ASSIGNMENT WORKSHEET CLASS 8
  Name: ______________________                                                     Class: _____________

                                                                                                                               M.Marks:20

                               SYNTHETIC FIBRES AND PLASTICS

                                                                        

                                                                Worksheet  

                                                                                                                                              M.M- 20

I.Fill in the bubbles with different types of man-made fibres. List one special feature and one use for each  ( GRAPHIC ORGANIZER)                                                                                                                                                                                                                                                                                                                               (5)

                                                                                                                                                                                             

II.Classify the following as thermoplastic and thermosetting plastics.                                                                                                                                                        (5)

  Contact lenses, Non-stick pans, Styrofoam cup, Bags for food storage,Thermocol sheets, Handles of cooking utensils, Melamine plates,Electrical plugs and sockets, Furniture

III. List at least two differences between thermoplastic and thermosetting plastics                                                                                                                                                 (2)

IV.Indicate whether the statements are TRUE (T) or FALSE (F). Correct and rewrite the FALSE statements                                                                                                                                       (5)    

               

      i.        Polyester is a popular fabric because it is durable and easily washable.

    ii.        Nylon has a feel similar to wool.

   iii.        Cellulose from wood pulp is used to make rayon.

   iv.        Materials like acrylic are resistant to insects

    v.        Nylon fibres absorb water easily.

   vi.        Polymers are made up of smaller units called monomers.

  vii.        Silk and Wool, smell of burning hair when burnt

viii.        Burning of plastics leads to air pollution.

   ix.        Once set, thermosetting plastics can be made soft again

    x.        Plastics are good conductors of heat and electricity.

V .How can we protect our environment from plastic related problems?                                                                                                                                                           (3)  

                                  

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