Available Answers

1. 1.

   Fill in the blanks.

   1. _______________ is also called artificial silk.
   2. _______________ is used in fishing nets.
   3. _______________ fibre has elastic property.
   4. _______________ fibre is very comfortable to wear in summer and humid weather.
   5. _______________ fibre has linear and cross-linkage of small units.
2. 2.

   Tick (√) the correct option.

   1. Which of the following fibres is made from a raw material obtained from plants?
      1. Nylon
      2. Terylene
      3. Polyester
      4. Rayon
   2. Plastic that can be repeatedly heated and moulded into the desired shape is
      1. polythene
      2. bakelite
      3. melamine
      4. none of the above
   3. Which of the following is a synthetic fibre?
      1. Cotton
      2. Wool
      3. Silk
      4. Nylon
   4. Which of the following is a thermosetting plastic?
      1. Polythene
      2. Melamine
      3. PET
      4. Polyvinyl chloride
3. 3.

   Match the columns.

   COLUMN A	COLUMN B
   1. Cotton	a. To make bedsheets
   2. Nylon	b. Synthetic fibre
   3. Rayon mixed with cotton	c. Natural fibre
   4. Rayon	d. To make carpets
   5. PVC	e. Heat resistant
   6. Melamine	f. Insulators on electric wires

4. 4.

   Give two examples each of natural and synthetic fibres.

5. 5.

   Why are natural fibres preferred over synthetic fibres?

6. 6.

   What are polymers?