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.
| 101. |
An aquiclude is |
| A. | a non artesian aquifer |
| B. | an artesian acquifer |
| C. | a confined bed of impervious material between acquifers |
| D. | a large water body under ground. |
| Answer» D. a large water body under ground. | |
| 102. |
The bed slope in slow sand filters, is generally kept |
| A. | 1 in 50 |
| B. | 1 in 75 |
| C. | 1 in 100 |
| D. | 0.180555556 |
| Answer» D. 0.180555556 | |
| 103. |
The type of pipe commonly used in water supply distribution schemes, is |
| A. | R.C.C. pipes |
| B. | Hume pipes |
| C. | Cast iron pipes |
| D. | G.I. pipes. |
| Answer» D. G.I. pipes. | |
| 104. |
The average domestic consumption under normal conditions in an Indian city per day per person, is |
| A. | 105 litres |
| B. | 115 litres |
| C. | 125 litres |
| D. | 135 litres |
| Answer» E. | |
| 105. |
For a network of distribution pipes of a proposed township shown in the below figure, the layout of distribution system, is |
| A. | dead end system |
| B. | grid-iron system |
| C. | ring system |
| D. | radial system. |
| Answer» E. | |
| 106. |
Pipes are laid parallel |
| A. | to increase the capacity of the water supply |
| B. | to provide a means of repairing without closing water supply |
| C. | to meet the requirement of excessive supply |
| D. | all the above. |
| Answer» E. | |
| 107. |
The maximum permissible hardness for public supplies is |
| A. | 95 mg/litre |
| B. | 105 mg/litre |
| C. | 115 mg/litre |
| D. | 125 mg/litre |
| Answer» D. 125 mg/litre | |
| 108. |
Detention time for plain sedimentation tank usually ranges from |
| A. | 2 to 4 hours |
| B. | 4 to 8 hours |
| C. | 6 to 10 hours |
| D. | 8 to 12 hours |
| Answer» C. 6 to 10 hours | |
| 109. |
Underground water is obtained from |
| A. | rains |
| B. | rivers |
| C. | lakes |
| D. | reservoirs |
| Answer» E. | |
| 110. |
Chemical coagulation of drinking water, is done |
| A. | to settle suspended materials |
| B. | to increase rate of settlement of suspended materials |
| C. | to remove the bacterias |
| D. | none of these. |
| Answer» C. to remove the bacterias | |
| 111. |
The main draw-back of centrifugal pump, is |
| A. | necessity of priming |
| B. | discharge from pump varies with the load of water |
| C. | for high heads, efficiency is low up to 50% |
| D. | the suction lift is limited to 6 m |
| Answer» E. | |
| 112. |
In rapid sand filters the ratio of length and diameter of the lateral, should not be greater than |
| A. | 10 |
| B. | 15 |
| C. | 20 |
| D. | 25 |
| Answer» D. 25 | |
| 113. |
The formula for pipe flows, suggested by, Hazen-William is |
| A. | |
| B. | V = 0.85 CH R0.63 . S0.54 |
| Answer» C. | |
| 114. |
Shales are |
| A. | porous |
| B. | permeable |
| C. | porous and permeable |
| D. | porous but not permeable |
| Answer» E. | |
| 115. |
Surface water may |
| A. | contain large amount of impurities |
| B. | be contaminated by impurities |
| C. | contain disease producing bacterias |
| D. | all the above. |
| Answer» E. | |
| 116. |
Flow through period, in sedimentation tanks, is |
| A. | equal to detention period |
| B. | more than detention period |
| C. | less than detention period |
| D. | detention period divided by displacement efficiency |
| Answer» D. detention period divided by displacement efficiency | |
| 117. |
Water having pH value as 6, is |
| A. | alkaline |
| B. | acidic |
| C. | neutral |
| D. | none of these. |
| Answer» C. neutral | |
| 118. |
While selecting the location of an intake for collecting surface water, the factor considered, is |
| A. | The intake point should be near as far as possible to the treatment plant |
| B. | The intake point should be in purer zone of the water source |
| C. | The intake point should be upstream of the point of disposal of waste water |
| D. | The intake point in meandering rivers should be on concave banks |
| Answer» E. | |
| 119. |
The maximum permitted loss of head in a rapid sand filter, is |
| A. | 1 m |
| B. | 2 m |
| C. | 3 m |
| D. | 4 m |
| Answer» D. 4 m | |
| 120. |
The nitrate concentration in domestic water supplies, is generally limited to |
| A. | 10 ppm |
| B. | 15 ppm |
| C. | 25 ppm |
| D. | 30 ppm |
| Answer» E. | |
| 121. |
To remove very fine suspended particles from water, the method adopted is |
| A. | screening |
| B. | sedimentation |
| C. | boiling |
| D. | filtration. |
| Answer» E. | |
| 122. |
The maximum permissible chloride content in treated water of public water supplies should not exceed |
| A. | 50 P.P.M. |
| B. | 100 P.P.M. |
| C. | 150 P.P.M. |
| D. | 200 P.P.M. |
| Answer» E. | |
| 123. |
Check valves are installed |
| A. | on the delivery side of the pumping set |
| B. | at the interconnections between polluted water system and a potable water system |
| C. | both (a) and (b) |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 124. |
Aqueducts are generally designed |
| A. | circular |
| B. | rectangular |
| C. | horse shoe section |
| D. | all the above. |
| Answer» E. | |
| 125. |
Steel pipe are |
| A. | suitable for withstanding high internal pressure |
| B. | connected by riveted or welded joints |
| C. | generally laid under ground and no expansion joint is required |
| D. | likely to last 100 years under ordinary conditions |
| Answer» E. | |
| 126. |
The maximum pressure to which a pipe is subjected to during its operation, is known |
| A. | working pressure |
| B. | design pressure |
| C. | test pressure |
| D. | pipe pressure |
| Answer» B. design pressure | |
| 127. |
High pH value of water does not produce |
| A. | incrustation |
| B. | sediment deposits |
| C. | turberculation |
| D. | corrosion |
| Answer» E. | |
| 128. |
By adding 1 ml of orthotolidine solution to 100 ml chlorinated water taken after contact period, the residual chlorine makes the colour of solution |
| A. | yellowish |
| B. | greenish |
| C. | bluish |
| D. | reddish |
| Answer» B. greenish | |
| 129. |
Abyssinian tube well is a special type of |
| A. | slotted type wells |
| B. | cavity type wells |
| C. | strainer type well |
| D. | none of these. |
| Answer» D. none of these. | |
| 130. |
Perched acquifers are generally found |
| A. | on the surface of the ground |
| B. | below the surface of the ground but above water table |
| C. | below the water table |
| D. | all the above. |
| Answer» C. below the water table | |
| 131. |
The maximum hourly consumption, is generally taken as |
| A. | 1.1 |
| B. | 1.2 |
| C. | 1.3 |
| D. | 1.4 |
| Answer» E. | |
| 132. |
The pH value of water is kept slightly less than 7 so that hydrochloride ions may combine with ammonia ions to form |
| A. | Mono-chloramine (NHCl) |
| B. | Di-chloramine (NH2Cl) |
| C. | Nitrogen trichloramine (NCl3) |
| D. | All the above. |
| Answer» E. | |
| 133. |
In centrifugal pump installation, |
| A. | pump is properly primed before starting |
| B. | the diameter of the pipe at inlet as well as at outlet, is kept smaller than the delivery pipe |
| C. | the foot valve fitted at the bottom end of the suction pipe, prevents the movement of water from the pump when it is stopped |
| D. | the motor may burn out if it is started with empty delivery pipe and with open gate valve |
| Answer» E. | |
| 134. |
The efficiency of a pumping set, is generally assumed |
| A. | 0.5 |
| B. | 0.55 |
| C. | 0.6 |
| D. | 0.65 |
| Answer» E. | |
| 135. |
The percentage of chlorine in fresh bleaching powder is roughly |
| A. | 50 to 60 |
| B. | 30 to 35 |
| C. | 40 to 50 |
| D. | 20 to 25 |
| Answer» C. 40 to 50 | |
| 136. |
The diameter of pipes in bath rooms and lavatories in domestic water supply, is |
| A. | 6 mm |
| B. | 12 mm |
| C. | 18 mm |
| D. | 24 mm. |
| Answer» C. 18 mm | |
| 137. |
A well is considered to be good if it is sunk into |
| A. | Clay |
| B. | Sand |
| C. | Coarse gravel |
| D. | Silt. |
| Answer» D. Silt. | |
| 138. |
Carbonates in water produce |
| A. | temporary hardness |
| B. | permanent hardness |
| C. | acidity |
| D. | alkanity. |
| Answer» B. permanent hardness | |
| 139. |
A city supply includes |
| A. | domestic water demand |
| B. | industrial and commercial water demands |
| C. | demand for public uses and fire |
| D. | water losses |
| Answer» E. | |
| 140. |
The bacterias which may survive with or without free oxygen, are called |
| A. | Aerobic bacterias |
| B. | Anaerobic bacterias |
| C. | Faculative bacteria's |
| D. | None of these. |
| Answer» D. None of these. | |
| 141. |
Slow sand filter is used if maximum turbidity of raw water is less than |
| A. | 10 gm/litre |
| B. | 20 gm/litre |
| C. | 30 gm/litre |
| D. | 40 gm/litre |
| Answer» E. | |
| 142. |
If P is population of a city in thousands and Q is fire demand in litres per minute, for proper estimate of water, the Empirical formula is suggested by |
| A. | National Board of fire under-writers |
| B. | Freeman |
| C. | Kuichling |
| D. | None of these. |
| Answer» C. Kuichling | |
| 143. |
A strainer type well sunk through three pervious layers intervened by three impervious aquicludes, draws water from |
| A. | top most pervious layer |
| B. | central pervious layer |
| C. | lowest pervious layer |
| D. | all the pervious layers. |
| Answer» E. | |
| 144. |
45 litres of water per person per day, is provided in |
| A. | office buildings |
| B. | hotels |
| C. | hostels |
| D. | nurse's homes. |
| Answer» B. hotels | |
| 145. |
Surface water is obtained from |
| A. | well |
| B. | springs |
| C. | artesian well |
| D. | rain. |
| Answer» E. | |
| 146. |
If intensity of rainfall in cm per hour is I, percentage coefficient of run-off is P, area of catchment in square kilometres is A, the total run-off Q, is given by |
| A. | Q = 1.758 x 102 x API |
| B. | Q = 2.758 x 102 x API |
| C. | Q = 2.758 x 103 x API |
| Answer» D. | |
| 147. |
Demand for public uses in a city, does not include water required for |
| A. | watering of public parks |
| B. | watering of public gardens |
| C. | sprickling on roads |
| D. | drinking purposes. |
| Answer» E. | |
| 148. |
When gravity and pumping systems of water distribution are adopted, the type of distribution reservoir, is |
| A. | elevated tank |
| B. | ground source reservoir |
| C. | intz tank |
| D. | stand pipe. |
| Answer» B. ground source reservoir | |
| 149. |
Mathamoglobinemia, or blue baby disease is caused due to |
| A. | chlorides |
| B. | nitrites |
| C. | nitrates |
| D. | sulphides. |
| Answer» D. sulphides. | |
| 150. |
To control the growth of algae in reservoirs, the compound which is used, is |
| A. | bleaching powder |
| B. | copper sulphate |
| C. | lime solution |
| D. | alum solution |
| Answer» C. lime solution | |