Water Treatment – Section 1

41. Both temporary and permanent hardness of water can be removed by

A. boiling
B. distillation
C. filtration
D. decantation

Correct Answer: B. distillation

42. Coliform bacteria in the water is an indication of the presence of

A. radioactive wastes
B. excess fertilizer
C. decaying animals and plants
D. human feces

Correct Answer: D. human feces

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