X, Y and Z are the three types of materials. The materials X and Y a break into pieces easily when hit with an object but material Z does not break easily. The material X is used in the windows of the bathroom in our house whereas material Y is used in the windows of our drawing-room. The material Z is used in making doors and almirahs in our house.
(a) What do you think material X could be? What is the general name of materials like X?
(b) What could material Y be? Write the general name of materials like Y.
(c) What could material Z be? What is the general name of materials like Z?
Important Questions on Sorting Materials into Groups
Name two materials without lustre (having dull appearance).
Select those objects from the following which shine:
Glass bowl, Plastic toy, Steel spoon, Cotton shirt, Diamond ring
