McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 201. |
After cleaning a slow sand filter, the filtered water is not used for |
| A. | 6 hours to 12 hours |
| B. | 12 hours to 18 hours |
| C. | 18 hours to 24 hours |
| D. | 24 hours to 36 hours |
| Answer» D. 24 hours to 36 hours | |
| 202. |
The efficiency of sedimentation tank does not depend upon |
| A. | Depth of tank |
| B. | Length of tank |
| C. | Detention period |
| D. | Velocity of water |
| Answer» D. Velocity of water | |
| 203. |
Velocity of flow of water in plain sedimentation water tank, is normally kept |
| A. | 3 cm/minute |
| B. | 10 cm/minute |
| C. | 20 cm/minute |
| D. | 30 cm/minute |
| Answer» D. 30 cm/minute | |
| 204. |
The depth of the water table at a place is 45 m below the general ground level. To lift water from a deep tube well in such a locality, the type of pump to be installed is |
| A. | Centrifugal pump |
| B. | Reciprocating pump |
| C. | Deep well turbine pump |
| D. | None of these |
| Answer» C. Deep well turbine pump | |
| 205. |
In a well planned city, the layout of distribution pipes generally adopted, is |
| A. | Grid-iron system |
| B. | Interlaced system |
| C. | Reticulation system |
| D. | All the above |
| Answer» D. All the above | |
| 206. |
Pick up the incorrect statement from the following: |
| A. | Free surface ground water is subjected to atmospheric pressure |
| B. | Water table surface rises and falls with seasons |
| C. | Depth of water table is directly proportional to the rate of drawl of water |
| D. | Level of water table remains stationary |
| Answer» D. Level of water table remains stationary | |
| 207. |
Pick up the incorrect statement from the following: |
| A. | The flow in strainer type wells is radial (B) (C) (D) |
| B. | The flow in cavity type wells in spherical |
| C. | In strainer type wells, area of flow depends upon the length of the strainer pipe |
| D. | In cavity type wells, area of flow depends upon the size of the cavity |
| Answer» C. In strainer type wells, area of flow depends upon the length of the strainer pipe | |
| 208. |
As per IS : 1172-1963, water required per head per day for average domestic purposes, is |
| A. | 50 litres |
| B. | 65 litres |
| C. | 85 litres |
| D. | 135 litres |
| Answer» D. 135 litres | |
| 209. |
The duration of contact of chlorine with water before it is served to the first consumer, should be at least |
| A. | 10 to 15 minutes |
| B. | 15 to 20 minutes |
| C. | 20 to 30 minutes |
| D. | 30 to 40 minutes |
| Answer» C. 20 to 30 minutes | |
| 210. |
Water supply system includes |
| A. | Digging a well for water |
| B. | Construction of dams |
| C. | Construction of canals |
| D. | Entire arrangement from source to distribution |
| Answer» D. Entire arrangement from source to distribution | |
| 211. |
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» A. Working pressure | |
| 212. |
For the same draw down in two observations wells at distances r1 and r2, the times after start of pumping are t1 and t2 hours respectively. The relation which holds good is |
| A. | t2 = r2/r1 × t1 |
| B. | t2 = (r2/r1)² × t1 |
| C. | t2 = (r2/r1)3× t1 |
| D. | t2 = (r2/r1) × t12 |
| Answer» B. t2 = (r2/r1)² × t1 | |
| 213. |
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» D. 70 cm to 120 cm | |
| 214. |
The intake opening is generally covered by a screen to prevent entry of debris etc. and its level is kept |
| A. | At the level of water of the source |
| B. | At the bottom of water of the source |
| C. | At about 2.5 m above the bottom |
| D. | None of these |
| Answer» C. At about 2.5 m above the bottom | |
| 215. |
If four fires break out in a city of population 40 lakhs and if each hydrant has three streams and duration of each fire is four hours, the total quantity of water required, is |
| A. | 1880 kilo litres |
| B. | 2880 kilo litres |
| C. | 3880 kilo litres |
| D. | 4880 kilo litres |
| Answer» B. 2880 kilo litres | |
| 216. |
Steel pipe are |
| A. | Suitable for withstanding high internal pressure |
| B. | Connected by riveted or welded joints |
| C. | Generally laid underground and no expansion joint is required |
| D. | Likely to last 100 years under ordinary conditions |
| Answer» D. Likely to last 100 years under ordinary conditions | |
| 217. |
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» A. Elevated tank | |
| 218. |
The force which develops in a pressure conduit supported on trestles, is |
| A. | Tension |
| B. | Compression |
| C. | Temperature stress |
| D. | Flexural stress |
| Answer» D. Flexural stress | |
| 219. |
Standard unit of turbidity of water is in one litre of distilled water, one milligram of finely divided |
| A. | Silica |
| B. | Mud |
| C. | Clay |
| D. | Organic matter |
| Answer» A. Silica | |
| 220. |
For complete stabilisation of organic matter in polluted water, it takes |
| A. | 5 days |
| B. | 10 days |
| C. | 20 days |
| D. | 30 days |
| Answer» D. 30 days | |
| 221. |
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 × 102× API (B) (C) (D) |
| B. | Q = 2.758 × 102× API |
| C. | Q = 2.758 × 103× API |
| D. | Q = 2.758 × 103× A/PI |
| Answer» C. Q = 2.758 × 103× API | |
| 222. |
Shales are |
| A. | Porous |
| B. | Permeable |
| C. | Porous and permeable |
| D. | Porous but not permeable |
| Answer» D. Porous but not permeable | |
| 223. |
The best process of disinfection of public water supply, is by |
| A. | Boiling |
| B. | Chlorination |
| C. | Adding lime |
| D. | Adding ozone |
| Answer» B. Chlorination | |
| 224. |
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» A. 3 | |
| 225. |
Surge tanks are used |
| A. | For storage water |
| B. | To increase the velocity in a pipeline |
| C. | As overflow valves |
| D. | To guard against water hammer |
| Answer» D. To guard against water hammer | |
| 226. |
Normal values of overflow rate for plain sedimentation tanks in litres/hr/m2, generally range between |
| A. | 100 to 250 |
| B. | 250 to 500 |
| C. | 500 to 750 |
| D. | 750 to 1000 |
| Answer» C. 500 to 750 | |
| 227. |
P.V.C. pipes can withstand pressure bead of water upto |
| A. | 25 m |
| B. | 50 m |
| C. | 75 m |
| D. | 100 m |
| Answer» D. 100 m | |
| 228. |
Most commonly used pump for lifting water in water supply mains, is |
| A. | Axial flow pump |
| B. | Reciprocating pump |
| C. | Rotary type pump |
| D. | Centrifugal pumps |
| Answer» A. Axial flow pump | |
| 229. |
The fire demand for a city of 50,000 populations, according to Godrich formula, is |
| A. | 40 mld |
| B. | 42 mld |
| C. | 44 mld |
| D. | 48 mld |
| Answer» C. 44 mld | |
| 230. |
If V is total consumption of water in litres for a population of N individuals, per capita consumption or water allowance for the water supply Q, is given by |
| A. | Q = V/12N |
| B. | Q = V/24N |
| C. | Q = V/265N |
| D. | None of these |
| Answer» C. Q = V/265N | |
| 231. |
For controlling algae, the most commonly used chemical, is |
| A. | Copper sulphate |
| B. | Alum |
| C. | Lime |
| D. | Bleaching powder |
| Answer» A. Copper sulphate | |
| 232. |
The storage capacity of a reservoir may be divided into three zones. The lowest zone is |
| A. | Dead storage |
| B. | Useful storage |
| C. | Surcharge storage |
| D. | None of these |
| Answer» A. Dead storage | |
| 233. |
Economic height of a dam is the height corresponding to which |
| A. | Cost of the dam per unit of storage is minimum |
| B. | Amount of silting is less |
| C. | Cost of dam per unit storage is maximum |
| D. | Free board provided is least |
| Answer» A. Cost of the dam per unit of storage is minimum | |
| 234. |
For maximum alkalinity of water, pH value should be |
| A. | Zero |
| B. | Less than 7 |
| C. | More than 7 |
| D. | 14 |
| Answer» D. 14 | |
| 235. |
The efficiency of a pumping set, is generally assumed |
| A. | 50 % |
| B. | 55 % |
| C. | 60 % |
| D. | 65 % |
| Answer» D. 65 % | |
| 236. |
The population growth curve is |
| A. | S-shaped curve |
| B. | Parabolic curve |
| C. | Circular curve |
| D. | Straight line |
| Answer» A. S-shaped curve | |
| 237. |
The fire demand for ascertaining the empirical formula 1136.5 [(P/10) + 10] known as |
| A. | Kuichling's formula |
| B. | Buston's formula |
| C. | Freeman formula |
| D. | Under Writers formula |
| Answer» C. Freeman formula | |
| 238. |
The bacterias which may survive with or without free oxygen, are called |
| A. | Aerobic bacterias |
| B. | Anaerobic bacterias |
| C. | Facultative bacteria's |
| D. | None of these |
| Answer» C. Facultative bacteria's | |
| 239. |
Aeration of water is done to remove |
| A. | Odour |
| B. | Colour |
| C. | Bacterias |
| D. | Turbidity |
| Answer» A. Odour | |
| 240. |
The maximum pressure to which cast iron pipes may be subjected to, is |
| A. | 3 kg/cm2 |
| B. | 5 kg/cm2 |
| C. | 7 kg/cm2 |
| D. | 10 kg/cm2 |
| Answer» C. 7 kg/cm2 | |
| 241. |
Water may not contain much impurity if its source is |
| A. | Reservoirs |
| B. | Stream flowing in plains |
| C. | Lakes in lower regions |
| D. | Spring along hill slopes |
| Answer» D. Spring along hill slopes | |
| 242. |
If p is total internal pressure, d is diameter of pressure conduit and t is thickness of conduit, the Hoop's stress is |
| A. | 𝜋𝑑𝑝/𝑡 |
| B. | 𝜋𝑑𝑝/2𝑡 |
| C. | dp/2t |
| D. | dt/2p |
| Answer» C. dp/2t | |
| 243. |
Turbidity of water is expressed |
| A. | In ppm |
| B. | In numbers in an arbitrary scale |
| C. | By pH value |
| D. | By colour code |
| Answer» A. In ppm | |
| 244. |
In plain sedimentation tanks under normal conditions, impurities are removed upto |
| A. | 60 % |
| B. | 70 % |
| C. | 80 % |
| D. | 90 % |
| Answer» B. 70 % | |
| 245. |
In slow sand filters, the turbidity of raw water can be removed only up to |
| A. | 60 mg/litre |
| B. | 75 mg/litre |
| C. | 100 gm/litre |
| D. | 150 mg/litre |
| Answer» A. 60 mg/litre | |
| 246. |
Pressure relief valves are provided in water mains |
| A. | To reduce the pressure |
| B. | At low points |
| C. | Upstream of sluice |
| D. | All the above |
| Answer» D. All the above | |
| 247. |
Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be |
| A. | Nil |
| B. | 5 |
| C. | 10 |
| D. | 15 |
| Answer» A. Nil | |
| 248. |
At break point of chlorination, |
| A. | Chlorine is used to oxidise |
| B. | Residual chloride is zero |
| C. | Residual chloride is maximum |
| D. | Residual chlorine reappears |
| Answer» D. Residual chlorine reappears | |
| 249. |
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» B. Permeability | |
| 250. |
By boiling water, hardness can be removed if it is due to |
| A. | Calcium sulphate |
| B. | Magnesium sulphate |
| C. | Calcium nitrate |
| D. | Calcium bicarbonate |
| Answer» D. Calcium bicarbonate | |
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