MCQOPTIONS
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MCQOPTIONS
This section includes 344 Mcqs, each offering curated multiple-choice questions to sharpen your Surveying knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
For drains up to 15 cumecs, the depth d and width B are related by |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 52. |
The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock's law, is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 53. |
The following formula used for determining flow velocities in sewers, is known as |
| A. | Chezy's formula |
| B. | Bazin's formula |
| C. | Kutter's formula |
| D. | Manning's formula |
| Answer» E. | |
| 54. |
If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is |
| A. | 2 hours |
| B. | 3 hours |
| C. | 4 hours |
| D. | 5 hours. |
| Answer» D. 5 hours. | |
| 55. |
For treating the sewage of a large city, you will recommend |
| A. | a sedimentation tank and an activated sludge treatment plant |
| B. | a plant consisting of Imhoff tanks with low rate trickling filters |
| C. | sedimentation tanks with high rate trickling filters |
| D. | none of these. |
| Answer» B. a plant consisting of Imhoff tanks with low rate trickling filters | |
| 56. |
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 | |
| 57. |
For evaporation and measurement of settlable solids, the apparatus used, is |
| A. | a jar |
| B. | a breaker |
| C. | a test tube |
| D. | an Imhoff cone. |
| Answer» E. | |
| 58. |
During putrifaction process of sewage the gas given off, is |
| A. | carbon dioxide |
| B. | hydrogen |
| C. | ammonia |
| D. | all the above. |
| Answer» E. | |
| 59. |
In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is |
| A. | 2.25 |
| B. | 2.50 |
| C. | 2.55 |
| D. | 2.65 |
| Answer» E. | |
| 60. |
The design period of sewage treatment works in normally |
| A. | 5 - 10 years |
| B. | 15 - 20 years |
| C. | 30 - 40 years |
| D. | 40 - 50 years. |
| Answer» C. 30 - 40 years | |
| 61. |
The Chezy's constant C in the formula V = C √rs depends upon |
| A. | size of the sewer |
| B. | shape of the sewer |
| C. | roughness of sewer surface |
| D. | all the above. |
| Answer» E. | |
| 62. |
Which one of the following resists hydrogen sulphide corrosion |
| A. | R.C.C. |
| B. | Glazed stone wares |
| C. | Asbestos cement |
| D. | Glazed ware. |
| Answer» E. | |
| 63. |
Sluge banks are formed if sewage is disposed of in |
| A. | rivers |
| B. | seas |
| C. | lakes |
| D. | none of these. |
| Answer» C. lakes | |
| 64. |
Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is |
| A. | centrifugal pump |
| B. | pneumatic ejector |
| C. | reciprocating pump |
| D. | none of these. |
| Answer» B. pneumatic ejector | |
| 65. |
Boussinesq's equation for ascertaining unit pressure at a depth H on sewers due to traffic loads, is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 66. |
If γw is the unit weight of water, r the hydraulic mean depth of the sewer and S the bed slope of the sewer, then the tractive force exerted by flowing water, is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 67. |
Hazin's formula given by following equation is used for the settlement velocity of the particles of diameter |
| A. | less than 0.01 mm |
| B. | less than 0.05 mm |
| C. | less than 0.1 mm |
| D. | greater than 0.1 mm |
| Answer» E. | |
| 68. |
The drainage area of a town is 12 hectares. Its 40% area is hard pavement (K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/t+60 the maximum run off is |
| A. | 0.10 cumec |
| B. | 0.12 cumec |
| C. | 0.15 cumec |
| D. | 0.20 cumec. |
| Answer» D. 0.20 cumec. | |
| 69. |
A rainfall may be classified as acidic if its pH value is less or equal to |
| A. | 6 |
| B. | 7 |
| C. | 5 |
| D. | 6.5 |
| Answer» D. 6.5 | |
| 70. |
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity, is |
| A. | 1 in 60 |
| B. | 1 in 100 |
| C. | 1 in 120 |
| D. | none of these. |
| Answer» B. 1 in 100 | |
| 71. |
Which one of the following part of human body withstands minimum radiation |
| A. | thyroid |
| B. | kidneys |
| C. | eyes |
| D. | ovaries/testis. |
| Answer» E. | |
| 72. |
In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time |
| A. | 100 mm dia. |
| B. | 150 mm dia. |
| C. | 225 mm dia. |
| D. | all of these. |
| Answer» D. all of these. | |
| 73. |
The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is |
| A. | 1.5 |
| B. | 2.0 |
| C. | 3.0 |
| D. | 4.0 |
| Answer» C. 3.0 | |
| 74. |
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. | |
| 75. |
The coagulant widely used for sewage treatment, is |
| A. | alum |
| B. | ferric chloride |
| C. | ferric sulphate |
| D. | chlorinated copperas. |
| Answer» C. ferric sulphate | |
| 76. |
The value of Chezy's constant is used in |
| A. | Chezy's formula |
| B. | Bazin's formula |
| C. | Kutter's |
| D. | Manning's formula |
| Answer» D. Manning's formula | |
| 77. |
If D is the diameter of upper circular portion, the area of cross-section of a standard egg shaped sewer, is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 78. |
The ratio of depths at partial flow with central angle α and at full flow of a sewer, is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 79. |
For the open drain (N = 0.025) shown in the below figure, the discharge is |
| A. | 26.88 cumecs |
| B. | 27.88 cumecs |
| C. | 28.88 cumecs |
| D. | 29.88 cumecs |
| Answer» D. 29.88 cumecs | |
| 80. |
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 | |
| 81. |
The value of Chezy’s constant C = 157.6/(1.81 + K/ ) is used in |
| A. | Chezy’s formula |
| B. | Bazin’s formula |
| C. | Kutter’s formula |
| D. | Manning’s formula |
| Answer» C. Kutter’s formula | |
| 82. |
In trickling filter, B.O.D. is reduced to |
| A. | 30 to 40% |
| B. | 40 to 60% |
| C. | 60 to 80% |
| D. | 80 to 90% |
| Answer» D. 80 to 90% | |
| 83. |
It is customary to design a sewer for D.W.F. on the basis of |
| A. | Average demand |
| B. | Twice the average demand |
| C. | Thrice the average demand |
| D. | Four times the average demand |
| Answer» D. Four times the average demand | |
| 84. |
Drop manholes at the junctions of sewer lines, are provided if |
| A. | Invert level of a branch sewer is more than 60 cm that of the main sewer |
| B. | Sewer line runs along a main road |
| C. | Ordinary manhole cannot be built |
| D. | Two sewer lines intersect |
| Answer» B. Sewer line runs along a main road | |
| 85. |
For laying a sewer line in a trench of 2 m width, an offset line is marked on the ground parallel to the given centre line at a distance of |
| A. | 100 cm |
| B. | 120 cm |
| C. | 140 cm |
| D. | 160 cm |
| Answer» E. | |
| 86. |
Drop manholes are the manholes |
| A. | Without entry ladders |
| B. | Without manhole covers |
| C. | With depths more than 3.5 m |
| D. | Having drains at different levels |
| Answer» E. | |
| 87. |
The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope |
| A. | 1 in 5 |
| B. | 1 in 10 |
| C. | 1 in 15 |
| D. | 1 in 20 |
| Answer» C. 1 in 15 | |
| 88. |
5 days-biochemical oxygen demand (BOD5) is taken at a temperature of |
| A. | 0°C |
| B. | 15°C |
| C. | 20°C |
| D. | 25°C |
| Answer» D. 25°C | |
| 89. |
The effluent of a septic tank is |
| A. | Fit for discharge into any open drain |
| B. | Foul and contains dissolved and suspended solids |
| C. | As good as that from a complete treatment |
| D. | None of these |
| Answer» B. Foul and contains dissolved and suspended solids | |
| 90. |
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 | |
| 91. |
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. | |
| 92. |
Maximum permissible velocity 1.5 m/sec, is adopted in drains |
| A. | With beds of rocks and gravels |
| B. | Lined with stones |
| C. | Both A. and B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 93. |
In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is |
| A. | Q/(B × D) |
| B. | Q/(L × D) |
| C. | Q/L |
| D. | Q/(B × L) |
| Answer» E. | |
| 94. |
If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by |
| A. | Chezy |
| B. | Manning |
| C. | Bazin |
| D. | Kutter |
| Answer» C. Bazin | |
| 95. |
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 | |
| 96. |
Dried sewage after treatment is used as |
| A. | Fertilizer |
| B. | Building material |
| C. | Chemical for lowering B.O.D. |
| D. | Base material for paints |
| Answer» B. Building material | |
| 97. |
The standard B.O.D. of water is taken for |
| A. | 1 day |
| B. | 2 days |
| C. | 3 days |
| D. | 5 days |
| Answer» E. | |
| 98. |
Which one of the following gases is most significant as air pollutant? |
| A. | Carbondioxide |
| B. | Oxygen |
| C. | Nitrogen |
| D. | Sulphur-dioxide |
| Answer» E. | |
| 99. |
To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is |
| A. | 0.50 m/sec |
| B. | 0.60 m/sec |
| C. | 0.70 m/sec |
| D. | 0.75 m/sec |
| Answer» E. | |
| 100. |
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 | |