500 Best Irrigation Engineering MCQ
Q137). The amount of chlorine used for plain chlorination of water is about
a).0.2 ppm
b).0.3 ppm
c).0.4 ppm
d).0.5 ppm
Correct Answer:
0.5 ppm
Explanation:
Q138). The most commonly used chemical for dechlorination of water is
a).Sodium thiosulphate
b).Sodium sulphite
c).Potassium permanganate
d).All of these
Correct Answer:
All of these
Explanation:
Q139). In orthotolodine test, sage residual for drinking water is indicated by
a).Yellow colour
b).Green colour
c).Lemon yellow colour
d).None of these
Correct Answer:
Yellow colour
Explanation:
Q140). Bleaching powder is
a).Slaked lime
b).Chloride of lime
c).Hypo chloride of lime
d).Hypo chlorite of lime
Correct Answer:
Hypo chlorite of lime
Explanation:
Q141). The percentage of chlorine in fresh bleaching powder is
a).20 to 25%
b).25 to 30%
c).30 to 35%
d).35 to 40%
Correct Answer:
30 to 35%
Explanation:
Q142). The temporary hardness in water is caused due to the salts like
a).Chlorides
b).Nitrates
c).Carbonates
d).Sulphates
Correct Answer:
Carbonates
Explanation:
Q143). The permanent hardness in water is caused due to the salts like
a).Chlorides
b).Nitrates
c).Sulphates
d).All of these
Correct Answer:
All of these
Explanation:
Q144). The temporary hardness due to calcium bicarbonates can be removed by
a).Boiling
b).Lime process
c).Lime soda process
d).Zeolite process
Correct Answer:
Boiling
Explanation: