Why is it not advisable to wear clothes made up of synthetic fibres in hot and humid weather?
Important Questions on Synthetic Fibres and Plastics
A brief information about three different plastics is given below :
X : Thermoplastic which can be rolled into sheets
Y: Thermoplastic which is used as a covering for electric wires.
Z: Thermosetting which is used for making plugs and switches.
Identify and .
| X | Y | Z | |
| (A) | Melamine | Teflon | Bakelite |
| (B) | Bakelite | Malamine | Polythene |
| (C) | Polythene | Polyvinyl chloride | Bakelite |
| (D) | Polyvinyl chloride | Polythene | Melamine |
(i) All plastics do not have the same arrangement of monomer units.
(ii) Melamine resists fire and can tolerate heat better than other plastics.
(iii) Plastics with cross-linked monomers are also known.
(iv) Plastics have limited applications.
Match column I with column II and select the correct answer from the given codes.
| Column I | Column II | ||
| P. | A synthetic fibre also called artificial silk | (i) | Spandex |
| Q. | A synthetic fibre is also known as lycra | (ii) | Acrylic |
| R. | A synthetic fibre that closely resembles wool | (iii) | Rayon |
| S. | The first true synthetic fibre | (iv) | Nylon |
Match column I with column II and mark the correct option from the given codes.
| Column I | Column II | ||
| (a) | Polyester | (i) | Prepared by using wood pulp |
| (b) | Teflon | (ii) | Used for making parachutes and stockings |
| (c) | Rayon | (iii) | Used for making nonstick cookware |
| (d) | Nylon | (iv) | Fabrics do not wrinkle easily |
Select the correct option for the given statement.
I. Plastics are generally good conductors of electricity.
II. Ropes made by bakelite are used in cranes and elevators.
III. Teflon is a special plastic on which oil and water do not stick.
IV. Plastic is non-biodegradable, hence not environment friendly.
Read the given statements and mark the appropriate answer.
Statement 1: Polyester is synthesised from petrochemicals by linking ester units.
Statement 2: Polyester is a natural fibre.
