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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.
| 4401. |
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 |
| E. | all the above. |
| Answer» F. | |
| 4402. |
The maximum permissible colour for domestic supplies based on cobalt scale, is |
| A. | 5 ppm |
| B. | 10 ppm |
| C. | 15 ppm |
| D. | 20 ppm |
| E. | 25 ppm. |
| Answer» E. 25 ppm. | |
| 4403. |
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. | |
| 4404. |
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. |
| E. | 25 P.P.M. |
| Answer» E. 25 P.P.M. | |
| 4405. |
The joint used for joining the plain ends of cast iron pipes, is |
| A. | flanged joint |
| B. | socket and spigot joint . |
| C. | dresser coupling joint |
| D. | flexible joint |
| E. | expansion joint. |
| Answer» D. flexible joint | |
| 4406. |
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. | |
| 4407. |
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 |
| E. | 12 to 16 hours. |
| Answer» C. 6 to 10 hours | |
| 4408. |
Growth of population can be conveniently represented by |
| A. | an arithmetical curve |
| B. | a semi-logarithmic curve |
| C. | a logistic curve |
| D. | a straight line curve |
| E. | all the above. |
| Answer» D. a straight line curve | |
| 4409. |
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» E. | |
| 4410. |
Air valves are generally provided in pressure pipes of water supply |
| A. | at pipe junctions |
| B. | at summits |
| C. | at low points |
| D. | near service pipes. |
| Answer» C. at low points | |
| 4411. |
Bacterias which can survive with or without free oxygen, are known |
| A. | aerobic bacterias |
| B. | anerobic bacterias |
| C. | facultative bacterias |
| D. | none of these. |
| Answer» D. none of these. | |
| 4412. |
The type of joint generally used in cast iron pipes, is |
| A. | socket and spigot joint |
| B. | flanged joint |
| C. | dresser coupling joint |
| D. | flexible joint |
| E. | all the above. |
| Answer» F. | |
| 4413. |
Asbestos pipes are joined by means of |
| A. | flanged joint |
| B. | flexible joint |
| C. | dresser coupling joint |
| D. | simplex joint |
| E. | socket and spigot joint. |
| Answer» E. socket and spigot joint. | |
| 4414. |
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. | |
| 4415. |
Chlorination of water does not remove |
| A. | ammonia content |
| B. | B.O.D. |
| C. | organic matter content |
| D. | dissolved oxygen. |
| Answer» E. | |
| 4416. |
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 |
| E. | 40 cm/minute. |
| Answer» E. 40 cm/minute. | |
| 4417. |
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 | |
| 4418. |
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. |
| E. | 250 P.P.M. |
| Answer» F. | |
| 4419. |
Water may contain |
| A. | bicarbonate alkalinity |
| B. | carbonate alkalinity |
| C. | hydroxide alkalinity |
| D. | caustic alkalinity |
| E. | all the above. |
| Answer» F. | |
| 4420. |
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» D. none of these. | |
| 4421. |
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 | |
| 4422. |
The maximum permissible hardness for public supplies is |
| A. | 95 mg/litre |
| B. | 105 mg/litre |
| C. | 115 mg/litre |
| D. | 125 mg/litre |
| E. | 150 mg/litre. |
| Answer» D. 125 mg/litre | |
| 4423. |
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 | |
| 4424. |
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 | |
| 4425. |
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 |
| E. | 150 litres. |
| Answer» E. 150 litres. | |
| 4426. |
For controlling algae, the most commonly used chemical, is |
| A. | copper sulphate |
| B. | alum |
| C. | lime |
| D. | bleaching powder. |
| Answer» B. alum | |
| 4427. |
According to Godrich the ratio of peak demand rate to mean demand is |
| A. | <img src="/_files/images/civil-engineering/water-supply-engineering/203-10.20-1.png"> |
| B. | <img src="/_files/images/civil-engineering/water-supply-engineering/203-10.20-2.png"> |
| C. | <img src="/_files/images/civil-engineering/water-supply-engineering/203-10.20-3.png"> |
| D. | <img src="/_files/images/civil-engineering/water-supply-engineering/203-10.20-4.png"> |
| E. | All the above. |
| Answer» F. | |
| 4428. |
The head against which the motor works for lifting water, is |
| A. | maximum depth of water table below ground level |
| B. | maximum depression head |
| C. | velocity head |
| D. | frictional losses in the delivery pipe |
| E. | all the above. |
| Answer» F. | |
| 4429. |
Plain chlorination is used for water |
| A. | with turbidities less than 20 mg/litre |
| B. | obtained from clear lakes |
| C. | consumed during emergencies |
| D. | supplies to armies during war |
| E. | all the above. |
| Answer» F. | |
| 4430. |
Underground water is obtained from |
| A. | rains |
| B. | rivers |
| C. | lakes |
| D. | reservoirs |
| E. | springs. |
| Answer» F. | |
| 4431. |
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» E. | |
| 4432. |
Higher yield may be expected from |
| A. | gravity springs |
| B. | surface springs |
| C. | artesian springs |
| D. | all the above. |
| Answer» D. all the above. | |
| 4433. |
An ideal sand for filters should be |
| A. | free from dirt and other impurities |
| B. | uniform in nature and size |
| C. | hard and resistant |
| D. | all the above. |
| Answer» E. | |
| 4434. |
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 | |
| 4435. |
From the surface of reservoir, evaporation may be minimised by sprinkling |
| A. | Spirit |
| B. | Hydrochloric acid |
| C. | Cetyl alcohol |
| D. | Methane |
| E. | None of these. |
| Answer» D. Methane | |
| 4436. |
Gravity conduits are generally in the form of |
| A. | canals |
| B. | flumes |
| C. | aqueduct |
| D. | tunnels |
| E. | all the above. |
| Answer» F. | |
| 4437. |
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 |
| E. | 150 cm. |
| Answer» E. 150 cm. | |
| 4438. |
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 |
| E. | violet. |
| Answer» B. greenish | |
| 4439. |
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. | <img src="/_files/images/civil-engineering/water-supply-engineering/208-10.82-1.png"> |
| B. | <img src="/_files/images/civil-engineering/water-supply-engineering/208-10.82-2.png"> |
| C. | <img src="/_files/images/civil-engineering/water-supply-engineering/208-10.82-3.png"> |
| D. | <img src="/_files/images/civil-engineering/water-supply-engineering/208-10.82-4.png"> |
| E. | none of these. |
| Answer» C. <img src="/_files/images/civil-engineering/water-supply-engineering/208-10.82-3.png"> | |
| 4440. |
The valve fitted closely in a recess against an opening in a pipe, is generally |
| A. | wedge shaped circular disc |
| B. | spherical disc |
| C. | parallelopiped disc |
| D. | conical shaped circular disc. |
| Answer» B. spherical disc | |
| 4441. |
S1 and S2 are the draw downs in an observation well at times t1 and t2 after pumping. For discharge Q and coefficient of transmissibility T, the relationship, is |
| A. | <img src="/_files/images/civil-engineering/water-supply-engineering/208-10.81-1.png"> |
| B. | <img src="/_files/images/civil-engineering/water-supply-engineering/208-10.81-2.png"> |
| C. | <img src="/_files/images/civil-engineering/water-supply-engineering/208-10.81-3.png"> |
| D. | <img src="/_files/images/civil-engineering/water-supply-engineering/208-10.81-4.png"> |
| Answer» C. <img src="/_files/images/civil-engineering/water-supply-engineering/208-10.81-3.png"> | |
| 4442. |
For least effect on the water table, the tube wells must be dug one in every |
| A. | 0.5 sq km |
| B. | 0.75 sq km |
| C. | 1.0 sq km |
| D. | 1.25 sq km |
| E. | 1.5 sq km. |
| Answer» F. | |
| 4443. |
In plain sedimentation tanks under normal conditions, impurities are removed upto |
| A. | 60% |
| B. | 70% |
| C. | 80% |
| D. | 90%. |
| Answer» C. 80% | |
| 4444. |
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 | |
| 4445. |
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 |
| E. | none of these. |
| Answer» B. weir or spillway method | |
| 4446. |
Alkalinity in water may be caused due to |
| A. | calcium and magnesium bicarbonates |
| B. | sodium carbonate |
| C. | potassium carbonate |
| D. | calcium hydroxide |
| E. | all the above. |
| Answer» F. | |
| 4447. |
Open channels supported over tres-les, are generally known as |
| A. | raised canals |
| B. | acqueducts |
| C. | syphons |
| D. | flumes. |
| Answer» E. | |
| 4448. |
Air inlet valve in water mains, is generally provided at |
| A. | summit of the pipe |
| B. | upstream of sluice valve |
| C. | down stream of sluice valve |
| D. | valley of the pipe |
| E. | both (a) and (c) of above. |
| Answer» F. | |
| 4449. |
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 |
| E. | one hour. |
| Answer» D. 30 to 40 minutes | |
| 4450. |
Rapid sand filter |
| A. | should be preceeded by coagulation and sedimentation |
| B. | uses rapid sand as filter media |
| C. | is used after slow sand filtering has been done |
| D. | can combine disinfection also. |
| Answer» B. uses rapid sand as filter media | |