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. |
Grit should be removed from sewage before |
| A. | their disposal in dilution water |
| B. | their lifting by means of pump etc. |
| C. | settling of sewage in sedimentation tank |
| D. | all of the above |
| Answer» E. | |
| 2. |
The ideal method of disinfection of swimming pool water is by |
| A. | chlorination |
| B. | lime treatment |
| C. | ozonisation |
| D. | ultra-violet rays |
| Answer» D. ultra-violet rays | |
| 3. |
The prsence of sodium chloride in water |
| A. | causes bad taste |
| B. | softens the water |
| C. | increases hardness of water |
| D. | stops epidemic |
| Answer» C. increases hardness of water | |
| 4. |
The water carriage sewage system removes |
| A. | domestic sewage |
| B. | industrial sewage |
| C. | storm sewage |
| D. | all of these |
| Answer» E. | |
| 5. |
A scour valve, in a water distribution system, is provided at |
| A. | low points |
| B. | high points |
| C. | junction points |
| D. | all of these |
| Answer» B. high points | |
| 6. |
The open wells or dug wells are also known as |
| A. | shallow wells |
| B. | draw wells |
| C. | percolation wells |
| D. | all of these |
| Answer» E. | |
| 7. |
The maximum permissible quantity of lead in water for domestic supplies is |
| A. | 0.01 ppm |
| B. | 0.05 ppm |
| C. | 0.50 ppm |
| D. | 1 ppm |
| Answer» C. 0.50 ppm | |
| 8. |
In dry feeding type of coagulants, the dose of coagulant is controlled by |
| A. | scrapers |
| B. | worm wheel |
| C. | paddles |
| D. | none of these |
| Answer» C. paddles | |
| 9. |
The percentage ratio of the oxygen available in sewage to the oxygen required to satisfy one stage of bio-chemical oxygen demand (B.O.D.) is termed as |
| A. | chemical oxygen demand |
| B. | oxygen consumed |
| C. | relative stability |
| D. | bio-oxygen demand |
| Answer» D. bio-oxygen demand | |
| 10. |
The continuous flow of water may be expected from |
| A. | surface springs |
| B. | artesian springs |
| C. | gravity springs |
| D. | all of these |
| Answer» C. gravity springs | |
| 11. |
The anti-siphonage pipe is not required in |
| A. | one pipe system |
| B. | two pipe system |
| C. | single stack system |
| D. | none of these |
| Answer» D. none of these | |
| 12. |
The earth's water circulatory system is known as. |
| A. | water cycle |
| B. | hydrological cycle |
| C. | precipitation cycle |
| D. | all of these |
| Answer» C. precipitation cycle | |
| 13. |
Colloidal impurities if associated with organic matter having bacterias becomes the chief source of |
| A. | hardness |
| B. | epidemic |
| C. | alkalinity |
| D. | bad taste |
| Answer» C. alkalinity | |
| 14. |
Rpid sand filters are suitable for small towns and villages. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 15. |
The quantity of storm water (Q) in liter per second is given by Q = CA3/4. This formula is called |
| A. | Fanning's formula |
| B. | Ryve's formula |
| C. | Dicken's formula |
| D. | Inglis formula |
| Answer» D. Inglis formula | |
| 16. |
The particle will settle down more rapidly in water at high temperatures than at lower temperatures. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 17. |
Zeolite process is also known as |
| A. | base exchange process |
| B. | Cation exchange process |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 18. |
The process of purifying water by passing it through a bed of fine granular material, is called |
| A. | screening |
| B. | filteration |
| C. | coagulation |
| D. | sedimentation |
| Answer» C. coagulation | |
| 19. |
The commercial osmoscope is graduated with pO values from |
| A. | 0 to 5 |
| B. | 5 to 10 |
| C. | 10 to 15 |
| D. | 15 to 20 |
| Answer» B. 5 to 10 | |
| 20. |
The method in which different types of refuse are collected, carried and disposed off separately is called |
| A. | conservancy method |
| B. | dry method |
| C. | water carriage method |
| D. | either (a) and (b) |
| Answer» E. | |
| 21. |
For a well planned city, we whall use the grid iron system for the distribution of pipes. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 22. |
In one pipe system of plumbing, |
| A. | only one pipe is provided |
| B. | the main pipe is connected directly to the drainage system |
| C. | all of the traps are fully ventilated and connected to the ventilation pipe |
| D. | all of the above |
| Answer» E. | |
| 23. |
The privy pit should be located at least |
| A. | 3 m |
| B. | 10 m |
| C. | 30 m |
| D. | 50 m |
| Answer» B. 10 m | |
| 24. |
Suspended impurities include |
| A. | algae |
| B. | protozoa |
| C. | fungi |
| D. | all of these |
| Answer» E. | |
| 25. |
A good trap should |
| A. | not have self cleaning property |
| B. | restrict the flow of water |
| C. | provide an adequate water seal at all times |
| D. | all of these |
| Answer» D. all of these | |
| 26. |
Membrane filter technique is used for testing |
| A. | E-coli |
| B. | copper |
| C. | pathogenic bacterias |
| D. | none of these |
| Answer» B. copper | |
| 27. |
Cess pool is not recommended by the health authorities. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 28. |
The sanitation system in which a small portion of storm water is allowed to enter in the sanitary sewage sewers and the remaining storm water flows in separate set of sewers, is known as |
| A. | separate system |
| B. | combined system |
| C. | partially separate system |
| D. | partially combined system |
| Answer» D. partially combined system | |
| 29. |
The colour of water is expressed in numbers of a |
| A. | silica scale |
| B. | platinum cobalt scale |
| C. | pO value |
| D. | none of these |
| Answer» C. pO value | |
| 30. |
For high and fluctuating heads |
| A. | reciprocating |
| B. | centrifugal |
| Answer» B. centrifugal | |
| 31. |
Low turbidity of water can be determined by |
| A. | turbidity tube |
| B. | Jacksons turbidimeter |
| C. | Baylis turbidimeter |
| D. | Hellipe turbidimeter |
| Answer» D. Hellipe turbidimeter | |
| 32. |
The amount of oxygen required for the biological decomposition of dissovled organic solids to occur under aerobic conditions is called bio-chemical oxygen demand (B.O.D.) |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 33. |
In a rapid sand filter |
| A. | raw water from the source is supplied |
| B. | disinfected raw water is supplied |
| C. | raw water passed through coagulation tank is supplied |
| D. | any one of the above |
| Answer» D. any one of the above | |
| 34. |
In order to prevent water to flow back in opposite direction, we shall use a |
| A. | scour valve |
| B. | air valve |
| C. | gate valve |
| D. | reflux valve |
| Answer» E. | |
| 35. |
Which of the following is not a coagulating agent? |
| A. | Ferric sulphate |
| B. | Ferric chloride |
| C. | Aluminium sulphate |
| D. | Copper sulphate |
| Answer» E. | |
| 36. |
A reflux valve is also known as |
| A. | safety valve |
| B. | scour valve |
| C. | air valve |
| D. | check valve |
| Answer» E. | |
| 37. |
A sewer which receives sewage from the collection system and conducts it to a point of final disposal is called a |
| A. | common sewer |
| B. | trunk sewer |
| C. | branch sewer |
| D. | outfall sewer |
| Answer» E. | |
| 38. |
In India, as per Indian standards, water consumption per capita per day for domestic purpose is |
| A. | 85 litres |
| B. | 100 litres |
| C. | 115 litres |
| D. | 135 litres |
| Answer» E. | |
| 39. |
The storm sewers are essentially required to |
| A. | avoid creation of unfavourable healthy conditions |
| B. | improve the general appearance of the city |
| C. | dispose off the first washings of early showers as quickly as possible |
| D. | all of the above |
| Answer» E. | |
| 40. |
The domestic use of water amounts to |
| A. | 20% |
| B. | 30% |
| C. | 40% |
| D. | 50% |
| Answer» E. | |
| 41. |
The bacterias which do not cause any disease are called pathogenic bacterias. |
| A. | Right |
| B. | Wrong |
| Answer» C. | |
| 42. |
The under drainage system in slow sand filters |
| A. | receives and collects the filtered water |
| B. | allows back washing for cleaning the filter |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» B. allows back washing for cleaning the filter | |
| 43. |
The maximum permissible temperature for domestic supply is |
| A. | 5 to 10?C |
| B. | 10 to 15?C |
| C. | 15 to 20?C |
| D. | 20 to 25?C |
| Answer» C. 15 to 20?C | |
| 44. |
Bacteria which can survive with or without free oxygen is known as facultative bacteria. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 45. |
The minimum size of a fire hydrant is |
| A. | 5 cm |
| B. | 10 cm |
| C. | 15 cm |
| D. | 20 cm |
| Answer» D. 20 cm | |
| 46. |
If the level of source of water is higher than that of the place of consumption, the system adopted for supplying water is |
| A. | pumping system |
| B. | gravitational system |
| C. | combined pumping and gravity system |
| D. | any one of these |
| Answer» C. combined pumping and gravity system | |
| 47. |
The bio-chemical treatment of sewage effluent is a process of |
| A. | oxidation |
| B. | deoxidation |
| C. | self purification |
| D. | sedimentation |
| Answer» B. deoxidation | |
| 48. |
A combined system will be favourable when |
| A. | the sewers are to be laid in rocks |
| B. | the finances are limited |
| C. | the topography is flat necessitating deep excavation for combined sewers |
| D. | the locality to be served has narrow streets |
| Answer» E. | |
| 49. |
The pH value of water for public supplies is limited from |
| A. | 2.5 to 6.5 |
| B. | 6.5 to 8 |
| C. | 8 to 10.5 |
| D. | 10.5 to 15 |
| Answer» C. 8 to 10.5 | |
| 50. |
The water of a river has an important property called |
| A. | turbidity |
| B. | self purification |
| C. | permeability |
| D. | infiltration capacity |
| Answer» C. permeability | |