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SAI INTERNATIONAL SCHOOL


                                                    CHEMISTRY
                                                      Class-VIII


                                Topic - SYNTHETICFIBRES AND PLASTICS
                       Sub-Topic – Thermoplastics and Thermosetting Plastics,


                                          Useful Properties of Plastics



                                               HOME ASSIGNMENT



        Objective:
           i.   Which of the following is not a characteristic of plastics?

               a. Plastics are poor conductors of heat.
               b. Plastics are insoluble in water.
               c. Plastics are non-inflammable.
               d. Plastics do not react with water and air.
          ii.   Which of the following materials is the best for making garments and jackets that can be
               used in wet or damp environment?
               a. Polyester          b. Cotton             c. Wool              d. PVC
          iii.   Fruits have characteristic smells. Which of these chemicals is responsible for it?
               a. Yeast              b. Alcohol            c. Cellulose         d. Esters

         iv.   Pick the wrong option:
               a. Terylene           b. Melamine           c. PVC               d. Polythene
          v.   PVC is an example of:
               a. Plastic                   b. thermosetting plastic
               c. Thermoplastics            d. Acrylic



        Subjective:

        Q. No.                                      Questions                                         Marks
           1.     For what the term PET is usually used?                                                 1
           2.     Which type of plastic is used to make electrical switches?                             1
           3.     State four different examples of plastics.                                             1
           4.     Give examples to show that plastics are noncorrosive in nature.                        3
           5.     Explain the difference between thermoplastic and thermosetting plastics.               3













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