Environmental Engineering Multiple choice Questions and Answers pdf

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 impuri¬ties
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
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