E. Short-answer type questions:
1. What are man made fibres? Give examples.
2. Why do we need to blend fibres? Name one blended fibre.
3. Nylon fibres are used in making ropes for dimbing mountains. Explain.
4. What is the speciality of the fibre used for making an umbrella?
5. What are the similarities between nylon and polyester?
6. Why are plastic containers used to store food items?
7. What type of linking is found among the units which make up plastic
8. How do plastic bags pose danger to cows feeding on them?
F. Long-answer type questions:
1. Define : Monomer, Polymer, Polymerisation
How are these terms related to each other? Explain with examples.
2. How is rayon manufactured?
3. Write in brief the characteristics of synthetic fibres.
4. Write short note on : (a) Thermoplastics and (b) Thermosetting Plastics
5. What is the proper method of disposal of plastic?
Answers
ans 1.So manufactured fabric would include fabric like bamboo and rayon that come from wood pulp and man-made fabric that come from a chemical source would include fabrics like nylon, acetate and polyester that come from petroleum-derived chemicals and plastics.
ans 2.Blending is accomplished before spinning and is performed to impart such desirable characteristics as strength or durability, to reduce cost by combining expensive fibres with less costly types, or to achieve special colour or texture effects. Fabrics made from such fibres are called blends.
ans 3. Nylon fibres are used in making ropes for mountain climbing because they are having great tensile strength.
ans 4.The fabric used in a good-quality umbrella canopy is usually a nylon taffeta rated at 190T (190 threads per inch), with an acrylic coating on the underside and a scotch-guard type finish on the top.
ans 5.Both nylon and polyester may be produced using synthetic processes involving thermo plastic polymers. However, nylon is made from polyamides, while polyester is made from various polyester materials and is also able to be manufactured using plant materials. Another difference between the two is the way that they feel.
1.. so manufactured fabric would include fabric like Bambu and that come from wood Pulp and man made fabric that come from a chemical search would include fabric like nylon accept and polyester that come from petroleum and chemical and place.