I. They are heavy and plumbing work is difficult |
II. Corrosion problem is eliminated and hence corrosion related contamination of water is avoided and life of the pipes increases |
III. Inner surface of pipes may be made smooth to reduce friction losses, thus saving on electricity bills and conserving energy |
A) I & II
B) II & III
C) Only III
D) All the above
Correct Answer: B
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