MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The spacing of bars of perforations of fine screens used for the treatment of sewage, is_______________? |
| A. | 2 to 3 mm |
| B. | 3 to 5 mm |
| C. | 5 to 8 mm |
| D. | 8 to 10 mm |
| Answer» B. 3 to 5 mm | |
| 2. |
The small sewers are cleaned by____________________? |
| A. | Flushing |
| B. | Cane rodding |
| C. | Wooden pills |
| D. | None of these |
| Answer» B. Cane rodding | |
| 3. |
The sludge does not contain waste water from_________________? |
| A. | Bath rooms |
| B. | Wash basins |
| C. | Kitchen sinks |
| D. | Toilets |
| Answer» E. | |
| 4. |
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. | |
| 5. |
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. | |
| 6. |
The sewerage system originates from__________________? |
| A. | House sewers |
| B. | Lateral sewers |
| C. | Branch sewers |
| D. | Main sewers |
| Answer» B. Lateral sewers | |
| 7. |
The sewer which transports the sewage to the point of treatment, is called________________? |
| A. | House sewer |
| B. | Out-fall sewer |
| C. | Branch sewer |
| D. | Main sewer |
| Answer» C. Branch sewer | |
| 8. |
The sewerage system consists of______________________? |
| A. | House sewer |
| B. | Lateral sewer |
| C. | Branch sewer |
| D. | All of these |
| Answer» E. | |
| 9. |
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 | |
| 10. |
The sewer which resists sulphide corrosion, is____________________? |
| A. | Brick sewer |
| B. | Cast iron sewer |
| C. | R.C.C. sewer |
| D. | Lead sewer |
| Answer» E. | |
| 11. |
The sewer that unloads the sewage at the point of treatment is called_________________? |
| A. | Main sewer |
| B. | Outfall sewer |
| C. | Branch sewer |
| D. | House sewer |
| Answer» C. Branch sewer | |
| 12. |
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. | |
| 13. |
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 | |
| 14. |
The sewer pipe which carries sewage from a building for immediate disposal is______________? |
| A. | House sewer |
| B. | Lateral sewer |
| C. | Intercepting sewer |
| D. | Main sewer |
| Answer» B. Lateral sewer | |
| 15. |
The sewage treatment in septic tanks is due to__________________? |
| A. | Anaerobic decomposition |
| B. | Aerobic decomposition |
| C. | Parasitic decomposition |
| D. | None of these |
| Answer» B. Aerobic decomposition | |
| 16. |
The sewage is pumped up_______________? |
| A. | From low lying areas |
| B. | From flat areas |
| C. | From basements |
| D. | All the above |
| Answer» E. | |
| 17. |
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 | |
| 18. |
The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is____________________? |
| A. | 30 minutes |
| B. | 1 hour |
| C. | 1 hour and 30 minutes |
| D. | 2 hours |
| Answer» E. | |
| 19. |
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 – Gw)d² [(3T + 70)/100] | |
| 20. |
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 | |
| 21. |
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. | All the above |
| Answer» E. | |
| 22. |
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 | |
| 23. |
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 | |
| 24. |
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 | |
| 25. |
The recommended detention period for grit chambers is_______________? |
| A. | 1 minute |
| B. | 2 minutes |
| C. | 3 minutes |
| D. | 5 minutes |
| Answer» B. 2 minutes | |
| 26. |
The rational formula for peak drainage discharge, was evolved by_________________? |
| A. | Fruhling |
| B. | Lloyd David |
| C. | Kuichling |
| D. | All of these |
| Answer» E. | |
| 27. |
The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is____________________? |
| A. | 1.095 |
| B. | 1.085 |
| C. | 1.075 |
| D. | 1.065 |
| Answer» B. 1.085 | |
| 28. |
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 | |
| 29. |
The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is____________________? |
| A. | 1.5 |
| B. | 2.0 |
| C. | 3.0 |
| D. | 4.0 |
| Answer» B. 2.0 | |
| 30. |
The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is___________________? |
| A. | 1.5 |
| B. | 2.0 |
| C. | 3.0 |
| D. | 4.0 |
| Answer» C. 3.0 | |
| 31. |
The ratio of design discharge to the surface area of a sedimentation tank is called____________________? |
| A. | Surface loading |
| B. | Overflow rate |
| C. | Overflow velocity |
| D. | All of these |
| Answer» E. | |
| 32. |
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 | |
| 33. |
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 | |
| 34. |
The rainfall at any place may be determined by__________________? |
| A. | Its intensity |
| B. | Its direction |
| C. | Its frequency |
| D. | All the above |
| Answer» E. | |
| 35. |
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 | |
| 36. |
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. | |
| 37. |
The presence of free ammonia in sewage, is detected by___________________? |
| A. | Boiling |
| B. | Adding potassium permanganate |
| C. | Adding sulphuric acid |
| D. | Phenol-di-sulphuric acid |
| Answer» B. Adding potassium permanganate | |
| 38. |
The porosity of sediments in sewer pipes, is usually taken as___________________? |
| A. | 0.010 |
| B. | 0.011 |
| C. | 0.012 |
| D. | 0.013 |
| Answer» E. | |
| 39. |
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 | |
| 40. |
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 | |
| 41. |
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 | |
| 42. |
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 | |
| 43. |
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 | |
| 44. |
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 | |
| 45. |
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 | |
| 46. |
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 | |
| 47. |
The most efficient cross-section of sewers in a combined sewerage system is________________? |
| A. | Parabolic |
| B. | Circular |
| C. | Rectangular |
| D. | New egged |
| Answer» C. Rectangular | |
| 48. |
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 | |
| 49. |
The most dangerous pollutant in vehicular emissions is____________________? |
| A. | CO |
| B. | SO2 |
| C. | CO2 |
| D. | O3 |
| Answer» B. SO2 | |
| 50. |
The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is_______________? |
| A. | 25 % |
| B. | 50 % |
| C. | 10 % |
| D. | 5 % |
| Answer» C. 10 % | |