Man-made Materials - Questions

 


  1. What is a polymer?
  2. What is ester?
  3. Fill in:
    • One of the oldest man-made material is ___________.
    • _____________ is a naturally occurring polymer.
    • ____________, a natural fiber is made of cellulose.
    • __________ is a blended fibre.
    • __________ is the first fully synthetic fibre.
    • Rayon is obtained by chemical treatment of ___________.
    • Nylon was first used to make ______________.
    • The first synthetic fibre was prepared from __________, ____________ and ________.
    • A synthetic fibre that resembles wool is ___________.
    • _________ is a modern microfibre used to make sportswear.
    • Full form of PVC is _________________.
    • Full form of PET is _________________.
    • __________ is used in fireproof suits.
    • __________ is used in military uniforms.
    • Inhalation of __________ can cause cancer.
    • The process by which glass is cooled and made tougher is called __________.
    • When PVC is burnt, it gives out ___________ gas.
    • ____________ is a man made material inspired from nature.
    • The material which is similar to silk in appearance is __________.
  4. Give Reasons:
    • Nylon is most suitable for making fishing nets and toothbrush bristles.
    • Plastic containers used for microwave cooking can be made of thermosetting plastic.
    • Plastic buckets are preferred for daily use. 
  5. List three polyester fibres made from petroleum products.
  6. Differentiate Thermosetting and thermoplasts.
  7. List the advantages of using acrylic sweaters over woollen ones.
  8. State three properties of synthetic fibres.
  9. List two disadvantages of synthetic fibres.
  10. List ten properties of plastics.
  11. List the properties and uses of polythene.
  12. List the properties and uses of PVC.
  13. List the properties and uses of polystyrene.
  14. List the properties and uses of perspex.
  15. List the properties and uses of teflon.
  16. List three disadvantages of plastic.
  17. Which kind of plastic is most suitable to make the following and why?
    1. Handles of cooking utensils
    2. Electrical plugs and sockets.
    3. Furniture
  18. How is glass made?
  19. List the uses of glass.
  20. What are smart materials?
  21. Define blended fibre.
  22. Define tensile strength.
  23. Should the bristles and handle of toothbrush be made in the same material? Justify.

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