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Synthetic Fibres and Plastics Test - 31

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Synthetic Fibres and Plastics Test - 31
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  • Question 1
    1 / -0
    Which of the following represents the correct match for items in Column A with those in Column B.                   
    Column A.                       Column B.
    I. Nylon                        (i) Thermoplastic
    II. PVC                         (ii) Thermosetting plastic
    III. Bakelite                  (iii) Fiber
    Solution
    Nylon is a thermoplastic that is processed to make nylon fibers. These are used in fabrics, pipes, tents, ropes, carpets, etc.
    PVC is a thermoplastic that becomes mouldable above a specific temperature and solidifies upon cooling.
    Bakelite is thermosetting plastic. It is used in making switches, electrical appliances, kitchenware.
    $$ I - (iii),$$ Fiber
    $$II - (i),$$  thermoplastic
    $$III - (ii)$$ thermosetting plastic
  • Question 2
    1 / -0
    The material similar to silk in appearance is 
    Solution
    $$\text{Rayon has a similar appearance to silk.}$$ Rayon is cheaper than silk and can be woven like silk fibers. It is obtained by chemical treatment of wood pulp.
  • Question 3
    1 / -0
    Polycot is obtained by mixing 
    Solution
    $$\text{Polycot is obtained by mixing polyester and cotton.}$$ 
    Synthetic fibre is formed by a combination of chain of small units called the polymers. The synthetic polyester fibre is spun in combination with the natural cotton fibre to produce the blended material called the polycot or cotton-blended polyester.
  • Question 4
    1 / -0
    Which is a thermosetting plastic?
    Solution
    Thermosetting plastics are the plastics that are once moulded can not be softened by heating. $$\text{Melamine, bakelite}$$ are the examples.
    Option $$A$$ is correct.
  • Question 5
    1 / -0
    Which of the following is not a common property of plastics?
  • Question 6
    1 / -0
    Which of the following group contains all synthetic substances?
    Solution
    Nylon was the first commercially prepared synthetic polymer.
    Terylene or Polyethylene terephthalate or polyester are synthetic fibres.
    Wool is the textile fibre obtained from sheep and other animals
    Cotton is a soft, fluffy staple fibre that grows in a boll, or protective capsule, around the seeds of cotton plants. The fibre is almost pure cellulose. so it is not synthetic.
    Polycot is a mixture of polyester and cotton.
    Acrylic yarn is a man-made fibre, formed of polymers created from petroleum products i.e. crude oil.
    Silk is a natural fibre obtained from silkworms.
    Rayon is derived from natural cellulose and cannot be considered synthetic.
    PVC, Polythene, Bakelite three are all synthetic polymers prepared from chemical processes by man-made efforts and raw materials.
    Hence the correct option is B.
  • Question 7
    1 / -0
    Which of the following is a source of rayon?
    Solution
    $$\text{Wood pulp is a source of rayon.}$$ Rayon is manufactured from wood pulp that in turn is a cellulose based raw material that occurs naturally. This wood pulp is transformed into a soluble compound. The fact that wood pulp is one of the key sources of rayon makes it an inexpensive fiber.


  • Question 8
    1 / -0
    Which is not property of plastics?
    Solution
    Plastics are non-reactive due to which they are resistant to the attack of surroundings.
    They are very light weighted.
    They have high durability i.e., they have a long life.
    They are insulators and hence, don't conduct electricity and heat.
    Hence, the correct option is D.
  • Question 9
    1 / -0
    Polyester is a polymer of?
    Solution
    Polyester (Poly+ester) is actually made up of the repeating units of a chemical called an ester. Esters are the chemicals which give fruits their smell. Fabrics are sold by names like polycot, polywool, terrycot, etc.
  • Question 10
    1 / -0
    Which of the following is a bio-degradable polymer?
    Solution
    Of all the given options, the only cellulose is a bio-degradable polymer.
    All other options are synthetic polymers and are non-biodegradable,
    Hence, Option $$B$$ is the correct answer.
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