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Synthetic Fibres and Plastics Test - 14

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Synthetic Fibres and Plastics Test - 14
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  • Question 1
    1 / -0
    For which of the following purposes is a coating of melamine plastic used?
  • Question 2
    1 / -0
    Electrical wires have a coating of an insulting material. The material generally used for insulation is :
    Solution
    PVC is an insulator and prevents electricity to be conducted outside the wire so that electric shock can be prevented.
  • Question 3
    1 / -0
    Which one of the following is a thermosetting plastic?
    Solution
    Thermoplastics can be heated and shaped over and over again while thermosetting plastics can only be heated and shaped once.

    Melamine resin or melamine formaldehyde (also shortened to melamine) is a hard, thermosetting plastic material made from melamine and formaldehyde by polymerization.

    While polyethene is a thermoplastic polymer consisting of long hydrocarbon chains, PVC or Polyvinyl chloride, is also a thermoplastic produced by polymerization of vinyl chloride monomer (VCM) and nylon belongs to a class of polymers called polyamides is also a thermoplastic.
  • Question 4
    1 / -0
    Polymeric organic materials are called:
    Solution
    Polymeric organic materials are called plastics.
    Most plastics are synthetic solids composed of petroleum in long chain of polymer bonds.
  • Question 5
    1 / -0
    To which of the following does the 4R principle apply the most?
    Solution
    Plastic is a man-made substance that cannot be broken down by natural microbial action. Hence, the 4R principle applies to it. 

    The 4 R principle is- $${\text{Refuse, Reduce, Reuse and Recycle}}$$. This helps in reducing the harmful effect of plastic on the environment. 

    All other options have the names of the substances which are bio-degradable and hence can be broken down by microbial action and do not cause a lot of harm to the environment.

    Thus the correct answer is option A.
  • Question 6
    1 / -0
    The use of plastic material PET is in:
    Solution
    PET (polyethylene terephthalate) is a very familiar form of polyester. It is used for making bottles, utensils, films, wires, and many other useful products. 
  • Question 7
    1 / -0
    The most suitable material for the preparation of handles of cooking utensils is :
    Solution
    Bakelite is a polymer which is scratch resistant and an excellent insulator. Due to this, it is used in making cooking utensils which do not conduct heat.
  • Question 8
    1 / -0
    Which of the following is not a common 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
    The material similar to silk in appearance is :
    Solution
    The material similar to silk in appearance is rayon. 
    Since rayon resembles silk in appearance, it is called artificial silk.
    It is a man-made fibre obtained from a natural source of wood pulp.
  • Question 10
    1 / -0
    The material which is commonly used for making kitchen containers is :
    Solution
    PET(Polyethylene Terephthalate) is used for making kitchen containers because it is a strong, durable, light-weight, non-reactive material.
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