railway RRB JE (CBT I + CBT II) Mock Test 2024 Environmental Engineering Quality of Water

Which one of the following related to domestic potable water quality is CORRECT?

1
Turbidity (on Silica scale) is 15 - 20 ppm
2
Colour (on Cobalt scale) is 15 - 25 ppm
3
Hardness (expressed as CaCO3 equivalent) is 75 -115 ppm
4
BOD is 20 ppm
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