McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 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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