Fill in the blanks:-
1. Clothes are made up of_______ which are made from_______
2. The polymer cellulose is made up of a large number of________ units
3. Sik fibre is obtained from______whereas artificial silk is obtained by chemical treatment of ________
4. The polymer polyester is made up of repeating units ________
5. Synthetic fabrics soak______time to dry and take_________ .(less/more) 6. Polythene which is used to make polythene bags is an example of a_______
7. Iron rusts when it is exposed to_______and________
8. Plastics do not react with______and_____
9. Plastics are generally________ than metals.
10________is a special plastic on which oil and water do not stick. plastic on them to make them flame
11. Fire-proof plastics have a coating of_______plastic on them to make them flame resistant.
12. We should always remember the 4R principle:______,________ and ________
Answers
Answer:
1. Clothes are made up of__fabric____ which are made from____Fibre___
2. The polymer cellulose is made up of a large number of____Glulose____ units
3. Sik fibre is obtained from__Silk Moth____whereas artificial silk is obtained by chemical treatment of
___wood pulp_____
4. The polymer polyester is made up of repeating units ____ester____
5. Synthetic fabrics soak___ less___ water and take_less___ time to dry.(less/more)
6. Polythene which is used to make polythene bags is an example of a_synthetic fibre______
7. Iron rusts when it is exposed to
__air_and__ water____
8. Plastics do not react with__air____and__water___
9. Plastics are generally___lighter_____ than metals.
10____Teflon__is a special plastic on which oil and water do not stick. plastic on them to make them flame
11. Fire-proof plastics have a coating of___melamine____plastic on them to make them flame resistant.
12. We should always remember the 4R principle:___Reduce, Reuse ,. Recycle Recover____