500 Best Environmental Engineering- MCQ
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:
Q145). The permanent hardness of water can be removed by
a).Adding alum
b).Adding chlorine
c).Boiling
d).Zeolite process
Correct Answer:
Zeolite process
Explanation: