MCQOPTIONS
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MCQOPTIONS
This section includes 260 Mcqs, each offering curated multiple-choice questions to sharpen your Civil Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
*/*_A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is? |
| A. | 2.30 m |
| B. | 2.40 m |
| C. | 2.45 m |
| D. | 2.50 m |
| Answer» D. 2.50 m | |
| 52. |
*/*_The rational formula for peak drainage discharge, was evolved by? |
| A. | Fruhling |
| B. | Lloyd David |
| C. | Kuichling |
| D. | All of these |
| Answer» E. | |
| 53. |
*/*_Hume steel pipes are? |
| A. | Steel pipes |
| B. | Steel shell coated from inside with cement mortar |
| C. | Steel shell coated from outside with cement mortar |
| D. | Both B and C |
| Answer» E. | |
| 54. |
*/*_For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed? |
| A. | 1.5 |
| B. | 2.0 |
| C. | 2.5 |
| D. | 3.0 |
| Answer» B. 2.0 | |
| 55. |
*/*_The first stage of neutral process of sludge digestion, is? |
| A. | Acid fermentation |
| B. | Acid regression |
| C. | Alkaline fermentation |
| D. | None of these |
| Answer» B. Acid regression | |
| 56. |
*/*_In sewers the gas generally found, is? |
| A. | Hydrogen sulphide (H2S) |
| B. | Carbon dioxide (CO2) |
| C. | Methane (CH4) |
| D. | All the above |
| Answer» E. | |
| 57. |
*/*_For house drainage minimum gradient is? |
| A. | 1 in 60 |
| B. | 1 in 80 |
| C. | 1 in 10 |
| D. | 1 in 400 |
| Answer» B. 1 in 80 | |
| 58. |
*/*_In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is? |
| A. | 5 |
| B. | 10 |
| C. | 15 |
| D. | 20 |
| Answer» E. | |
| 59. |
*/*_Pathogens (or pathogenic bacterias) in water may cause? |
| A. | Typhoid |
| B. | Cholera |
| C. | Dysentery |
| D. | All the above |
| Answer» E. | |
| 60. |
*/*_In a trickling filter? |
| A. | Filtration process is used |
| B. | Biological action is used |
| C. | Neither A nor B |
| D. | Both A and B |
| Answer» C. Neither A nor B | |
| 61. |
*/*_The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be? |
| A. | 0.9 cm |
| B. | 1.2 m |
| C. | 1.5 m |
| D. | > 1.5 m |
| Answer» E. | |
| 62. |
*/*_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 | |
| 63. |
*/*_The recommended detention period for grit chambers is? |
| A. | 1 minute |
| B. | 2 minutes |
| C. | 3 minutes |
| D. | 5 minutes |
| Answer» B. 2 minutes | |
| 64. |
*/*_A manhole is classified as shallow if its depth is between? |
| A. | 0.4 to 0.5 m |
| B. | 0.5 to 0.7 m |
| C. | 0.7 to 0.9 m |
| D. | 0.9 to 1.20 m |
| Answer» D. 0.9 to 1.20 m | |
| 65. |
*/*_A manhole is generally provided at each? |
| A. | Bend |
| B. | Junction |
| C. | Change of gradient |
| D. | All the above |
| Answer» E. | |
| 66. |
*/*_If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is? |
| A. | 50 mg/l |
| B. | 100 mg/l |
| C. | 150 mg/l |
| D. | 250 mg/l |
| Answer» E. | |
| 67. |
*/*_Flocculated particles do not change their? |
| A. | Size |
| B. | Shape |
| C. | Weight |
| D. | None of these |
| Answer» E. | |
| 68. |
*/*_Nitrogen cycle of sewage, is? |
| A. | Liberation of ammonia-formation of nitrites-formation of nitrates-liberation of nitrogen |
| B. | Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates |
| C. | Liberation of nitrogen-formation of nitrates-formation of nitrites-liberation of ammonia |
| D. | Formation of nitrates-formation of nitrites-liberation of nitrates-liberation of nitrates |
| Answer» B. Liberation of nitrogen-liberation of ammonia-formation of nitrites- formation of nitrates | |
| 69. |
*/*_If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of? |
| A. | Degradation |
| B. | Active decomposition |
| C. | Recovery |
| D. | Cleaner water |
| Answer» C. Recovery | |
| 70. |
*/*_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 | |
| 71. |
*/*_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 | |
| 72. |
*/*_The maximum spacing of manholes specified by Indian standard in sewers upto 0.3 m diameter is? |
| A. | 20 m |
| B. | 30 m |
| C. | 45 m |
| D. | 75 m |
| Answer» D. 75 m | |
| 73. |
*/*_A circular sewer section is preferred to because? |
| A. | It is cheaper in construction |
| B. | It provides maximum area for a given perimeter |
| C. | It provides maximum hydraulic mean depth |
| D. | All the above |
| Answer» E. | |
| 74. |
*/*_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 | |
| 75. |
*/*_If is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is? |
| A. | 1.15 D |
| B. | 1.25 D |
| C. | 1.5 D |
| D. | 1.75 D |
| Answer» D. 1.75 D | |
| 76. |
*/*_House connections to the laterals is generally made by? |
| A. | R.C.C. |
| B. | P.C.C. |
| C. | Cast iron |
| D. | Glazed stonewares |
| Answer» E. | |
| 77. |
*/*_Antisyphonage pipe is fitted? |
| A. | At the end of septic tanks |
| B. | On manholes |
| C. | With a W.'trap |
| D. | At the beginning of sewer line |
| Answer» D. At the beginning of sewer line | |
| 78. |
%_Bottom openings 15 cm √ó 15 cm in the standing baffle wall are provided_% |
| A. | 15 cm c/c |
| B. | 22.5 cm c/c |
| C. | 30 cm c/c |
| D. | 50 cm c/c |
| Answer» C. 30 cm c/c | |
| 79. |
%_For detecting the nitrites in the sewage, the matching colour may be developed by adding_% |
| A. | Potassium permanganate |
| B. | Sulphuric acid and napthamine |
| C. | Phenol-di -sulphuric acid potassium hydroxide |
| D. | None of these |
| Answer» C. Phenol-di -sulphuric acid potassium hydroxide | |
| 80. |
%_When drainage to sewage ratio is 20, the peak dry weather flow is_% |
| A. | 20% of the design discharge |
| B. | Slightly less than 5% of the design discharge |
| C. | Slightly more than 5% of the design discharge |
| D. | None of these |
| Answer» C. Slightly more than 5% of the design discharge | |
| 81. |
%_In olden days the type of section adopted in trunk and out fall sewers was_% |
| A. | Parabolic shaped |
| B. | Horse shoe shaped |
| C. | Egg shaped |
| D. | Circular shaped |
| Answer» C. Egg shaped | |
| 82. |
%_If is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is_% |
| A. | 1.250 D |
| B. | 1.350 D |
| C. | 1.425 D |
| D. | 1.625 D |
| Answer» E. | |
| 83. |
%_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 | |
| 84. |
%_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 | |
| 85. |
%_pH value of sludge during alkaline regression stage, is_% |
| A. | More than 7 |
| B. | Less than 7 |
| C. | Less than 6 |
| D. | More than 6 |
| Answer» B. Less than 7 | |
| 86. |
%_You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at_% |
| A. | Full depth |
| B. | Half full |
| C. | Two third full |
| D. | Three fourth full |
| Answer» C. Two third full | |
| 87. |
%_For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by_% |
| A. | Kinchling |
| B. | Lloyd Davis |
| C. | Frubling |
| D. | All the above |
| Answer» E. | |
| 88. |
%_Dry weather flow is:_% |
| A. | Average daily rate of flow |
| B. | Average monthly rate of flow |
| C. | Average annual rate of flow |
| D. | Water supply allowance per capita |
| Answer» E. | |
| 89. |
%_Aerobic bacterias_% |
| A. | Flourish in the presence of free oxygen |
| B. | Consume organic matter as their food |
| C. | Oxidise organic matter in sewage |
| D. | All the above |
| Answer» E. | |
| 90. |
%_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. | |
| 91. |
%_Aerobic activity is maximum_% |
| A. | In freshly produced sewage |
| B. | At sewer pipes |
| C. | In sewer treatment plants |
| D. | None of these |
| Answer» B. At sewer pipes | |
| 92. |
%_The detention period for plain sedimentation water tanks, is usually_% |
| A. | 4 to 8 hours |
| B. | 8 to 16 hours |
| C. | 16 to 24 hours |
| D. | 24 to 36 hours |
| Answer» B. 8 to 16 hours | |
| 93. |
%_The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is_% |
| A. | 20 cm |
| B. | 25 cm |
| C. | 40 cm |
| D. | 50 cm |
| Answer» E. | |
| 94. |
%_In sewers the highest non-scouring velocity is achieved in_% |
| A. | Glazed bricks sewers |
| B. | Cast iron sewers |
| C. | Cement concrete sewers |
| D. | Stone ware sewers |
| Answer» B. Cast iron sewers | |
| 95. |
_ The intensity of rain is expressed in$? |
| A. | cm/minute |
| B. | cm/hour |
| C. | cm/day |
| D. | None of these |
| Answer» C. cm/day | |
| 96. |
_ The underground sewers are more subjected to$? |
| A. | Tensile force |
| B. | Compressive force |
| C. | Bending force |
| D. | Shearing force |
| Answer» C. Bending force | |
| 97. |
_ The most widely used pump for lifting sewage is$? |
| A. | Centrifugal pump |
| B. | Reciprocating pump |
| C. | Pneumatic ejector |
| D. | Air pressure pump |
| Answer» B. Reciprocating pump | |
| 98. |
_ Sludge banks are formed if sewage is disposed of in$? |
| A. | Rivers |
| B. | Seas |
| C. | Lakes |
| D. | None of these |
| Answer» C. Lakes | |
| 99. |
_ The settlement of a particle in sedimentation tank, is affected by$? |
| A. | Velocity of flow |
| B. | Viscosity of water |
| C. | Size and shape of solid |
| D. | All the above |
| Answer» E. | |
| 100. |
_ The maximum diameter of sewers adopted in the designs is$? |
| A. | 1.0 m |
| B. | 2.0 m |
| C. | 3.0 m |
| D. | 4.0 m |
| Answer» D. 4.0 m | |