Synthetic Fibres and Plastics - Worksheets

CBSE Worksheet-01
Class–VIII Science (Synthetic fibres and plastics)

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1. Polyester is a long chain polymer of a chemical substance called: -
   1. aldehyde
   2. ester
   3. alcohol
   4. ethene
2. Which of the following represent the smallest units of a polymer: -
   1. tetramer
   2. dimer
   3. monomer
   4. octamer
3. A regenerated synthetic fibre is -
   1. rayon
   2. nylon
   3. terylene
   4. polyethene
4. The first fully synthetic fibre is -
   1. rayon
   2. nylon
   3. Acrylic
   4. Polyester
5. Match the column: -

   Fibre&	Articles made
   a. Jute	i) bristles for brushes
   b. Polyester	ii) surgical dressings
   c. Rayon	iii) bags
   d. Acrylic	iv) sails for boat
   e. Nylon	v) sweaters

6. Fill in the blanks :-
   1. Rayon is prepared from ______ .
   2. Polythene is prepared from______ .
   3. Nylon is prepared from simple chemicals obtained from ______ .
   4. Polyester is made from ______ products.
   5. ______ is called a regenerated fibre.
7. 1. Define polymerisation?
   2. For making synthetic polymers where from we get small molecules?
8. What are plant and animal fibres ?
9. Pick the odd word out of the following:-Terene, Terylene, Acrylic, Decron, Terycot.
10. Which synthetic fibre is the following cloth made up of:-
    

CBSE Worksheet-01
Class–VIII Science (Synthetic fibres and plastics)
[Answer]

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1. b
2. c
3. a
4. b
5. a. iii, b. iv, c. ii, d. v, e. i.
6. 1. cellulose
   2. ethylene
   3. coal
   4. petroleum
   5. rayon.
7. 1. The process which involves combining of a large number of simple molecules chemically so as to form a giant molecule is known as polymerisation.
   2. Small molecules which form long chains of polymers are obtained from petroleum and natural gas.
8. Plant and animal fibres are natural polymers and obtained from plant and animal sources respectively. Cotton and jute are plant fibres while wool and silk are animal fibres.
9. ACRYLIC. All contain polyester except acrylic.
10. nylon