घरेलू कचरे का वह प्रकार जो स्पष्ट रूप से मानव और पशु मल को दर्शाता है, क्या कहलाता है?

Turbidity in water is measured on which standard scale?

Mudball formation in rapid sand filters is the result of:

In a water sample, if 2 mg of platinum cobalt salt is dissolved in 1 litre of distilled water, then the colour produced is equal to: