MCQOPTIONS
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MCQOPTIONS
This section includes 295 Mcqs, each offering curated multiple-choice questions to sharpen your Public Health Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In high rate activated sludge treatment, bacterias are removed from |
| A. | 20 to 40% |
| B. | 40 to 60% |
| C. | 60 to 80% |
| D. | 80 to 95% |
| Answer» E. | |
| 2. |
When the sewage is to be distributed over a level area surrounded by dykes (i.e. trenches), the mothod of sewage used is called |
| A. | flooding |
| B. | surface irrigation |
| C. | ride and furrow |
| D. | spray irrigation |
| Answer» B. surface irrigation | |
| 3. |
The bacteria which can survive without oxygen is called |
| A. | anaerobic bacteria |
| B. | pathogenic bacteria |
| C. | aerobic bacteria |
| D. | non-pathogenic bacteria |
| Answer» B. pathogenic bacteria | |
| 4. |
Pressure filters are not used for treating municipal water supplies, because |
| A. | the rate of filteration is high |
| B. | the overall plant capacity is small |
| C. | they are inefficient in the removal of turbidity and bacterias |
| D. | they are more costly |
| Answer» E. | |
| 5. |
The sodium carbonate in water |
| A. | causes bad taste |
| B. | softens the water |
| C. | increases hardness of water |
| D. | stops epidemic |
| Answer» C. increases hardness of water | |
| 6. |
The sewage should be disposed off without causing odour and nuisance. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 7. |
The plain ends of cast iron pipes are joined by |
| A. | spigot and socket joint |
| B. | flanged joint |
| C. | victuallic joint |
| D. | dresser coupling joint |
| Answer» E. | |
| 8. |
In order to control the flow of water through pipes, a |
| A. | scour valve |
| B. | air valve |
| C. | gate valve |
| D. | safety valve |
| Answer» D. safety valve | |
| 9. |
The secondary treatment of sewage is carried out by the use of |
| A. | screens |
| B. | grit chambers |
| C. | trickling filters |
| D. | chlorinators |
| Answer» D. chlorinators | |
| 10. |
The permanent hardness in water is caused due to the salts like |
| A. | chlorides |
| B. | nitrates |
| C. | sulphates |
| D. | all of these |
| Answer» E. | |
| 11. |
Bacterias which cause disease are called |
| A. | anaerobic bacteria |
| B. | facultative bacterias |
| C. | aerobic bacteria |
| D. | none of these |
| Answer» E. | |
| 12. |
Pressure filters are best suited for |
| A. | swimming pools |
| B. | railway stations |
| C. | individual industries |
| D. | all of these |
| Answer» E. | |
| 13. |
The process of killing pathogenic bacterias from water is called |
| A. | sedimentation |
| B. | filteration |
| C. | coagulation |
| D. | disinfection |
| Answer» E. | |
| 14. |
The water mains should be designed for |
| A. | 100% |
| B. | 150% |
| C. | 225% |
| D. | 250% |
| Answer» D. 250% | |
| 15. |
A pressure relief valve is provided to prevent |
| A. | the water flowing out of the suction pipe |
| B. | the back flow, when the pump is stopped |
| C. | the increase of pressure after certain safe limit |
| D. | all of the above |
| Answer» D. all of the above | |
| 16. |
According to Indian standards, 45 litres of water per person per day is provided in case of |
| A. | hotels |
| B. | hostels |
| C. | offices |
| D. | all of these |
| Answer» D. all of these | |
| 17. |
For large cities, the suitable method for forecasting population is |
| A. | arithmetical increase method |
| B. | graphical method |
| C. | geometrical increase method |
| D. | comparative method |
| Answer» B. graphical method | |
| 18. |
In orthotolodine test, safe residual for drinking water is indicated by |
| A. | yellow colour |
| B. | green colour |
| C. | lemon yellow colour |
| D. | none of these |
| Answer» B. green colour | |
| 19. |
The average consumption of water for commercial use varies from 20 to 25% of total consumption. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 20. |
The quality of tube well water is |
| A. | good |
| B. | poor |
| Answer» B. poor | |
| 21. |
The water bearing strala i.e. layers of sand, gravel etc, is called |
| A. | an acquifer |
| B. | an aquiclude |
| C. | an aquifuge |
| D. | zone of saturation |
| Answer» B. an aquiclude | |
| 22. |
The water from kitchens, bathrooms, wash basins is called |
| A. | sewage |
| B. | sullage |
| C. | raw sewage |
| D. | none of these |
| Answer» C. raw sewage | |
| 23. |
The alum when mixed with water as a coagulant, |
| A. | does not effect pH value of water |
| B. | decreases pH value of water |
| C. | increases pH value of water |
| D. | none of these |
| Answer» C. increases pH value of water | |
| 24. |
Rapid sand filter can remove bacterias upto an extent of |
| A. | 60% to 70% |
| B. | 70% to 80% |
| C. | 80% to 90% |
| D. | 90% to 99% |
| Answer» D. 90% to 99% | |
| 25. |
Biological action is used in |
| A. | screens |
| B. | sedimentation tanks |
| C. | trickling filters |
| D. | all of these |
| Answer» D. all of these | |
| 26. |
Suspended impurities consist of |
| A. | iron |
| B. | chlorine |
| C. | bacteria |
| D. | all of these |
| Answer» D. all of these | |
| 27. |
Wrought iron pipes are more costly and are |
| A. | less |
| B. | more |
| Answer» B. more | |
| 28. |
The coagulation is not required in |
| A. | slow sand |
| B. | rapid sand |
| Answer» B. rapid sand | |
| 29. |
Water test is conducted for house plumbings. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 30. |
The suitable layout of a distribution system for well planned cities is |
| A. | dead end system |
| B. | ring system |
| C. | radial system |
| D. | grid iron system |
| Answer» C. radial system | |
| 31. |
The water obtained from the tube wells is known as |
| A. | surface water |
| B. | sub-surface water |
| C. | run-off |
| D. | potable water |
| Answer» C. run-off | |
| 32. |
The rate of settling of a particle in water depends upon the |
| A. | viscosity of water |
| B. | density of water |
| C. | specific gravity of particle |
| D. | all of these |
| Answer» E. | |
| 33. |
In lime soda process, the pH value of treated water is increased. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 34. |
In combined system, automatic flushing is not possible. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 35. |
For building drainage pipes, a smoke test is applied. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 36. |
Sludge treatment is mainly done in order to |
| A. | stablize the organic matter |
| B. | destroy the pathogenic bacterias |
| C. | reduce the water content |
| D. | all of these |
| Answer» E. | |
| 37. |
When high level spots are not available for the construction of ground level reservoirs, elevated reservoirs can be used. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 38. |
The volume of a settling basin is large due to |
| A. | large volumes of floc added for coagulation |
| B. | large amount of water entrapped into it |
| C. | greater amount of suspended solids to be removed |
| D. | none of the above |
| Answer» E. | |
| 39. |
The capacity of the pumps is normally expressed as |
| A. | litres per minute |
| B. | cubic metres per day |
| C. | thousands of litres per hour |
| D. | all of these |
| Answer» E. | |
| 40. |
The main object of sewage disposal is |
| A. | to dispose off properly human excreta to a safe place before its creates unhealthy conditions in the locality |
| B. | to dispose off waste water from an area so that it may not become breeding place for mosquitoes |
| C. | to dispose off the sewage after giving it treatment so that the receiving land may not get polluted |
| D. | all of the above |
| Answer» E. | |
| 41. |
In presure filters, water is forced at a pressure |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» D. | |
| 42. |
The treatment which employs mechanical and hydraulic separation principles is referred as secondary treatment. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 43. |
The organic impurities in water form a layer on the top of a filtering media. Such a layer is called |
| A. | permeable layer |
| B. | filtering layer |
| C. | dirty skin |
| D. | none of these |
| Answer» D. none of these | |
| 44. |
The minimum dissolved oxygen required in water to save the aquatic life is |
| A. | 1 ppm |
| B. | 2 ppm |
| C. | 4 ppm |
| D. | 8 ppm |
| Answer» D. 8 ppm | |
| 45. |
The quantity of water available from an infiltration gallery depends upon the |
| A. | size of gallery |
| B. | nature of soil |
| C. | yield of source |
| D. | all of these |
| Answer» E. | |
| 46. |
No deposition will take place in |
| A. | larger |
| B. | smaller |
| Answer» C. | |
| 47. |
When the pH value of water is more than 7, it represents |
| A. | neutal |
| B. | acidic |
| C. | alkaline |
| Answer» D. | |
| 48. |
The amount of oxygen consumed by sewage from an oxidising agent like potassium dichromate is termd as |
| A. | bio-chemical oxygen demand (B.O.D.) |
| B. | chemical oxygen demand (C.O.D.) |
| C. | relative stability |
| D. | none of these |
| Answer» C. relative stability | |
| 49. |
The hydrants are used for tapping waer from mains for |
| A. | fire extinguishing |
| B. | street washing |
| C. | flushing sewer lines |
| D. | all of these |
| Answer» E. | |
| 50. |
The acration of water is done to remove |
| A. | colour |
| B. | odour |
| C. | taste |
| D. | all of these |
| Answer» E. | |