Question

4. PH value of drinking water as per who standards should lie between
5 and 5.5
6 and 7
7 and 7.5
07 and 8.5*
7.85
*
2. The amount of residual chlorine after a period of contact 10 to 20 minutes is
0.1 to 0.2 ppm.
0.2 to 0.3 ppm.
0.3 to 0.4 ppm
0.4 to 0.5ppm
3. A rural water supply serves a population of 10,000 at the rate of 50 litres pa
For the chlorine dose of 2 PPM the required amount of bleaching powder with
hlorine will be
0.5 kg
5 ko *​

Answer 1

Answer:

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