1. Disinfection of water in our country is mainly done by ____________
Correct Answer is : Chlorination
2. Wastewater can become septic by the loss of:
Correct Answer is : Dissolved oxygen content
3. Which one of the below is not an attribute of drinking water?
Correct Answer is : Source
4. The extent of water treatment depends on how many factors?
5. What is added to the water treatment tank to settle the colloidal particles?
Correct Answer is : Alum and lime