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UPSC Civil Service Exam Questions - Engineering

Q1:

Which of the following statements is NOT correct ?

A Chlorides in potable water may be present from 300 ppm to 500 ppm.

B In order to be safe against pathogenic bacteria residual chlorine should remain between 0.05 ppm and 0.20 ppm.

C Presence of iron and maganese in excess of 0.3 ppm in dirinking water is objectionable.

D pH value for pure water is nearly 7.

ANS:A - Chlorides in potable water may be present from 300 ppm to 500 ppm.

200ppm acceptable limit.

1000ppm permissible limit.