Which of the following materials are non-crystalline?
Which of the following are non-magnetic materials?
(a) What is meant by non-biodegradable waste materials? Give two examples of non-biodegradable wastes.
(b) Which of the following materials are biodegradable? Animal bones, Iron nails, Plastic mugs, Leather belts, Silver foil.
Which of the following materials is non-biodegradable?