Top 350+ Solved Public Health Engineering MCQ Questions Answer
Q. The activated sludge
a. contains fertilising constituents
b. indicates the degree of aeration
c. indicates high water content
d. all of these
Q. The most commonly used disinfectant for drinking water throughout the world is
a. alum
b. nitorgen
c. lime
d. chlorine
Q. In high rate activated sludge treatment, bacterias are removed from
a. 20 to 40%
b. 40 to 60%
c. 60 to 80%
d. 80 to 95%
Q. Pressure filters are not used for treating municipal water supplies, because
a. the rate of filteration is high
b. the overall plant capacity is small
c. they are inefficient in the removal of turbidity and bacterias
d. they are more costly
Q. The process of killing pathogenic bacterias from water is called
a. sedimentation
b. filteration
c. coagulation
d. disinfection
Q. Bacterias which cause disease are called
a. anaerobic bacteria
b. facultative bacterias
c. aerobic bacteria
d. none of these
Q. The permanent hardness in water is caused due to the salts like
a. chlorides
b. nitrates
c. sulphates
d. all of these
Q. The sodium carbonate in water
a. causes bad taste
b. softens the water
c. increases hardness of water
d. stops epidemic
Q. An artesian spring is formed
a. when an aquifer gets exposed in a valley against a vertical cut
b. due to continuous fault in a rock through which water under pressure comes out
c. when a porous strata gets enclosed between two impervious strata
d. none of the above
Q. Slow sand filter is efficient to remove the bacterias from the raw water to an extent of
a. 50%
b. 70%
c. 85%
d. 99%