Question

Materials which are discard by us as useless and unwanted materials are known as __.

Answer 1

Materials that are discarded by us as useless and unwanted are known as wastes. Waste includes solid, liquid, and gaseous wastes.

Waste (or wastes) are unwanted or unusable materials. Waste is any substance that is discarded after primary use or is worthless, defective, and of no use.