WSSE, MODULE -1 a.

Arithmetical increase method

b. Geometric increase method
1. Which of the following practices causes reduction in c. Comparative graphical method
per capita water consumption? d. None of these
a. Good water quality 9. The design period for a water supply project is
b. Hotter climate generally taken as
c. Modern living a. Less than 10 years
d. Metering system b. 20-30 years
2. The multiplying factor, as applied to obtain the peak c. 50 years
hourly water demand, in relation to maximum daily d. More than 50 years
demand is 10. Domestic water demand of a town having lower
a. 1.5 income group population is
b. 1.8 a. 135 lpcd
c. 2.0 b. 200 lpcd
d. 2.7 c. 270 lpcd
3. The multiplying factor, as applied to obtain the d. 330 lpcd
maximum daily water demand, in relation to average 11. The suitable method of forecasting population for a
daily demand is young rapidly developing city is
a. 1.5 a. Arithmetical increase method
b. 1.8 b. Geometric increase method
c. 2.0 c. Comparative graphical method
d. 2.7 d. None of these
4. The multiplying factor, as applied to obtain the peak 12. According to Kuchling formula the quantity of water
hourly water demand, in relation to average daily required in liters for fire demand is given by
demand is a. Q-1135((P/5)+10)
a. 1.5 b. Q-2500 ((P/5)+10)
b. 1.8
c. Q-3182√
c. 2.0
d. Q-5003√
d. 2.7
13. Which source of water among the following is not a
5. The total water requirement of a city is generally
sub-surface source?
assessed on the basis of
a. Spring
a. Maximum hourly demand
b. Well
b. Maximum daily demand + fire demand
c. Storage reservoir
c. Average daily demand + fire demand
d. Infiltration gallery
d. Greater of (a) and (b)
14. The natural inflow of subsurface water at the surface
6. The distribution system in water supplies is designed
is termed as
on the basis of
a. Lake
a. Maximum hourly demand
b. Spring
b. Maximum daily demand + fire demand
c. Infiltration gallery
c. Average daily demand + fire demand
d. Tube well
d. Greater of (a) and (b)
15. An infiltration gallery is
7. As compared to geometrical increase method of
a. A tube well with horizontal arms
forecasting population, the arithmetical increase
b. A horizontal well under the ground surface
method gives
c. An artesian well
a. Lesser value
d. A shallow well
b. Higher value
16. A well consisting of RCC rings placed on a curb, sunk
c. Equal value
in the bed of river is called
d. May vary as it depends on population figures
a. Infiltration well
b. Jack well
8. The suitable method of forecasting population for an
c. Deep well
old developed large city is
d. Artesian well
17. Water from infiltration well is collected by pipes and d. Aluminium sulphate
led to sump from where it is pumped, this sump is e. All the above
called 25. As compared to shallow wells deep wells have
a. Underground sump a. More depth
b. Jack well b. Less depth
c. Artesian well c. More discharge
d. Infiltration gallery d. Less discharge
18. Select the correct relationship between porosity (N), 26. For public water supply the threshold number
specific yield (Y), specific retention (R) should be less than
a. N= Y+R a. 3
b. Y=N+R b. 4
c. R=N+Y c. 2
d. R>(N+Y) d. 6
19. The devices which are installed for drawing water 27. Which of the following is not a water borne disease?
from sources are called a. Dysentery
a. Aquifers b. Cholera
b. Aquicludes c. Typhoid
c. Filters d. Malaria
d. Intakes 28. The maximum permissible limit for fluoride in
20. Permeable underground layer of water bearing drinking water in mg/litre is
stratum capable of yielding water is known as a. 0.1
a. Aquitard b. 1.5
b. Aquiclude c. 5
c. Aquifer d. 10
d. Aquifuge 29. Standard EDTA is used to determine the
21. If the average daily consumption of a city is 100,000 a. Hardness in water
m3 , the maximum daily consumption on peak hourly b. Turbidity in water
demand in m3 will be c. Dissolved oxygen in water
a. 100000 d. Residual chlorine in water
b. 150000
c. 180000 30. The specific retention is least in case of
d. 270000 a. Clay
22. The population of a town in three consecutive years b. Sand
are 5000, 7000, 8400 respectively. The population of c. Silt
the town in the fourth consecutive year according to d. Coarse gravel
geometrical increase method is 31. The specific yield is least in case of
a. 9500 a. Clay
b. 9800 b. Sand
c. 10100 c. Silt
d. 10920 d. Coarse gravel
23. Biochemical Oxygen Demand (B.O.D.) of safe 32. Most satisfactory formula for an estimate of fire
drinking water must be demand Q for a city of population P in thousands for
a. Nil Indian conditions, is
b. 5 a. Q =1115 ( )
c. 10
b. Q = 1640 √ (1 - 0.01√ )
d. 15
c. Q = 3180 √
e. 20
d. none of these.
24. Acidity in water is caused due to
33. Turbidity of raw water is a measure of
a. Mineral acids
a. Suspended solids
b. Free CO2
b. Acidity of water
c. Iron sulphate
 c. B.O.D a. 35Mld
d. None of these b. 45Mld
34. Water supply includes c. 60Mld
a. collection, transportation and treatment of d. 70Mld
water 41. If the annual average daily demand of water is 270
b. distribution of water to consumers lpcd and population of the city is 2,00,000 then peak
c. provision of hydrants for fire fighting hourly demand will be
d. mains, sub-mains and branch lines of water a. 145.8Mld
supply b. 160.5 Mld
e. all the above. c. 170 Mld
35. By boiling water hardness can be removed if it is due d. 180 Mld
to 42. Assuming the arithmetical increase method,
a. Calcium sulphate population of the town in the year 1991 with the
b. Magnesium sulphate help of the following census record of the population
c. Calcium nitrate will be
d. Calcium bicarbonate year 1951 1961 1971
---------------------------------------------------------------- Population in 255 495 735
36. According to IS : 1172-1963, a minimum of 135 litres thousands
of water capita per day, is required for a. 840
a. Boarding schools b. 945
b. Nurses home and medical quarters c. 1015
c. hostels d. 1125
d. all the above. ------------------------------------------
37. The factor affecting per capita demand, is 1. The average yield of a tube well is about
a. size of the city a. 5 l/sec
b. climatic conditions b. 50 l/sec
c. pressure in water mains c. 500 l/sec
d. cost of water d. 1000 l/sec
e. all the above. 2. Ground water is usually free from
38. If four fires break out in a city of population 40 lakhs a. suspended impurities
and if each hydrant has three streams of discharge b. dissolved impurities
1000 l/min each and duration of each fire is four c. both suspended impurities and dissolved
hours, the total quantity of water required in impurities
kiloliters, is d. none of the above
a. 1880 3. If the coliform bacteria is present in a sample of
b. 2880 water, then the coliform test to be conducted is
c. 3880 i) Presumptive coliform test
d. 4880 ii) Confirmed coliform test
39. Calculate the diameter of the conveying pipe iii) Completed coliform test
required to supply water from a source which is 8 a. Only (i)
km away from the town at a rate of 200 lpcd b. Both (i) and (ii)
,elevation difference between source and supply is c. Both (i) and (iii)
10 m and friction in the pipe being 0.003. d. All (i), (ii) and (iii)
a. 0.4 m 4. Alkalinity in water is expressed as milligrams per litre
b. 0.6m in terms of equivalent
c. 0.3m a. Calcium carbonate
d. 0.2 m b. Magnesium carbonate
40. A water supply scheme has to be designed for a city c. Sodium carbonate
having population of 1,00,000. If annual average d. Calcium hydroxide
daily consumption of water is 250 lpcd then 5. Turbidity is measured on
maximum daily draft will be a. Standard silica scale
 b. Standard cobalt scale 14. Economical diameter of pumping mains lie in the
c. Standard platinum scale range of
0.5
d. Platinum cobalt scale a. 0.97 to 1.22 Q
0.5
6. On standard silica scale, the turbidity in drinking b. Q
water should be limited to c. Q
a. 10 ppm d. None of these
3
b. 20 ppm 15. For a water discharge of 0.26 m /sec to an overhead
c. 30 ppm tank of 60 m height in a pipe of 300 m and 30 cm
d. 50 ppm diameter calculate the head loss. (f=0.04)
7. The quantity of water available from an infiltration a. 27.6 m
gallery depends upon the b. 25.5 m
a. Size of gallery c. 2.55 m
b. Nature of soil d. 2.76 m
c. Yield of source 16. A pump has a discharge of 500 l/sec at a total head
d. All of these of 25m. The drive motor delivers power of 150 kW
8. The layers such as sand and gravel which allow the to the pump. Calculate the efficiency of motor and
water to pass through them are known as pump.
a. Pervious layers a. 66%
b. Aquifers b. 72%
c. Water bearing strata c. 82%
d. All of these d. 78%
9. The layers such as lime stone and sand stone which 17. A city has a population of 70,000. Water is to be
do not all the water to pass through them is known drawn for domestic purpose from a bell mouth
as intake from a canal which runs for 10 hours a day
a. Aquifers with a flow depth of 1.5 m. if the average
b. Aquiclude consumption is 150 lpcd then the intake load in
c. Aquifuge m3/sec is
d. None of these a. 0.3
10. High turbidity of water can be determined by b. 0.29
a. Turbidity tube c. 0.27
b. Jacksons turbid meter d. 0.25
c. Baylis turbid meter 18. If the population of a city is 1 lakh, average water
d. Hellipe turbid meter consumption is 250 lpcd. , fire demand is 61 Mld.
11. Low turbidity of water can be determined by Then the capacity of distribution system should be
a. Turbidity tube a. 5 Mld
b. Jacksons turbid meter b. 67.5 Mld
c. Baylis turbid meter c. 106 Mld
d. Hellipe turbid meter d. None of these
12. The pH value of water for public supplies is limited 19. The census records of a city shows population as
from follows
a. 2.5 to 6.5
b. 6.5 to 8 present 50,000
c. 8 to 10.5 Before one decade 47100
d. 10.5 to 15 Before two decades 43500
13. A water having pH value 9 will have hydrogen ion Before three decades 41000
concentration in terms of moles/liter equal to
a. 103 Workout the probable population after one decade
b. 10-3 using incremental increase method.
c. 10
9 a. 53200
d. 10
-9 b. 56600
c. 60200
 d. None of these 6. If diameter of the main pipe is taken less than
20. Population statistics pertaining to a town are given economic diameter, then
below. Find population in 2010 by decreasing growth a. Head loss will be high
rate method. b. Cost of pipe will be less
Year 1970 1980 1990 2000 c. Both (a) and (b)
Population 55.5 63.7 71.3 79.5 d. None of these
in 1000 7. A pump has a discharge of 500 l/sec at a total head
a. 87343 of 25 m. The BHP of motor is 200. Calculate the
b. 94531 efficiency of pump.
c. 109563 a. 66%
d. None of these b. 72%
21. Determine the ground water velocity from the c. 82%
following data using Slichter formula. d. 78%
Slichter’s constant = 400 8. A small town of 80,000 persons is to be supplied
Effective size of particles in the aquifer = 0.15 mm water through the canal intake. The average daily
Hydraulic gradient = 1 in 100 consumption of water is 150 lpcd. The canal runs for
o
Coefficient of viscosity at 15 C = 1 12 hours a day with a flow depth of 1.5 m. calculate
a. 0.09 m/day the intake load in l/sec.
b. 0.1 m/day a. 278
c. 0.06 m/day b. 300
d. 0.25 m/day c. 250
__________________________ d. None of these
1. Maximum permissible total solid content in water 9. The population of new city is 18.5 million and is
for domestic purposes should not exceed growing at 20 % annually. How many years would it
a. 300 ppm take to double at the growth rate?
b. 400 ppm a. 3 – 4 years
c. 500 ppm b. 4 – 5 years
d. 1000 ppm c. 5 – 6 years
2. Maximum permissible chloride content in water for d. 6 – 7 years
domestic supplies should not exceed 10. If the population of a city is 1 lakh, average water
a. 250 ppm consumption is 250 lpcd. Then the filters and lift
b. 350 ppm pumps should be designed for
c. 450 ppm a. 45 Mld
d. 550 ppm b. 50 Mld
3. Dug wells are preferred when they are to be used for c. 25 Mld
a depth of d. 67.5 Mld
a. 10 m 11. The census records of a city shows population as
b. 20 m follows
c. 50 m present 50,000
d. 100 m Before one decade 47100
4. The most widely used tube well in India is Before two decades 43500
a. Strainer well Before three decades 41000
b. Cavity well Workout the probable population after two decades
c. Slotted well using arithmetical mean method.
d. Perforated well a. 53000
5. To determine the velocity of flow of ground water , b. 56000
the most commonly used non empirical formula is c. 59000
a. Darcy’s formula d. None of these
b. Slichter’s formula 12. The census records of a city shows population as
c. Hazen’s formula follows
d. Lacy’s formula present 50,000
 Before one decade 47100
Before two decades 43500
Before three decades 41000 1. For a discharge of 0.26 m3/sec to a total head of 88
Workout the probable population after one decade m, calculate BHP of pump if combined efficiency is
using geometrical mean method. 57%.
a. 53500
b. 57245 2. For a water sample the total alkalinity is 200 mg/l as
c. 61252 CaCO3. The Ca++ is 120 mg/ l and Mg++ is 60 mg/l.
d. None of these What is total hardness?
13. If the average water consumption of a city is 300 a. 550 mg/l
lpcd and its population is 4,00,000. The maximum b. 650 mg/l
hourly draft of maximum day and maximum daily c. 450mg/l
draft is equal to d. None of these
a. 120 Mld and 260 Mld
b. 1210 Mld and 324 Mld Dear students, these are the possible short answer questions I
c. 324 Mld and 216 Mld have gathered to the best of my knowledge. Questions are
d. None of these from module 1 only. You can practice out of your own
14. Most impure source of water is interest.
a. Pond
Thank you
b. Streams
c. Rivers Debjani Panda
d. Reservoir
15. Which one of the following would contain water
with maximum turbidity.
a. Lake
b. Ocean
c. River
d. Well
16. Excess ______ causes discoloration of teeth.
a. Fluoride
b. Chloride
c. Phenol
d. All of these
17. Aerobic bacteria survive in _____.
a. Presence of oxygen
b. Absence of oxygen
c. Both presence and absence of oxygen
d. None of these
18. Anaerobic bacteria survive in _____.
a. Presence of oxygen
b. Absence of oxygen
c. Both presence and absence of oxygen
d. None of these
19. Facultative bacteria survive in _____.
a. Presence of oxygen
b. Absence of oxygen
c. Both presence and absence of oxygen
d. None of these
20. Using Lea’s formula, calculate the economic
diameter of the rising mains if discharge is 0.25
m3/sec.