CBSE  /  Class 8  /  Science  /  Synthetic Fibres and Plastics

  • 1. 
    A chain of small chemical units combined to form a large single unit is called ____

  • Polymer
  • Poly
  • Polythene
  • None of the above

  • 2. 
    Polythene and PVC are examples of

  • Bio degradable substance
  • Thermosetting plastics
  • Thermoplastics
  • Rayon

  • 3. 
    Plastics which when moulded once, cannot be softened by heating. Such plastics are called ____

  • Polythene
  • Thermoplastics
  • Polyster
  • Thermosetting plastics

  • 4. 
    Polycot is made by mixing two types of fibres namely

  • Silk + Cotton
  • Polythene + cotton
  • Silk + Polyester
  • Polyester + Cotton

  • 5. 
    The 4 R Principle is

  • Reduce, Reuse, Recycle, Recover
  • Remember, reduce, Recycle, Rejoice
  • Repeat, Rejoice, recycle, reduce
  • None of the above

  • 6. 
    _____________ is an example of natural polymer

  • Rayon
  • Cellulose
  • Nylon
  • All of the above

  • 7. 
    Which of the following is Non-biodegradable

  • Woolen clothes
  • Plastic bag,
  • Cotton cloth
  • Wood

  • 8. 
    Bakelite and Melamine are examples of

  • Thermosetting plastics
  • Silk
  • Nylon
  • Rayon

  • 9. 
    Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant.

  • Nylon
  • Rayon
  • Melamine plastic
  • Silk

  • 10. 
    The coating on modern non- stick cookware and electric iron is of

  • Terrycot
  • Rayon
  • Polyester
  • Teflon
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