Environmental Engineering Mcqs
Q. The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about______________?
a. 0.01 to 0.05 ppm
b. 0.05 to 0.5 ppm
c. 0.5 to 1.0 ppm
d. 1.0 to 5.0 ppm
No explanation is available for this question!
