1. Specific yield of well is
a) Discharge per unit time
b) Yield of well per metre of draw down*
c) Velocity of water per unit time
d)None of the above
Answer - b) Yield of well per metre of drawdown*
2.While taking sample of water from well, sample is collected
a)About 2 metre above the bottom of wel
b) About 1 metre above the bottom of well *
c)About 1 metres below the bottom of well
d) none of the above
Answer -b) About 1 metre above the bottom of well *
3. While collecting sample of water from tap the
a) Mouth of tap is heated for 5 minutes*
b) Mouth of tap is heated for 10 minutes
c)Mouth of tap is not heated
d)none of the above
Answer -a) Mouth of tap is heated for 5 minutes*
4. Demand of water for passengers on railway station is
a)10 litres per passenger
b)15 litres per passenger
c) 20 litres for passenger
d) 25 litres per passenger*
Answer -d) 25 litres per passenger*
5. Peak hour demand of water is taken as ---------- times the average daily demand
a)1.5
b)1.9
c)2.25*
d)2.75
Answer - c)2.25*
6. The spacing of tube wells should generally be more than ----------from the circle of influence
a)10 metre
b)50 metre
c)100 metre*
d) 500 metre
Answer -c)100 metre*
7. The capacity of highest storage tank with efficient standby pump should be higher of the following figures
a)1/4 the maximum water consumption in 24 hours
b)1/3 the normal water consumption in 24 hours
c)1/4 the normal water consumption in 24 hours.
d) a or b*
e) b or c
f) a of c
Answer -d) a or b*
8. With regard to standard of quality of drinking water as laid down by Indian Railway , the requirement (desirable) limit of total dissolved solids should not be more than---------- mg/l
a)200
b) 300
c) 400
d) 500*
Answer -d) 500*
9. Chandigarh is a city which has roads generally parallel or perpendicular to each other. The ideal water supply system in such a city should be
a.Dead and system
b.Grid Iron system*
c.Ring system
d.Any of them
Answer -b.Grid Iron system*
10. Give the most matching option out of list one and list to with regard to pipe appurtenances of fittings
Llist I type of fitting) List -II(Function of the fitting)
A) Sluice Valves or gate Valves 1. We are provided to stop and regulate the flow of water in course of ordinary and emergency operations
B) Scour Valve 2. These are automatic cut off valves. when pressure of water exceeds specific limit the wall operates
automatically and saves a particular section of pipe before bursting takes place
C) Air Valve 3. These are located at dead end and the lowest points or depressions in the to remove sand or silt deposited in the water pipe
D) Relief Valve 4. Whenever there are distinct high points in the gradient of the pipeline. They are installed to permit
expulsion of airMatching option A B C D
(a ) 1 2 3 4
(b) 1 3 4 2*
(c) 2 4 1 3
(d) 4 3 2 1
Answer -(b) 1 3 4 2*
11. From distribution main of 40 mm size , number of service pipe of 15 mm size can be taken off are---------
a) 3
b) 6
c) 10
d) 12*
Answer -d) 12*
12. From the distribution main of 40 mm size, number of service pipe of 20 mm size can be taken off are -------
a)3
B) 6*
c) 10
d) 12
Answer - B) 6*
13. From distribution main of 50 mm size, number of service pipes of 15 mm size can be taken off are ------
a) 6
b)10
c) 12
e):20*
Answer -e):20*
14. PH value of drinking water as per wh0 standards should lie between
a)5 and 5.5
b)6 and 7
c) 7 and 7.5
d)7 and 8.5*
Answer -d)7 and 8.5*
12. The amount of residual chlorine after a period of contact 10 to 20 minutes is
a.0.1 to 0.2 ppm.*
b.0.2 to 0.3 ppm.
c.0.3 to 0.4 ppm
d.0.4 to 0.5ppm
Answer - a.0.1 to 0.2 ppm.*
13. A rural water supply serves a population of 10, 000 at the rate of 50 litres per capita per day . For the chlorine dose of 2 PPM the required amount of bleaching powder with 20% available chlorine will be
a.0.5 kg
b.5 kg *
c.10 kg
d.15 kg
Answer -b.5 kg *
14. The main drawback 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 metre
e) all of the above*
Answer - e) all of the above*
15.Aeration Of water is done to remove
a) Odour*
b) Colour
c) Bacterias
d) Hardness
e) Turbidity
Answer - a) Odour*
16. Requirement of water for platform washing is
a)5 litre per square metre per day *
b)10 litre per square meter per day
c) 15 litre per square metre per day
d)20 litre per square metre per day
Answer -a)5 litre per square metre per day *
17. Requirement of water for apron washing
a.5 litre per square metre per day
b.10 litre per square metre per day *
c.15 litre per square metre per day
d.20 litre per square metre per day
Answer -b.10 litre per square metre per day *
18. The pumping system should be capable of supplying the normal quantity of water required in 24 hours in
a)12 hours or less
b) 16 hours or less
c) 20 hours or less*
d) 8 hours or less
Answer -c) 20 hours or less*
19. Water connection given to contractor for construction work can be discontinued by giving a notice of
a)3 days*
b) 2 days
c)7 days
d) no notice is required
Answer -a)3 days*
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