Thursday, July 26, 2012

CBSE: VIII Ch.Synthetic FIbres and Plastics Test paper

Q1. Fill in the blanks:- Ch.Synthetic Fibers and Plastics
1. Clothes are made up of ______________ which are made from __________.
2. The polymer cellulose is made up of a large number of __________units.
3. Silk fibre is obtained from _____________ whereas artificial silk is obtained by chemical treatment of __________.
4. The polymer polyester is made up of repeating units of ______________.
5. Synthetic fabrics soak ________ water than the natural fabrics and take__ time to dry.(less/more)
6. Polythene which is used to make polythene bags is an example of a ________.
7. Iron rusts when it is exposed to ______________ and _____________.
8. Plastics do not react with ______________ and __________________.
9. Plastics are generally ___________________ than metals.
10. ________________ is a special plastic on which oil and water do not stick.
Q2. Answer the following:
1. Define a polymer.
2. Name a few synthetic fibres.
3. List the unique characteristics of synthetic fibres which make them popular dress materials.
4. Explain why plastic finds such a variety of uses.
5. Differentiate between thermoplastics and thermosetting plastics.
6. List the three characteristic properties of plastics.
7. What are the advantages of using a plastic container?
8. Why do electrical wires have plastic covering?
9. Why recycled plastic should not be used for storage of food?
10. Differentiate between a biodegradable and a non-biodegradable material

Synthetic Fibre And Plastics
VIII Synthetic fiber and Plastic            Read and download
VIII Synthetic fiber and Plastic           Read and download
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