Page 41 - Science Class 06
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in  the  forma on  of  long  fibres  cellulose         Nylon  was  made  by  condensa on
              known  as  rayon.  Rayon  fibre  is  chemically        polymerisa on  of  small  organic  molecules
              iden cal to co on by having a shine like silk.        not found naturally. The material so made is

              The rayon fibres so obtained are spun into             melted and spun into yarn.
              thread  and  finally  woven  into  clothes.            Nylon  fibres  are  excep onally  strong  and

              Rayon  is  used  on  a  large  scale  in  India  for   elas c  and  stronger  than  polyester  fibres.
              making  tex les,  tyre  cord,  carpets  and           The  fibres  have  excellent  toughness,
              surgical dressings.                                   abrasion  resistance  and  are  easy  to  wash

              Nylon                                                 and to dye in a wide range of colours. The
                                                                    filament  yarns  provide  a  smooth,  so   and
              Nylon  was  first  produced  by  American              lightweight fabric of high resilience.

              scien sts.  They  produced  it  a er
              synthesising  polyamide  synthe c  fibres.







               Nylon is an acronym for the New York (NY) and London (LON).







               1.   The fibres that are obtained from co on, jute and silk are known as ___________.
                   (a)  synthe c fibres                            (b)  natural fibres

                   (c)  ar ficial fibres                            (d)  plas cs

               2.   The  process  by  which  ar ficial  fibres  are  made  from  simple  molecules  is  called
                   ___________.
                   (a)  thermose ng                               (b)  polymerisa on

                   (c)  polymer                                   (d)  monomer
               3.   Which fibre is made from regenerated cellulose?

                   (a)  Rayon                                     (b)  Nylon
                   (c)  Polyester                                 (d)  Acrylic

               4.   Rayon is chemically iden cal to ___________, but resembles___________.

                   (a)  wool, nylon                               (b)  nylon, wool
                   (c)  silk, co on                               (d)  co on, silk

               5.   Rayon clothes are comfortable to wear in ___________.
                   (a)  winter                                    (b)  rainy season

                   (c)  summer                                    (d)  both (a) and (b)



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