Page 38 - Science Class 08
P. 38

5.   All plas cs have one common property, what is it?
                  6.   Why are plas c bo les commonly used to store chemicals in a chemistry laboratory?

              F.   Short answer ques ons.
                  1.  What do you mean by synthe c materials?
                  2.  What is polymerisa on?

                  3.  What are plas cs?
                  4.  What are the two different types of plas cs?
                  5.  What are thermose ng plas cs?
                  6.  Why recycling is the best way of the disposal of plas c wastes?

                  7.  What is synthe c fibre?
                  8.  Write the property of polyester.
              G.  Long answer ques ons.

                  1.  What is the need for synthe c materials?
                  2.  Differen ate between natural and synthe c polymers.
                  3.  Differen ate between thermoplas cs and thermose ng plas cs.
                  4.  Write some common uses of plas cs.

                  5.  Write any five advantages of using plas cs.
                  6.  Why disposal of plas c wastes is a problem?
                  7.  How is rayon fibre made?
                  8.  Write a short note on nylon.


             Project ActivityActivityActivity
             Project
             Project
             Project Activity
              A.   Make groups of 10. Visit shops and houses in your neighbourhood or in the vicinity of your
                  school. Encourage shoppers, shopkeepers and the general public to use cloth bags or recycled
                  paper bags. Also, discuss with them the proper ways of disposal of plas cs.
                  You can take the help of organisa ons that carry out these kinds of awareness programmes.

              B.   Form a plastic awareness club with your friends and design a poster on the topic “Say No To
                  Plas c” to discourage people from using plas c bags.


             HO
             HO
             HOTSTSTS
             HOTS
              A.  Do you think rayon when burnt will s ck to the body like other synthe c fibres?
              B.  Burning co on smells like burning paper while burning wool smells like burning hair. Why?

              C.  Which  property  of  plas cs  makes  them  so  useful,  but  also  makes  them  an  environmental
                  hazard?











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