MCQOPTIONS
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MCQOPTIONS
This section includes 140 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. |
Rapid gravity filters |
| A. | Were developed by G.W. Fuller |
| B. | Make use of coarser sand with effective size as 0.5 mm |
| C. | Yield as high as 30 times the yield of slow sand filters |
| D. | All the above |
| Answer» E. | |
| 102. |
If G is the specific gravity of particles of diameter d, the velocity of settlement V in still water at T°C, according to Stoke's law, is |
| A. | V = 418 (G - 1) d² [(3T + 70)/100] |
| B. | V = 418 (G - 1) d [(3T - 70)/100] |
| C. | V = 418 (G - 1) d² [(2T + 70)/100] |
| D. | V = 418 (G - 1) d 4 [(3T + 70)/100] |
| Answer» B. V = 418 (G - 1) d [(3T - 70)/100] | |
| 103. |
The difference in the reservoir level and the lowest point of the water mains is 180 m. The expected pressure due to water hammer is 7.5 kg/cm2 in a pressure conduit of diameter 1 m. Assuming the efficiency of the riveted joints of the pipe as 0.6 and minimum cover 3 mm for corrosion, the thickness of the pipe materials, is |
| A. | 10 mm |
| B. | 15 mm |
| C. | 20 mm |
| D. | 25 mm |
| Answer» D. 25 mm | |
| 104. |
If L, B and D length, breadth and depth of water in a rectangular sedimentation tank of total discharge Q, the settling velocity, is |
| A. | Q/H |
| B. | Q/D |
| C. | Q/(D × B) |
| D. | Q/(L × B) |
| Answer» E. | |
| 105. |
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 tri-chloramine (NCl3) |
| D. | All the above |
| Answer» E. | |
| 106. |
A city supply includes |
| A. | Domestic water demand |
| B. | Industrial and commercial water demands |
| C. | Demand for public uses and fire |
| D. | All the above |
| Answer» E. | |
| 107. |
Plain chlorination is used for water |
| A. | Obtained from clear lakes |
| B. | Consumed during emergencies |
| C. | Supplies to armies during war |
| D. | All the above |
| Answer» E. | |
| 108. |
Property of earth to allow water to pass through it, is known as |
| A. | Perviousness |
| B. | Porosity |
| C. | Permeability |
| D. | Transmissibility |
| Answer» B. Porosity | |
| 109. |
An earth formation which, although porous and capable of absorbing water does not provide an appreciable supply to wells, is known as |
| A. | Aquifer |
| B. | Aquiclude |
| C. | Aquifuge |
| D. | None of these |
| Answer» C. Aquifuge | |
| 110. |
For calculation of economical diameter D of a pipe in metres for a discharge Q to be pumped in cumecs, Lea suggested the empirical formula |
| A. | D = 0.22 Q |
| B. | D = 1.22 Q |
| C. | D = 2.22 Q |
| D. | D = 3.22 Q |
| Answer» C. D = 2.22 Q | |
| 111. |
The chlorine supply cylinders are generally kept at 38°C to 40°C to prevent |
| A. | Conversion into crystals |
| B. | It from burning |
| C. | It from explosion |
| D. | None of these |
| Answer» B. It from burning | |
| 112. |
Time of concentration |
| A. | Is the time taken, for precipitation |
| B. | Duration of rainfall |
| C. | Time taken for all the ran off to reach the drain |
| D. | Time taken for the storm water to travel from the most remote point to the drain |
| Answer» E. | |
| 113. |
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 | |
| 114. |
'Shrouding' is essentially provided in |
| A. | Strainer type wells |
| B. | Cavity type wells |
| C. | Slotted type well |
| D. | All the above |
| Answer» D. All the above | |
| 115. |
Normal values of overflow rate for plain sedimentation tank, is |
| A. | 250 to 500 litres/hr/m2 |
| B. | 500 to 750 litres/hr/m2 |
| C. | 750 to 1000 litres/hr/m2 |
| D. | 1000 to 1250 litres/hr/m2 |
| Answer» C. 750 to 1000 litres/hr/m2 | |
| 116. |
Suction lift of a pump depends upon |
| A. | Atmospheric pressure |
| B. | Water temperature |
| C. | Velocity of water in suction pipe |
| D. | All the above |
| Answer» E. | |
| 117. |
A centrifugal pump is required to be primed before starting if it is located |
| A. | At higher level than water level of reservoir |
| B. | At lower level than water level of reservoir |
| C. | Both (a) and (b) |
| D. | Neither (a) nor (b) |
| Answer» B. At lower level than water level of reservoir | |
| 118. |
Mostly used coagulant, is |
| A. | Chlorine |
| B. | Alum |
| C. | Lime |
| D. | Bleaching powder |
| Answer» C. Lime | |
| 119. |
Perched aquifers 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 | |
| 120. |
The water level in an open well was depressed by pumping 2.5 m and recuperated 2.87 m in 3 hours and 50 minutes. The yield of the well per minute is |
| A. | 0.0033 |
| B. | 0.0044 |
| C. | 0.0055 |
| D. | 0.0066 |
| Answer» D. 0.0066 | |
| 121. |
The bed slope in slow sand filters, is generally kept |
| A. | 1 in 50 |
| B. | 1 in 75 |
| C. | 1 in 100 |
| D. | 1 : 200 |
| Answer» D. 1 : 200 | |
| 122. |
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 centigrade and K is a constant, is known |
| A. | Justins formula |
| B. | Khoslas formula |
| C. | English formula |
| D. | Vermules formula |
| Answer» C. English formula | |
| 123. |
The main disadvantage of hard water, is |
| A. | Greater soap consumption |
| B. | Scaling of boilers |
| C. | Corrosion and incrustation of pipes |
| D. | All the above |
| Answer» E. | |
| 124. |
Gravity conduits are generally in the form of |
| A. | Canals |
| B. | Flumes |
| C. | Aqueduct |
| D. | All the above |
| Answer» E. | |
| 125. |
The bacterias which require free oxygen for their survival, are called |
| A. | Aerobic bacterias |
| B. | Anaerobic bacterias |
| C. | Facultative bacteria |
| D. | None of these |
| Answer» B. Anaerobic bacterias | |
| 126. |
A pressure conduit laid underground, may not be subjected to |
| A. | Internal pressure of water |
| B. | Pressure due to external load |
| C. | Longitudinal temperature stress |
| D. | Longitudinal stresses due to unbalanced pressure to bends |
| Answer» D. Longitudinal stresses due to unbalanced pressure to bends | |
| 127. |
The population of a city in 2000 is 50,000. The average increase in population over last 8 decades is 7500 and average incremental increase during 8 decades is 750. The population of the city based on incremental method, in the year 2020 will be |
| A. | 55,000 |
| B. | 60,500 |
| C. | 66,500 |
| D. | 72,500 |
| Answer» D. 72,500 | |
| 128. |
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 | |
| 129. |
Mathamoglobinemia or blue baby disease is caused due to |
| A. | Chlorides |
| B. | Nitrites |
| C. | Nitrates |
| D. | Sulphides |
| Answer» D. Sulphides | |
| 130. |
For the prediction of future population of a city, the factor to be considered, is |
| A. | Births |
| B. | Deaths |
| C. | Migrants |
| D. | All the above |
| Answer» E. | |
| 131. |
The process of passing water through beds of granular materials, is called |
| A. | Screening |
| B. | Sedimentation |
| C. | Filtration |
| D. | None of these |
| Answer» D. None of these | |
| 132. |
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 motor may burn out if it is started with empty delivery pipe and with open gate valve |
| D. | All the above |
| Answer» E. | |
| 133. |
The expected discharge to be obtained from an open well sunk in coarse sand is 0.0059 cumec. If the working depression head of the well is 3 m, the minimum diameter of the well, is |
| A. | 2 m |
| B. | 2.25 m |
| C. | 2.50 m |
| D. | 3.00 m |
| Answer» E. | |
| 134. |
If the chosen diameter of a pipe, is less than the economical diameter |
| A. | Cost of pipe will be less |
| B. | Head loss will be high |
| C. | Cost of pumping will be more than saving |
| D. | All the above |
| Answer» E. | |
| 135. |
Turbidity of raw water is a measure of |
| A. | Suspended solids |
| B. | Acidity of water |
| C. | B.O.D. |
| D. | None of these |
| Answer» B. Acidity of water | |
| 136. |
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. | 600 |
| Answer» E. | |
| 137. |
Specific capacity or yield of wells, is generally expressed, as |
| A. | m 3 per sec |
| B. | m 3 /hour |
| C. | m 3 /hour/m2 |
| D. | m 3 /hour/m2 /m |
| Answer» E. | |
| 138. |
In pressure supply mains, water hammer pressure is reduced by providing |
| A. | Sluice valves |
| B. | Air valves |
| C. | Pressure relief valves |
| D. | None of these |
| Answer» D. None of these | |
| 139. |
Surcharge storage zone of a reservoir, is |
| A. | Below dead storage |
| B. | Between dead storage and useful storage |
| C. | Above useful storage |
| D. | Also known as valley storage |
| Answer» D. Also known as valley storage | |
| 140. |
When the reduced level of the water source is higher than the reduced level of the consumer's place, water is generally supplied |
| A. | By pumping system |
| B. | By gravitational system |
| C. | Both (a) and (b) |
| D. | All the above |
| Answer» C. Both (a) and (b) | |