PPSC CE_QUIZ 4

The biochemical oxygen demand of treated water (Drinking water) should be

As per the environment protection rules, the permissible limit for the total suspended solids for disposal over marine coasts is

It was given that the threshold odour number of a sample of water was 8 then find out the amount of distilled water that needs to be added to 250 ml of sample so that its odour is hardly detectable.

In which of the following zones the concentration of dissolved oxygen drops below 4ppm?

If the moisture content of a sludge is 99% and it is stored in a container of volume 0.255 m³, then what will be the volume of the sludge if the water content is reduced to 92%?

If waste is fairly biodegradable and can be effectively treated biologically, then