Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.
No, the handle and bristles of a tooth brush should not be made of the same material because the bristles should be soft and the handle should be hard. So the bristles should be made up of soft material so that it does not harm the gums. The handles should be made up of hard material so that it can give firm grip.
Rana wants to buy shirts for summer. Should he buy cotton shirts or
shirts made from synthetic material? Advise Rana, giving your reason.
Give examples to show that plastics are noncorrosive in nature.
‘Avoid plastics as far as possible’. Comment on this advice.
Match the following of column I correctly with the phrases given in column II:
| A. Polyester | (i) Prepared by using wood pulp |
| B. Teflon | (ii) Used for making parachutes and stockings |
| C. Rayon | (iii) Used to make non-stick cookwares |
| D. Rayon | (iv) Fabrics do not wrinkle easily |
