain primary sedimentation tanks, ranges between? |
| A. | 25,000 to 35,000 litres/sqm/day |
| B. | 40,000 to 50,000 litres/sqm/day |
| C. | 50,000 to 60,000 litres/sqm/day |
| D. | 80,000 to 100,000 litres/sqm/day |
| Answer» C. 50,000 to 60,000 litres/sqm/day | |
| 22. |
*$_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 % | |
| 23. |
*$_The small sewers are cleaned by? |
| A. | Flushing |
| B. | Cane rodding |
| C. | Wooden pills |
| D. | None of these |
| Answer» B. Cane rodding | |
| 24. |
*$_The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is? |
| A. | Vs = 418 (Gs – Gw) d [(3T + 70)/100] |
| B. | Vs = 418 (Gs – Gw)d² [(3T + 70)/100] |
| C. | Vs = 218 (Gs – Gw)d² [(3T + 70)/100] |
| D. | Vs = 218 (Gs – Gw)d [(3T + 70)/100] |
| Answer» C. Vs = 218 (Gs ‚Äö√Ñ√¨ Gw)d¬¨‚⧠[(3T + 70)/100] | |
| 25. |
*$_The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is? |
| A. | 0.05552 cumec |
| B. | 0.05554 cumec |
| C. | 0.05556 cumec |
| D. | 0.0556 cumec |
| Answer» D. 0.0556 cumec | |
| 26. |
*$_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 | |
| 27. |
*$_During preliminary treatment of a sewage? |
| A. | Oil and grease are removed from skimming tanks |
| B. | Floating materials are removed by screening |
| C. | Girt and sand are removed by girt chambers |
| D. | All the above |
| Answer» E. | |
| 28. |
*$_The minimum recommended diameter of sewers, is? |
| A. | 5 cm |
| B. | 10 cm |
| C. | 15 cm |
| D. | 20 cm |
| Answer» D. 20 cm | |
| 29. |
*$_depends upon The Chezy’s constant C in the formula V = C? |
| A. | Size of the sewer |
| B. | Shape of the sewer |
| C. | Roughness of sewer surface |
| D. | All the above |
| Answer» E. | |
| 30. |
*$_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 | |
| 31. |
*$_For sewers, inverted siphon is provided for? |
| A. | One pipe |
| B. | Two pipes |
| C. | Three pipes |
| D. | Four pipes |
| Answer» D. Four pipes | |
| 32. |
*$_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 Bruges |
| C. | William-Hazen |
| D. | Kutter |
| Answer» C. William-Hazen | |
| 33. |
*$_The non-clog pump which permits solid matter to pass out with the liquid sewage, is? |
| A. | Centrifugal pump |
| B. | Reciprocating pump |
| C. | Pneumatic ejector |
| D. | None of these |
| Answer» B. Reciprocating pump | |
| 34. |
*$_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 | |
| 35. |
*$_The rate of accumulation of sludge in septic tanks is recommended as? |
| A. | 30 litres/person/year |
| B. | 25 litres/person/year |
| C. | 30 litres/person/month |
| D. | 25 litres/person/month |
| Answer» B. 25 litres/person/year | |
| 36. |
*$_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 | |
| 37. |
*$_Which one of the following part of human body withstands minimum radiation?? |
| A. | Thyroid |
| B. | Kidneys |
| C. | Eyes |
| D. | Ovaries/testis |
| Answer» E. | |
| 38. |
*$_Chlorination of water is done for the removal of? |
| A. | Bacterias |
| B. | Suspended solids |
| C. | Sediments |
| D. | Hardness |
| Answer» B. Suspended solids | |
| 39. |
*$_The most effective arrangement for diverting excess storm water into a natural drainage, is? |
| A. | Leaping weir |
| B. | Overflow weir |
| C. | Siphon spill way |
| D. | None of these |
| Answer» D. None of these | |
| 40. |
*$_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. | |
| 41. |
*$_The sewer which resists sulphide corrosion, is? |
| A. | Brick sewer |
| B. | Cast iron sewer |
| C. | R.C. sewer |
| D. | Lead sewer |
| Answer» E. | |
| 42. |
*$_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 |
| Answer» E. | |
| 43. |
*/*_The ratio of minimum hourly flow to the average flow of sewage is? |
| A. | 1/4 |
| B. | 1/3 |
| C. | 1/2 |
| D. | 3/4 |
| Answer» C. 1/2 | |
| 44. |
*/*_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 | |
| 45. |
*/*_The minimum diameter of a sewer is kept? |
| A. | 10 cm |
| B. | 15 cm |
| C. | 20 cm |
| D. | 25 cm |
| Answer» C. 20 cm | |
| 46. |
*/*_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 | |
| 47. |
*/*_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 | |
| 48. |
*/*_Inter-distance between ventilation columns in a sewer line is kept? |
| A. | 25 to 50 m |
| B. | 50 m to 100 m |
| C. | 100 m to 150 m |
| D. | 150 m to 300 m |
| Answer» E. | |
| 49. |
*/*_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 | |
| 50. |
*/*_For trunk and out-fall, the type of sewers generally used, is? |
| A. | Standard egg shaped |
| B. | Circular shaped |
| C. | Horse shoe shaped |
| D. | Parabolic shaped |
| Answer» D. Parabolic shaped | |