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 slow sand filter is cleaned if its filter head is higher than |
| A. | 10 cm to 20 cm |
| B. | 20 cm to 40 cm |
| C. | 40 cm to 70 cm |
| D. | 70 cm to 120 cm |
| Answer» E. | |
| 52. |
De-chlorination is followed by |
| A. | post-chlorination |
| B. | pre-chlorination |
| C. | double-chlorination |
| D. | super-chlorination. |
| Answer» E. | |
| 53. |
Maximum permissible colour for domestic water supplies, based on Cobalt scale, is |
| A. | 5 P.P.M. |
| B. | 10 P.P.M. |
| C. | 15 P.P.M. |
| D. | 20 P.P.M. |
| Answer» E. | |
| 54. |
The maximum non-verticality of the bore of a well 200 m deep, may be permitted up to |
| A. | 25 cm |
| B. | 50 cm |
| C. | 75 cm |
| D. | 100 cm |
| Answer» E. | |
| 55. |
Specific capacity or yield of wells, is generally expressed, as |
| A. | m3 per sec |
| B. | m3/hour |
| C. | m3/hour/m2 |
| D. | m3/hour/m2/m |
| Answer» E. | |
| 56. |
Chlorination of water does not remove |
| A. | ammonia content |
| B. | B.O.D. |
| C. | organic matter content |
| D. | dissolved oxygen. |
| Answer» E. | |
| 57. |
The four major water supply distribution systems, are |
| A. | dead end, tree, grid iron and reticulation |
| B. | dead end, tree, grid iron and circular |
| C. | tree, grid iron, ring and radial |
| D. | tree, reticulation, circular and ring. |
| Answer» D. tree, reticulation, circular and ring. | |
| 58. |
Disinfection of drinking water is done to remove |
| A. | turbidity |
| B. | odour |
| C. | colour |
| D. | bacterias |
| Answer» E. | |
| 59. |
The main process to purify water by filtration, is |
| A. | mechanical straining |
| B. | flocculation and sedimentation |
| C. | biological metabolism |
| D. | electronic change |
| Answer» E. | |
| 60. |
Service connections to consumers houses, are generally provided with |
| A. | copper pipes |
| B. | hume pipes |
| C. | galvanised iron pipes |
| D. | P.V.C. pipes |
| Answer» D. P.V.C. pipes | |
| 61. |
The ratio of total capacity and dead storage is kept |
| A. | 8 |
| B. | 6 |
| C. | 4 |
| D. | 3 |
| Answer» D. 3 | |
| 62. |
Non-pathogenic bacterias cause the following water borne disease, |
| A. | cholera |
| B. | typhoid |
| C. | infections hepatitis |
| D. | none of these. |
| Answer» E. | |
| 63. |
Derivation of Thiem's formula is based on the assumption |
| A. | the aquifer is homogeneous, isotropic and of infinite depth and area |
| B. | the well is sunk through the full depth of the aquifer |
| C. | the flow lines are radial and horizontal, and the flow is laminar |
| D. | for hydraulic gradient in Darcy's equation, tangent value is used for sine value |
| Answer» E. | |
| 64. |
Gravity conduits for carrying water from the source are |
| A. | canals |
| B. | flumes |
| C. | acqueducts |
| D. | all the above. |
| Answer» E. | |
| 65. |
The most important and widely used tube well in India, is |
| A. | strainer well |
| B. | cavity well |
| C. | slotted well |
| D. | perforated pipe well. |
| Answer» B. cavity well | |
| 66. |
Water may not contain much impurities if its source is |
| A. | reservoirs |
| B. | stream flowing in plains |
| C. | lakes in lower regions |
| D. | spring along hill slopes |
| Answer» E. | |
| 67. |
Hardness of water is caused by |
| A. | presence of soap lather |
| B. | presence of chlorides and sulphates of sodium and potassium |
| C. | presence of bicarbonates, sulphates or chlorides of calcium and magnesium |
| D. | turbidity. |
| Answer» D. turbidity. | |
| 68. |
From the surface of reservoir, evaporation may be minimised by sprinkling |
| A. | Spirit |
| B. | Hydrochloric acid |
| C. | Acetyl alcohol |
| D. | Methane |
| Answer» D. Methane | |
| 69. |
The total domestic consumption in a city water supply, is assumed |
| A. | 0.2 |
| B. | 0.3 |
| C. | 0.4 |
| D. | 60%. |
| Answer» E. | |
| 70. |
The chloride content of treated water for public supplies should not exceed |
| A. | 100 ppm |
| B. | 150 ppm |
| C. | 200 ppm |
| D. | 250 ppm |
| Answer» E. | |
| 71. |
If n is porosity, y is specific yield and r is specific retention of any soil, the relationship which holds good, is |
| A. | n + y + r = 1 |
| B. | n + y = r |
| C. | n + r = y |
| D. | y + r = n |
| Answer» E. | |
| 72. |
The dilution ratio at which the odour is hardly detectable is generally called threshold odour number and for public supplies it should not exceed |
| A. | 3 |
| B. | 5 |
| C. | 7 |
| D. | 9 |
| Answer» B. 5 | |
| 73. |
The formula Q = P - K[1.8T + 32] in which Q is runoff, P is annual rain fall in cm, T is mean annual temperature in centigrades and K is a constant, is known |
| A. | Justin's formula |
| B. | Khosla's formula |
| C. | English formula |
| D. | Vermule's formula. |
| Answer» C. English formula | |
| 74. |
Reciprocating pumps |
| A. | are not suitable for variable heads |
| B. | are four times costlier than centrifugal pumps |
| C. | are not suitable for pumping water containing sediments |
| D. | single stroke produce pulsating flow |
| Answer» B. are four times costlier than centrifugal pumps | |
| 75. |
Turbidity of water is expressed |
| A. | in ppm |
| B. | in numbers in an arbitrary scale |
| C. | by pH value |
| D. | by colour code. |
| Answer» B. in numbers in an arbitrary scale | |
| 76. |
The capability of a soil mass of full width and depth to transmit water, is known |
| A. | porosity |
| B. | permeability |
| C. | transmissibility |
| D. | none of these. |
| Answer» C. transmissibility | |
| 77. |
An earth formation which, although porous and capable of absoring water does not provide an appreciable supply to wells, is known as |
| A. | acquifer |
| B. | aquiclude |
| C. | aquifuge |
| D. | none of these. |
| Answer» C. aquifuge | |
| 78. |
Alum is chemically |
| A. | Copper sulphate |
| B. | Aluminium sulphate |
| C. | Ferrous sulphate |
| D. | Ferric sulphate. |
| Answer» C. Ferrous sulphate | |
| 79. |
The requirement of water per capita per day, is |
| A. | 90 litres |
| B. | 150 litres |
| C. | 250 litres |
| D. | 400 litres. |
| Answer» B. 150 litres | |
| 80. |
The lowest outlet sluice in a dam is provided |
| A. | below the dead storage |
| B. | on the top level of dead storage |
| C. | on the top level of useful storage |
| D. | at the centre of the dam. |
| Answer» C. on the top level of useful storage | |
| 81. |
The ensure proper growth of children's teeth, the quantity of flouride used in water mains, is |
| A. | 1 mg/litre |
| B. | 2 mg/litre |
| C. | 3 mg/litre |
| D. | 4 mg/litre |
| Answer» B. 2 mg/litre | |
| 82. |
The population of a city in 2000 is 50, 000. The average per decade of the previous records of population is 5000 and average percentage per decade is 20%. The population of the city based on geometrical increase method, in the year 2020 will be |
| A. | 56, 000 |
| B. | 60, 000 |
| C. | 64, 000 |
| D. | 70, 000 |
| Answer» E. | |
| 83. |
The best quality of filter material is obtained from quartzite if it does not loose weight when placed in hydro-chloric acid for 24 hours, more than |
| A. | 0.05 |
| B. | 0.08 |
| C. | 0.1 |
| D. | 0.12 |
| Answer» B. 0.08 | |
| 84. |
Alkalinity in water may be caused due to |
| A. | calcium and magnesium bicarbonates |
| B. | sodium carbonate |
| C. | potassium carbonate |
| D. | calcium hydroxide |
| Answer» E. | |
| 85. |
In plain sedimentation tanks under normal conditions, impurities are removed upto |
| A. | 0.6 |
| B. | 0.7 |
| C. | 0.8 |
| D. | 90%. |
| Answer» C. 0.8 | |
| 86. |
To pump water from a water reservoir 3 m deep and maximum water level at 135 m, a pump is installed to lift water up to R.L. 175 m at a constant rate of 36, 00, 000 litres per hour. If the length of the pipe is 1506 m and f = 0.01, ignoring other minor losses and assuming the economical diameter from Lea's formula D = 1.2 Q, the water horse power of the pump is |
| A. | 400 |
| B. | 450 |
| C. | 500 |
| D. | 580 |
| Answer» E. | |
| 87. |
Grade aqueducts are not allowed to run |
| A. | full |
| B. | th full |
| C. | full |
| D. | th full. |
| Answer» B. th full | |
| 88. |
For a city developed haphazardly, the layout of distribution pipes preferred to, is |
| A. | ring system |
| B. | radial system |
| C. | grid iron system |
| D. | dead end system. |
| Answer» E. | |
| 89. |
Cast iron pipes are generally preferred to, because |
| A. | of moderate cost |
| B. | of ease to join |
| C. | of durability |
| D. | of longer life |
| Answer» E. | |
| 90. |
Hardness of water can be removed by boiling if it is due to |
| A. | calcium bicarbonates |
| B. | calcium sulphates |
| C. | calcium chloride |
| D. | calcium nitrates. |
| Answer» B. calcium sulphates | |
| 91. |
Higher yield may be expected from |
| A. | gravity springs |
| B. | surface springs |
| C. | artesian springs |
| D. | all the above. |
| Answer» D. all the above. | |
| 92. |
Quality of water is said to be good if it is |
| A. | free from suspended matter |
| B. | colourless |
| C. | free from pathogenic organism |
| D. | tasteless |
| Answer» E. | |
| 93. |
Turbidity of water may be caused due to |
| A. | Suspended clay |
| B. | Suspended silt |
| C. | finely divided organic material |
| D. | all the above. |
| Answer» E. | |
| 94. |
The gaseous form of chlorine gets converted into liquid form when subjected to a pressure of |
| A. | 5 kg/cm2 |
| B. | 6 kg/cm2 |
| C. | 7 kg/cm2 |
| D. | 8 kg/cm2 |
| Answer» D. 8 kg/cm2 | |
| 95. |
m and n are monsoon duration factor and catchment factor respectively. If P is yearly rainfall in cm, runoff can be calculated by |
| A. | velocity area method |
| B. | weir or spillway method |
| C. | use of venturi-meter |
| D. | using power plant consumption |
| Answer» B. weir or spillway method | |
| 96. |
Disinfection of water with ozone is not good because |
| A. | it vanishes before water reaches the consumers |
| B. | it removes the colour, taste and odour from water as bacterias |
| C. | it adds taste to the water |
| D. | it is more efficient than chlorine in killing bacterias |
| Answer» E. | |
| 97. |
For 3.25 x 10-2 cumecs discharging from a well, a pump is installed to lift water against a total head of 30 m. The minimum required horse power, is |
| A. | 10 H.P. |
| B. | 15 H.P. |
| C. | 18 H.P. |
| D. | 20 H.P. |
| Answer» E. | |
| 98. |
The valve shown in the below figure, is generally known as |
| A. | air valve |
| B. | pressure relief valve |
| C. | sluice valve |
| D. | none of these. |
| Answer» C. sluice valve | |
| 99. |
Water is supplied from the source to the treatment plant under gravity in |
| A. | Calcutta |
| B. | Delhi |
| C. | Madras |
| D. | Bombay. |
| Answer» E. | |
| 100. |
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» E. | |