500 Best Irrigation Engineering MCQ
Q121). Rapid sand filter can remove turbidity from water upto an extent of
a).15 to 25 ppm
b).25 to 35
c).35 to 40
d).40 to 50
Correct Answer:
35 to 40
Explanation:
Q122). 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
Correct Answer:
They are more costly
Explanation:
Q123). Pressure filters are best suited for
a).Swimming pools
b).Railway stations
c).Individual industries
d).All of these
Correct Answer:
All of these
Explanation:
Q124). The process of killing pathogenic bacterias from water is called
a).Sedimentation
b).Filteration
c).Coagulation
d).Disinfection
Correct Answer:
Disinfection
Explanation:
Q125). The most commonly used disinfectant for drinking water throughout the world is
a).Alum
b).Nitrogen
c).Lime
d).Chlorine
Correct Answer:
Chlorine
Explanation:
Q126). The ideal method of disinfection of swimming pool water is by
a).Chlorination
b).Lime treatment
c).Ozonisation
d).Ultra violet rays
Correct Answer:
Ozonisation
Explanation:
Q127). The amount of residual chlorine in treated water is determined by the
a).Orthotolodine test
b).Iodometric test
c).Amperometric test
d).All of the above
Correct Answer:
All of the above
Explanation:
Q128). The time of contact for chlorination should be at least
a).5 minutes
b).20 minutes
c).1 hour
d).2 hours
Correct Answer:
20 minutes
Explanation: