McqMate
| 1. |
The presence of |
| A. | iron |
| B. | manganese |
| C. | sodium fluoride |
| D. | calcium carbonate |
| Answer» A. iron | |
| 2. |
The maximum permissible chlorine content for public supplies should be between |
| A. | 0.1 to 0.2 ppm |
| B. | 0.3 to 0.4 ppm |
| C. | 1.2 to 4 ppm |
| D. | 6.5 to 8 ppm |
| Answer» A. 0.1 to 0.2 ppm | |
| 3. |
Air vent pipe is not essentially required in a septic tank. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
The pocess of excluding large sized particles from water with the help of screens is called filteration. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 5. |
A pipe installed for ventilation purpose is called |
| A. | waste pipe |
| B. | soil pipe |
| C. | vent pipe |
| D. | anti-siphonage pipe |
| Answer» C. vent pipe | |
| 6. |
The presence of calcium and magnesium chloride in water causes |
| A. | softening |
| B. | bad taste |
| C. | hardness |
| D. | turbidity |
| Answer» C. hardness | |
| 7. |
In the process of screening, the screens should be inclined at an angle of |
| A. | 10? to 20? |
| B. | 30? to 40? |
| C. | 45? to 60? |
| D. | 70? to 85? |
| Answer» C. 45? to 60? | |
| 8. |
To prevent the formation of crystalline hydrates of 'Ice' of chlorine, the chlorine supply cylinders are kept at a temperature from |
| A. | 10?C to 20?C |
| B. | 20?C to 27?C |
| C. | 27?C to 37?C |
| D. | 38?C to 42?C |
| Answer» D. 38?C to 42?C | |
| 9. |
When chlorine is added to raw water at more than one point, the process is termed as break point chlorination. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 10. |
Manholes on sewer lines are provided for |
| A. | periodic cleaning |
| B. | providing air for oxidation |
| C. | removal of part of sewerage |
| D. | all of these |
| Answer» A. periodic cleaning | |
| 11. |
The length of rectangular sedimentation tank should not be more than |
| A. | twice |
| B. | three times |
| C. | four times |
| D. | six times |
| Answer» C. four times | |
| 12. |
The most commonly used chemical for dechlorination of water is |
| A. | sodium thiosulphate |
| B. | sodium sulphite |
| C. | potassium permaganate |
| D. | all of these |
| Answer» D. all of these | |
| 13. |
The discharge from washing places is called sullage. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 14. |
The portion of soil through which lateral movement of water takes place is called |
| A. | water tablean aquiclude |
| B. | an aquiclude |
| C. | zone of saturation |
| D. | none of these |
| Answer» C. zone of saturation | |
| 15. |
A septic tank is a |
| A. | sedimentation tank |
| B. | digestion tank |
| C. | combination of sedimentation and digestion tank |
| D. | aeration tank |
| Answer» C. combination of sedimentation and digestion tank | |
| 16. |
Under steady low heads |
| A. | reciprocating |
| B. | centrifugal |
| Answer» B. centrifugal | |
| 17. |
The maximum permissible total solid content in water for domestic purposes should not exceed |
| A. | 300 ppm |
| B. | 400 ppm |
| C. | 500 ppm |
| D. | 1000 ppm |
| Answer» C. 500 ppm | |
| 18. |
Cleaning of rapid sand filters is done by |
| A. | scraping the top layer of filter media |
| B. | back washing |
| C. | providing new sand layers |
| D. | all of these |
| Answer» B. back washing | |
| 19. |
The sand, used for filteration, should not loose weight more than |
| A. | 2.50% |
| B. | 5% |
| C. | 7.50% |
| D. | 10% |
| Answer» B. 5% | |
| 20. |
Bleaching powder is |
| A. | slaked lime |
| B. | chloride of lime |
| C. | hypo-chloride of lime |
| D. | hypo-chlorite of lime |
| Answer» D. hypo-chlorite of lime | |
| 21. |
The efficiency of sedimentation tank for a given discharge, can be increased by |
| A. | increasing the depth of tank |
| B. | decreasing the depth of tank |
| C. | increasing the surface area of tank |
| D. | decreasing the surface area of tank |
| Answer» C. increasing the surface area of tank | |
| 22. |
Absolute pure water is good for health. |
| A. | Right |
| B. | Wrong |
| Answer» B. Wrong | |
| 23. |
The most important source of water for public water supply is |
| A. | lake |
| B. | pond |
| C. | river |
| D. | sea |
| Answer» D. sea | |
| 24. |
The most common cause of acidity in water is |
| A. | hydrogen |
| B. | oxygen |
| C. | carbon dioxide |
| D. | all of these |
| Answer» C. carbon dioxide | |
| 25. |
Water is |
| A. | safe |
| B. | harmful |
| Answer» B. harmful | |
| 26. |
The temporary hardness due to calcium bicarbonates can be removed by |
| A. | boiling |
| B. | lime process |
| C. | lime-soda process |
| D. | zeolite process |
| Answer» A. boiling | |
| 27. |
Which of the following statement is correct? |
| A. | The pumping system is the best system of water distribution. |
| B. | A sluice valve prevents water to flow back in the opposite direction |
| C. | In a ring system, there is one main supply pipe. |
| D. | all of the above |
| Answer» C. In a ring system, there is one main supply pipe. | |
| 28. |
The minimum diameter of a manhole cover should be |
| A. | 25 m |
| B. | 50 cm |
| C. | 75 cm |
| D. | 100 cm |
| Answer» B. 50 cm | |
| 29. |
An egg-shaped cross-section of a sewer |
| A. | is economical than circular cross-section |
| B. | is more stable than circular cross-section |
| C. | provides self cleaning velocity in dry weather |
| D. | none of the above |
| Answer» C. provides self cleaning velocity in dry weather | |
| 30. |
Garbage is a |
| A. | dry waste |
| B. | semi-liquid waste |
| C. | liquid waste |
| D. | none of these |
| Answer» A. dry waste | |
| 31. |
The human excreta is a |
| A. | dry |
| B. | semi-liquid |
| C. | liquid |
| Answer» B. semi-liquid | |
| 32. |
The increase in population of a young and rapidly developing city is estimated by comparative method. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 33. |
The lime soda process of water softening |
| A. | requires less quantity of coagulant |
| B. | helps in kolling pathogenic bacterias |
| C. | is suitable for turbid and acidic water |
| D. | all of these |
| Answer» D. all of these | |
| 34. |
Odours and tastes may result due to the prsence of |
| A. | micro-organisms either dead or alive |
| B. | dissolved gases such as oxygen, carbon dioxide, methane etc. |
| C. | mineral substances such as sodium chloride, iron compounds etc. |
| D. | all of the above |
| Answer» D. all of the above | |
| 35. |
The lower portion of a manhole is is known as |
| A. | access shaft |
| B. | base |
| C. | working chamber |
| D. | cover |
| Answer» C. working chamber | |
| 36. |
Which of the following statement is wrong? |
| A. | The water carriage system is more hygienic. |
| B. | There is no smell or sight nuisance in the case of water carriage system. |
| C. | The sewers in the water carriage system being all underground do not impair the beauty of the place |
| D. | The initial cost of construction of water carriage system is very low. |
| Answer» D. The initial cost of construction of water carriage system is very low. | |
| 37. |
Land disposal of sewage will be favourable where |
| A. | the rivers run dry or have a small flow during summer |
| B. | rainfall is very high |
| C. | climate is wet and rates of evaporation is low |
| D. | all of the above |
| Answer» A. the rivers run dry or have a small flow during summer | |
| 38. |
The amount of residual chlorine in treated water is determined by the |
| A. | Orthotolodine test |
| B. | Iodemetric test |
| C. | Amperometric test |
| D. | all of these |
| Answer» D. all of these | |
| 39. |
When in the pervious strata, the surface of water surrounding the well is at atmospheric pressure, the well is known as |
| A. | gravity well |
| B. | artesian well |
| C. | open well |
| D. | deep well |
| Answer» A. gravity well | |
| 40. |
The natural outflow of sub-surface water at the surface is termed as spring. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 41. |
When turbidity of water exceeds about 45 ppm, coagulation |
| A. | should be |
| B. | should not be |
| Answer» A. should be | |
| 42. |
Manholes are, generally, located |
| A. | at all changes of direction |
| B. | at all changes of gradient |
| C. | at all junctions of main and branch sewers |
| D. | all of these |
| Answer» D. all of these | |
| 43. |
The bacteria which require oxygen for their survival is known as |
| A. | anaerobic bacteria |
| B. | pathogenic bacteria |
| C. | aerobic bacteria |
| D. | non-pathogenic bacteria |
| Answer» C. aerobic bacteria | |
| 44. |
The turbidity in water is caused due to |
| A. | silt |
| B. | clay |
| C. | finely divided organic matter |
| D. | all of these |
| Answer» D. all of these | |
| 45. |
The process of removing excess chlorine from water is called |
| A. | plain chlorination |
| B. | post-chlorination |
| C. | dechlorination |
| D. | super-chlorination |
| Answer» C. dechlorination | |
| 46. |
The coefficient of uniformity for slow sand filters is |
| A. | 1.35 |
| B. | 1.55 |
| C. | 1.75 |
| D. | 2.05 |
| Answer» C. 1.75 | |
| 47. |
In a rapid sand filter, the filter head varies from |
| A. | 1 to 1.5 m |
| B. | 1.5 to 2 m |
| C. | 2 to 4 m |
| D. | 4 to 5 m |
| Answer» C. 2 to 4 m | |
| 48. |
For a city or town with roads of rectangular pattern, the type of layout used for the distribution of pipes is |
| A. | dead end system |
| B. | ring system |
| C. | radial system |
| D. | grid iron system |
| Answer» D. grid iron system | |
| 49. |
The type of joint to be used in pipes depends upon the |
| A. | material of pipe |
| B. | internal pressure |
| C. | conditions of support |
| D. | all of these |
| Answer» D. all of these | |
| 50. |
Grit chambers are used to remove sand and other organic matter from sewage. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 51. |
The water supply system means |
| A. | the entire scheme of collection and disposal of liquid waste |
| B. | the complete layout from the source of supply to the distribution |
| C. | construction of reservoirs |
| D. | construction of canals |
| Answer» B. the complete layout from the source of supply to the distribution | |
| 52. |
The process of dechlorination is followed by |
| A. | pre-chlorination |
| B. | post cholorination |
| C. | super chlorination |
| D. | double chlorination |
| Answer» C. super chlorination | |
| 53. |
Suspended impurities cause turbidity in water. |
| A. | Yes |
| B. | No |
| Answer» A. Yes | |
| 54. |
The horizontal tunnels constructed at shallow depths along the banks of a river to intercept the ground water table are called |
| A. | canals |
| B. | infiltration galleries |
| C. | springs |
| D. | lakes |
| Answer» B. infiltration galleries | |
| 55. |
Air binding means accumulation of |
| A. | air |
| B. | impurities |
| Answer» A. air | |
| 56. |
The yield of a rapid sand filter is |
| A. | 10 times |
| B. | 15 times |
| C. | 20 times |
| D. | 30 times |
| Answer» D. 30 times | |
| 57. |
Calcium sulphate present in water causes corrosion. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 58. |
The water which leaks into sewers from the ground is termed as infiltration. |
| A. | Yes |
| B. | No |
| Answer» A. Yes | |
| 59. |
When the pO value of water is 5, then it has |
| A. | no perceptible odour |
| B. | distinct odour |
| C. | faint odour |
| D. | extremely strong odour |
| Answer» D. extremely strong odour | |
| 60. |
Pre-chlorination |
| A. | improves coagulation |
| B. | reduces odours |
| C. | reduces tastes |
| D. | all of these |
| Answer» D. all of these | |
| 61. |
The activated sludge process of sewage treatment |
| A. | requires smaller area for construction of whole unit |
| B. | requires smaller water head for operation than trickling filters |
| C. | has high efficiency |
| D. | all of the above |
| Answer» D. all of the above | |
| 62. |
Turbidity of water is expressed in terms of |
| A. | silica scale |
| B. | platinum cobalt scale |
| C. | pO value |
| D. | none of these |
| Answer» A. silica scale | |
| 63. |
The temporary hardness in water is cused due to the salts like |
| A. | chlorides |
| B. | nitrates |
| C. | carbonates |
| D. | sulphates |
| Answer» C. carbonates | |
| 64. |
A valve which allows the water to flow in one direction but prevents its flow in the reverse direction, is known as |
| A. | sluice valve |
| B. | reflux valve |
| C. | air relief valve |
| D. | pressure relief valve |
| Answer» B. reflux valve | |
| 65. |
The rate of filteration |
| A. | increases |
| B. | decreases |
| Answer» B. decreases | |
| 66. |
The pipe joint commonly used in pumping stations is |
| A. | flexible joint |
| B. | flanged joint |
| C. | expansion joint |
| D. | spigot and socket joint |
| Answer» B. flanged joint | |
| 67. |
The maximum permissible chloride content in water for domestic supplies should not exceed |
| A. | 250 ppm |
| B. | 350 ppm |
| C. | 450 ppm |
| D. | 550 ppm |
| Answer» A. 250 ppm | |
| 68. |
For high and fluctuating heads |
| A. | reciprocating |
| B. | centrifugal |
| Answer» A. reciprocating | |
| 69. |
The vertical wells provided along the banks of a river to draaw ground water in dry season are called |
| A. | Open wells |
| B. | tube wells |
| C. | artesian wells |
| D. | infiltration wells |
| Answer» D. infiltration wells | |
| 70. |
When manganese is present in water, it reduces the degree of hardness. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 71. |
When the chlorine is added beyond the break point, the process of treating the water is known as |
| A. | plain chlorination |
| B. | post-chlorination |
| C. | dechlorination |
| D. | super-chlorination |
| Answer» D. super-chlorination | |
| 72. |
The arithmetical increase method of forecasting population gives |
| A. | same value |
| B. | lesser value |
| C. | higher value |
| Answer» B. lesser value | |
| 73. |
The yield of a surface stream may be obtained by |
| A. | cross-section velocity method |
| B. | strem gauging |
| C. | chemical method |
| D. | all of these |
| Answer» D. all of these | |
| 74. |
The natural process in which the oxygen of water of streams is consumed by sewage and at the same time, it is replenished (filled again) by the atmosphere, is known as |
| A. | oxidation |
| B. | deoxidation |
| C. | self purification |
| D. | sedimentation |
| Answer» C. self purification | |
| 75. |
Biological action is used in |
| A. | screens |
| B. | sedimentation tanks |
| C. | trickling filters |
| D. | all of these |
| Answer» C. trickling filters | |
| 76. |
Slow sand filter is more efficient for the removal of |
| A. | bacteria |
| B. | odour |
| C. | turbidity |
| D. | all of these |
| Answer» A. bacteria | |
| 77. |
Water test is conducted for house plumbings. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 78. |
The average consumption of water for commercial use varies from 20 to 25% of total consumption. |
| A. | Yes |
| B. | No |
| Answer» A. Yes | |
| 79. |
The water obtained from the tube wells is known as |
| A. | surface water |
| B. | sub-surface water |
| C. | run-off |
| D. | potable water |
| Answer» B. sub-surface water | |
| 80. |
In lime soda process, the pH value of treated water is increased. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 81. |
The water obtianed from |
| A. | rains |
| B. | rivers |
| C. | reservoirs |
| D. | artesian wells |
| Answer» D. artesian wells | |
| 82. |
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» C. 80% to 90% | |
| 83. |
Wrought iron pipes are more costly and are |
| A. | less |
| B. | more |
| Answer» A. less | |
| 84. |
Suspended impurities consist of |
| A. | iron |
| B. | chlorine |
| C. | bacteria |
| D. | all of these |
| Answer» C. bacteria | |
| 85. |
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» A. an acquifer | |
| 86. |
The area of the openings in screens should be such that the velocity of flow through them does not exceed |
| A. | 0.75 to 1 m/s |
| B. | 1.5 to 3 m/s |
| C. | 3 to 5 m/s |
| D. | 5 to 6 m/s |
| Answer» A. 0.75 to 1 m/s | |
| 87. |
In secondary treatment of sewage, the operation which takes place is |
| A. | removal of heavier suspended inorganic material |
| B. | removal of fine dissolved organic material |
| C. | removal of harmful bacterias |
| D. | all of the above |
| Answer» B. removal of fine dissolved organic material | |
| 88. |
The presence of hydrogen sulphide in water causes |
| A. | softening |
| B. | alkalinity |
| C. | aciity |
| D. | bad taste |
| Answer» C. aciity | |
| 89. |
Which of the following statement is wrong? |
| A. | The quality of tube well water is better than that of surface sources. |
| B. | The discharge of tube well is more than that of an open well. |
| C. | The tube well should not derive water from the first pervious strata. |
| D. | none of the above |
| Answer» D. none of the above | |
| 90. |
The water from kitchens, bathrooms, wash basins is called |
| A. | sewage |
| B. | sullage |
| C. | raw sewage |
| D. | none of these |
| Answer» B. sullage | |
| 91. |
The pipe installed in the house or building drainage to preserve the water seal of a trap is called anti-siphonage pipe. |
| A. | Right |
| B. | Wrong |
| Answer» A. Right | |
| 92. |
Rapid sand filters are cheap and economical as compared to slow sand filters. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 93. |
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» B. ring system | |
| 94. |
Crystalline hydrates of 'Ice" of chlorine are formed at a temerature of |
| A. | below 10?C |
| B. | 15?C |
| C. | 20?C |
| D. | above 20?C |
| Answer» A. below 10?C | |
| 95. |
The coagulation is not required in |
| A. | slow sand |
| B. | rapid sand |
| Answer» A. slow sand | |
| 96. |
The detention time for an ordinary plain sedimentation tank is |
| A. | 1 to 2 hours |
| B. | 2 to 4 hours |
| C. | 6 to 8 hours |
| D. | 20 to 24 hours |
| Answer» C. 6 to 8 hours | |
| 97. |
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» B. decreases pH value of water | |
| 98. |
Which of the following statement is correct? |
| A. | Slow sand filters work under atmospheric pressure. |
| B. | Rapid sand filters require coagulation. |
| C. | Rapid sand filters should be cleaned after 2 to 3 days |
| D. | all of the above |
| Answer» D. all of the above | |
| 99. |
The quality of tube well water is |
| A. | good |
| B. | poor |
| Answer» A. good | |
| 100. |
Egg-shaped sewers are generally used for |
| A. | separate system |
| B. | combined system |
| C. | partially separate system |
| D. | all of these |
| Answer» D. all of these | |
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