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Polymers Test - 14

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Polymers Test - 14
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  • Question 1
    1 / -0
    $$CH_{2}= CH_{2}$$ is a ___.
    Solution
    $$  CH_2=CH_2  $$ is a monomer. Large number of ethylene monomeric units combine together forming a polymer called polyethylene.

  • Question 2
    1 / -0
    $$C{F}_{2} = C{F}_{2}$$ is a monomer of:
    Solution
    Tetrafluorothylene $$C{F}_{2} = C{F}_{2}$$ is a monomer of Teflon $$ { \left( -C{ F }_{ 2 }-C{ F }_{ 2 }- \right)  }_{ n }$$.

                 $$n  C{ F }_{ 2 } = C{ F }_{ 2 }   \rightarrow   { \left( -C{ F }_{ 2 }-C{ F }_{ 2 }- \right)  }_{ n }$$
  • Question 3
    1 / -0
    Which of the following is used in making automobile tyres and foot wear?
    Solution
    Vulcanised rubber is used in making automobile tyres and foot wear. Heating of rubber with sulphur is called as vulcanisation. It makes the rubber hard and more flexible.
  • Question 4
    1 / -0
    Most balloons, tyres and footballs are made-of rubber. This is because rubber is:
    Solution
    Prior to rubber tires, metal and wood were the materials in use. However it was found that natural Rubber provides better cushioning, makes less noise. Further rubber deforms under weight /force which results in larger contact patch with the road than with metal/wood tires of same diameter/width. During cornering at high speeds, the deformation of sidewall and larger contact area improves the traction or grip on the road increasing safety.
  • Question 5
    1 / -0
    Synthetic fibres are synthesized from raw material called:
    Solution
    Synthetic fibres are synthesized from a raw material called polymers.
  • Question 6
    1 / -0
    As plastics and synthetic fibers consist of repeating monomer units, they are known as ______ .
    Solution
    As plastics and synthetic fibers consist of repeating monomer units, they are known as polymers.
    Polymers are macro-molecules having high molecular weights and composed of smaller repeating units called monomers. 'Poly' means 'many' and 'meros' means 'part'.
  • Question 7
    1 / -0
    Which of the following is not a polymer?
    Solution
    Ice is not a polymer. Whereas all the others are polymers of glucose and/or fructose.
  • Question 8
    1 / -0
    Bakelite is a product of the reaction between:
    Solution
    Bakelite is formed by co-polymerization of phenol and formaldehyde (methanal).

  • Question 9
    1 / -0
    Which of the following is a way to dispose non-biodegradable materials?
    Solution
    Polymers can be recycled mechanically or chemically. In land fill polymers are buried in the ground so that they do not accumulate and cause pollution. Incineration is heating at high temperature. Heat energy released by polymers is used to generate electricity.
    Option D is correct.
  • Question 10
    1 / -0
    Which of the following is correct about cellulose?
    Solution
    Cellulose fibers can be obtained from the bark, wood or leaves of plants, or from a plant-based material. Cotton is a polymer of cellulose. It is made up of large number of glucose units.
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