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MCQOPTIONS
This section includes 5814 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 4201. |
Pick up the correct statement from the following regarding radial flow centrifugal pumps : |
| A. | These are provided with volute type or turbine type casings |
| B. | In involute type of radial flow centrifugal pump, the impeller discharges into a gradually expanding spiral casing |
| C. | In turbine type of radial flow centrifugal pumps, the impeller is surrounded by stationary guide vanes to reduce the velocity of water |
| D. | The efficiency of turbine type of radial flow centrifugal pump, is always higher than that of volute type |
| E. | All the above. |
| Answer» F. | |
| 4202. |
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 |
| E. | all the above. |
| Answer» F. | |
| 4203. |
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 |
| E. | all the above. |
| Answer» F. | |
| 4204. |
An area is declared drought affected if its mean rainfall is less than |
| A. | 50% |
| B. | 60% |
| C. | 75% |
| D. | 80% |
| E. | 85%. |
| Answer» F. | |
| 4205. |
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. | 5% |
| B. | 8% |
| C. | 10% |
| D. | 12% |
| E. | 15%. |
| Answer» B. 8% | |
| 4206. |
If discharge of a pump is 0.16 cumecs, the economic diameter of pipe, is |
| A. | 0.488 m |
| B. | 4.88 cm |
| C. | 0.488 cm |
| D. | 4.88 m |
| E. | none of these. |
| Answer» B. 4.88 cm | |
| 4207. |
Gravity conduits for carrying water from the source are |
| A. | canals |
| B. | flumes |
| C. | acqueducts |
| D. | all the above. |
| Answer» E. | |
| 4208. |
Continuous flow of water can be expected from |
| A. | gravity springs |
| B. | surface springs |
| C. | artesian springs |
| D. | none of these. |
| Answer» D. none of these. | |
| 4209. |
The maximum hourly consumption, is generally taken as |
| A. | 110% |
| B. | 120% |
| C. | 130% |
| D. | 140% |
| E. | 150%. |
| Answer» F. | |
| 4210. |
A city supply includes |
| A. | domestic water demand |
| B. | industrial and commercial water demands |
| C. | demand for public uses and fire |
| D. | water losses |
| E. | all the above. |
| Answer» F. | |
| 4211. |
If p is total internal pressure, d is diameter of pressure conduit and t is thickness of conduit, the Hoop's stress is |
| A. | <img src="/_files/images/civil-engineering/water-supply-engineering/210-10.108-1.png"> |
| B. | <img src="/_files/images/civil-engineering/water-supply-engineering/210-10.108-2.png"> |
| C. | <img src="/_files/images/civil-engineering/water-supply-engineering/210-10.108-3.png"> |
| D. | <img src="/_files/images/civil-engineering/water-supply-engineering/210-10.108-4.png"> |
| Answer» D. <img src="/_files/images/civil-engineering/water-supply-engineering/210-10.108-4.png"> | |
| 4212. |
The force which develops in a pressure conduit supported on trestles, is |
| A. | tension |
| B. | compression |
| C. | temperature stress |
| D. | flexural stress. |
| Answer» E. | |
| 4213. |
Surface water is obtained from |
| A. | well |
| B. | springs |
| C. | artesian well |
| D. | rain. |
| Answer» E. | |
| 4214. |
Hardness of water is caused due to |
| A. | calcium sulphate |
| B. | magnesium sulphate |
| C. | calcium nitrates |
| D. | calcium bicarbonates |
| E. | all the above. |
| Answer» F. | |
| 4215. |
The best process of disinfection of public water supply, is by |
| A. | boiling |
| B. | chlorination |
| C. | adding lime |
| D. | adding zone. |
| Answer» C. adding lime | |
| 4216. |
Mostly used coagulant, is |
| A. | chlorine |
| B. | alum |
| C. | lime |
| D. | bleaching powder. |
| Answer» C. lime | |
| 4217. |
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. | <img src="/_files/images/civil-engineering/water-supply-engineering/223-10.287-1.png"> |
| B. | <img src="/_files/images/civil-engineering/water-supply-engineering/223-10.287-2.png"> |
| C. | <img src="/_files/images/civil-engineering/water-supply-engineering/223-10.287-3.png"> |
| D. | <img src="/_files/images/civil-engineering/water-supply-engineering/223-10.287-4.png"> |
| E. | none of these. |
| Answer» B. <img src="/_files/images/civil-engineering/water-supply-engineering/223-10.287-2.png"> | |
| 4218. |
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 | |
| 4219. |
Rapid gravity filter can only remove turbidity of water upto |
| A. | 15 to 25 gm/litre |
| B. | 25 to 30 gm/litre |
| C. | 30 to 35 cm/litre |
| D. | 35 to 40 gm/litre |
| E. | 50 gm/litre. |
| Answer» E. 50 gm/litre. | |
| 4220. |
A pressure conduit laid under ground, 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 |
| E. | none of these. |
| Answer» D. longitudinal stresses due to unbalanced pressure to bends | |
| 4221. |
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 |
| E. | 48 hours. |
| Answer» E. 48 hours. | |
| 4222. |
The period of cleaning of a slow sand filter, is usually |
| A. | 5 to 10 days |
| B. | two weeks to three weeks |
| C. | one month to three months |
| D. | three months to six months |
| E. | one year. |
| Answer» D. three months to six months | |
| 4223. |
Percussion drilling is unsuitable in |
| A. | unconsolidated sand |
| B. | unconsolidated gravel |
| C. | quick sand |
| D. | consolidated rocks. |
| Answer» E. | |
| 4224. |
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 |
| E. | none of these. |
| Answer» E. none of these. | |
| 4225. |
Mathamoglobinemia, or blue baby disease is caused due to |
| A. | chlorides |
| B. | nitrites |
| C. | nitrates |
| D. | sulphides. |
| Answer» D. sulphides. | |
| 4226. |
The main process to purify water by filtration, is |
| A. | mechanical straining |
| B. | flocculation and sedimentation |
| C. | biological metabolism |
| D. | electronic change |
| E. | all the above. |
| Answer» F. | |
| 4227. |
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). | |
| 4228. |
If d is the diameter of the pipe, p is the total internal pressure, f is the permissible tensile stress and n is the effective of the joint, the thickness t of metal pipe, is |
| A. | <img src="/_files/images/civil-engineering/water-supply-engineering/221-10.253-1.png"> |
| B. | <img src="/_files/images/civil-engineering/water-supply-engineering/221-10.253-2.png"> |
| C. | <img src="/_files/images/civil-engineering/water-supply-engineering/221-10.253-3.png"> |
| D. | <img src="/_files/images/civil-engineering/water-supply-engineering/221-10.253-4.png"> |
| E. | none of these. |
| Answer» C. <img src="/_files/images/civil-engineering/water-supply-engineering/221-10.253-3.png"> | |
| 4229. |
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 | |
| 4230. |
During treatment of water, sedimentation is done |
| A. | before filtration |
| B. | after filtration |
| C. | simultaneously with filtration |
| D. | along with chlorination. |
| Answer» B. after filtration | |
| 4231. |
E. Coli bacterias die in water having pH greater than |
| A. | 5.5 |
| B. | 6.5 |
| C. | 7.5 |
| D. | 8.5 |
| E. | 9.5 |
| Answer» F. | |
| 4232. |
A water channel supported above the ground over trestles, is generally called |
| A. | flume |
| B. | canal |
| C. | adueduct |
| D. | tunnel |
| E. | all the above. |
| Answer» B. canal | |
| 4233. |
One degree of hardness of water means a content of salts of |
| A. | 10.25 mg/litre |
| B. | 12.25 mg/litre |
| C. | 14.25 mg/litre |
| D. | 16.25 mg/litre. |
| E. | 20 mg/litre. |
| Answer» D. 16.25 mg/litre. | |
| 4234. |
At the socket and spigot joint, |
| A. | enlarged end of the pipe is called socket |
| B. | normal end of the pipe is called spigot |
| C. | spigot is fitted into the socket |
| D. | molten lead is used for water proofing |
| E. | all the above. |
| Answer» F. | |
| 4235. |
The equation in which Q is yearly run off in cm, P is yearly total rainfall in cm, H is difference of R.L.s. of lowest and highest points and A is area of catchment in square metres, is known as |
| A. | English formula |
| B. | Khosla's formula |
| C. | Justin's formula |
| D. | Vermule's formula. |
| Answer» D. Vermule's formula. | |
| 4236. |
Corrosion of well pipes may not be reduced by |
| A. | reducing the draw down and the pumping rate |
| B. | reducing the flow velocity |
| C. | using thicker pipes |
| D. | using screens having larger area of openings |
| E. | none of these. |
| Answer» E. none of these. | |
| 4237. |
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 | |
| 4238. |
The stone ware sewers |
| A. | are used for carrying sewage and drainage from houses |
| B. | are manufactured from clays and shales |
| C. | after casting are dried and burnt at temperature 150 C, 700 C and 1200 C |
| D. | are generally provided with a water proof cover by vaporising sodium chloride |
| E. | all the above. |
| Answer» F. | |
| 4239. |
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. | |
| 4240. |
If the difference in elevation of an edge of the pavement 9 m wide and its crown is 15 cm, the camber of the pavement, is |
| A. | 1 in 60 |
| B. | 1 in 45 |
| C. | 1 in 30 |
| D. | 1 in 15 |
| E. | 1 in 7.5 |
| Answer» D. 1 in 15 | |
| 4241. |
In septic tanks, decomposition of organic bacteria, is done by |
| A. | anaerobic bacteria |
| B. | aerobic bacteria |
| C. | both types of bacterias |
| D. | none of these. |
| Answer» B. aerobic bacteria | |
| 4242. |
During putrifaction process of sewage the gas given off, is |
| A. | carbon dioxide |
| B. | hydrogen |
| C. | ammonia |
| D. | methane |
| E. | all the above. |
| Answer» F. | |
| 4243. |
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 | |
| 4244. |
The sewer which received discharge from two or more main sewers, is known as |
| A. | a trunk sewer |
| B. | an outfall sewer |
| C. | a main sewer |
| D. | an intercepting sewer. |
| Answer» B. an outfall sewer | |
| 4245. |
A well oxidized sewage contains nitrogen mainly as |
| A. | nitrates |
| B. | nitrites |
| C. | free ammonia |
| D. | none of these. |
| Answer» B. nitrites | |
| 4246. |
The most effective arrangement for diverting excess storm water into a natural drainage, is |
| A. | leaping weir |
| B. | overflow weir |
| C. | siphon spill way |
| D. | none of these. |
| Answer» D. none of these. | |
| 4247. |
Large diameter sewers subjected to external pressure alone, are reinforced |
| A. | near the inner surface of the pipe |
| B. | near the outer surface of the pipe |
| C. | both (a) and (b) |
| D. | with elliptical cage |
| E. | none of these. |
| Answer» E. none of these. | |
| 4248. |
A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of |
| A. | Carbondioxide gas |
| B. | Hydrogen sulphide gas |
| C. | Methane gas |
| D. | Petrol vapours. |
| Answer» D. Petrol vapours. | |
| 4249. |
The standard B.O.D. at 20&Deg;C, is taken for the consumption in |
| A. | one day |
| B. | 2 days |
| C. | 3 days |
| D. | 4 days |
| E. | 5 days. |
| Answer» F. | |
| 4250. |
The superimposed load transmitted to the pipe, is generally evaluated by Bousiness formula |
| A. | <img src="/_files/images/civil-engineering/water-supply-engineering/211-10.112-1.png"> |
| B. | <img src="/_files/images/civil-engineering/water-supply-engineering/211-10.112-2.png"> |
| C. | <img src="/_files/images/civil-engineering/water-supply-engineering/211-10.112-3.png"> |
| D. | <img src="/_files/images/civil-engineering/water-supply-engineering/211-10.112-4.png"> |
| Answer» C. <img src="/_files/images/civil-engineering/water-supply-engineering/211-10.112-3.png"> | |