Civil Engineering MCQs
Q The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about______________?
  • A A. 0.01 to 0.05 ppm
  • B B. 0.05 to 0.5 ppm
  • C C. 0.5 to 1.0 ppm
  • D D. 1.0 to 5.0 ppm
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