NCERT 7th Class (CBSE) Science: Wastewater Management – Quiz
24 Multiple Choice Questions related to NCERT 7th Class (CBSE) Science: Wastewater Management – Quiz:
- Waste water from houses, industries, hospitals etc. and lain water that runs over land containing waste matter such as excreta.
- It is necessary to treat sewage treatment. It is necessary because if we put the same water in water bodies, it can cause harm to human and aquatic life.
- Sludge can be incinerated in incinerator tanks in which sludge becomes oshes. Ashes are used for construction purpose and suppliants nutrients to of the soil.