500 Best Irrigation Engineering MCQ
Q65). The maximum acidity in water will occur at a pH value of
a).0
b).2
c).7
d).14
Correct Answer:
0
Explanation:
Q66). The most common cause of acidity in water is
a).Hydrogen
b).Oxygen
c).Carbon dioxide
d).All of these
Correct Answer:
Carbon dioxide
Explanation:
Q67). The alkalinity in water is caused by
a).Sodium carbonate
b).Potassium carbonate
c).Calcium hydrogen
d).All of these
Correct Answer:
All of these
Explanation:
Q68). The maximum permissible chlorine content for public supplies should be between
a).0.1 to 0.2 ppm
b).0.3 to 0.4 ppm
c).1.2 to 4 ppm
d).6.5 to 8 ppm
Correct Answer:
0.1 to 0.2 ppm
Explanation:
Q69). The maximum permissible quantity of iron and manganese in water for domestic purposes should be
a).0.1 ppm
b).0.3 ppm
c).0.6 ppm
d).0.8 ppm
Correct Answer:
0.3 ppm
Explanation:
Q70). The pH value of water for public supplies is limited from
a).2.5 to 6.5
b).6.5 to 8
c).8 to 10.5
d).10.5 to 14
Correct Answer:
6.5 to 8
Explanation:
Q71). The maximum permissible quantity of lead in water for domestic supplies is
a).0.01 ppm
b).0.05 ppm
c).0.50 ppm
d).1 ppm
Correct Answer:
0.05 ppm
Explanation:
Q72). The maximum permissible fluorine content in water for domestic supplies should be (in ppm)
a).0.15
b).1.5
c).15
d).150
Correct Answer:
1.5
Explanation: