1. Assertion A : The consumption of water increases with increase in the distribution pressure.
Reason R : Higher distribution pressure causes more loss and waste of water.
Select your answer according to the coding system given below
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true but R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.
Ans: a
2. The per capita consumption of a locality is affected by
i) climatic conditions
ii) quality of water
iii) distribution pressure
The correct answer is
a) only (i)
b) both (i) and (ii)
c) both (i) and (iii)
d) all (i), (ii) and (iii)
Ans: d
3. Which of the following causes a decrease in per capita consumption ?
a) use of metering system
b) good quality of water
c) better standard of living of the people
d) hotter climate
Ans:a
4. The hourly variation factor is usually taken as
a) 1.5
b) 1.8
c) 2.0
d) 2.7
Ans:a
5. If the average daily consumption of a city is 100,000 m3, the maximum daily con¬sumption on peak hourly demand will be
a) 100000m3
b) 150000m3
c) 180000m3
d) 270000 m3
Ans:d
6. The distribution mains are designed for
a) maximum daily demand
b) maximum hourly demand
c) average daily demand
d) maximum hourly demand on maximum day
Ans:d
7. As compared to geometrical increase method of forecasting population, arithmetical increase method gives
a) lesser value
b) higher value
c) same value
d) accurate value
Ans:a
8. The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is
a) 9500
b) 9800
c) 10100
d) 10920
Ans:d
9. The suitable method of forecasting population for a young and rapidly increasing city is
a) arithmetical increase method
b) geometrical increase method
c) incremental increase method
d) graphical method
Ans:b
10., The depression of water table in a well due to pumping will be maximum
a) at a distance R from the well
b) close to the well
c) at a distance R/2 from the well
d) none of the above
where R is the radius of influence
Ans:b
11. The devices which are installed for drawing water from the sources are called
a) aquifers
b) aquiclude
c) filters
d) intakes
Ans:d
12. Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)
a) N = y + R
b) y = N + R
c) R = N + y
d) R > (N + y)
Ans:a
13. The type of valve, which is provided on the suction pipe in a tube-well, is
a) air relief valve
b) reflux valve
c) pressure relief valve
d) sluice valve
Ans:b
14. The maximum discharge of a tube-well is about
a) 5 litres/sec
b) 50 litres/sec
c) 500 litres/sec
d) 1000 litres/see
Ans:b
15. As compared to shallow-wells, deep wells have
a) more depth
b) less depth
c) more discharge
d) less discharge
Ans:c
16. Ground water is usually free from
a) suspended impurities
b) dissolved impurities
c) both suspended and dissolved impurities
d) none of the above
Ans:a
17. The polluted water is one which
a) contains pathogenic bacteria
b) consists of undesirable substances rendering it unfit for drinking and domestic use
c) is safe and suitable for drinking and domestic use
d) is contaminated
Ans:b
18. Which of the following is not a water borne disease ?
a) dysentery
b) cholera
c) typhoid
d) maleria
Ans:d
19. The most common cause of acidity in water is
a) carbon dioxide
b) oxygen
c) hydrogen
d) nitrogen
Ans:a
20. The phenolic compounds in public water supply should not be more than
a) 0.1 ppm
b) 0.01 ppm
c) 0.001 ppm
d) 0.0001 ppm
Ans:c
21. The maximum permissible limit for flouride in drinking water is
a) 0.1 mg/litre
b) 1.5 mg/litre
c) 5 mg/litre
d) 10 mg/litre
Ans:b
22. Standard EDTA (ethylene diamine tetra acetic acid) solution is used to determine the
a) hardness in water
b) turbidity in water
c) dissolved oxygen in water
d) residual chlorine in water
Ans:a
23. If the coliform bacteria is present in a sample of water, then the coliform test to be conducted is
i) presumptive coliform test
ii) confirmed coliform test
iii) completed coliform test
The correct answer is
a) only (i)
b) both (i) and (ii)
c) both (i) and (iii)
d) all (i), (ii) and (iii)
Ans:d
24. Alkalinity in water is expressed as milli-grams per litre in terms of equivalent
a) calcium carbonate
b) magnesium carbonate
c) sodium carbonate
d) calcium hydroxide
Ans:a
25. Which of the following values of pH represents a stronger acid?
a) 2
b) 5
c) 7
d) 10
Ans:a