Categorise the following materials into synthetic and natural fibres . cotton,wool,rayon,silk, polyester,jute,acrylic,nylon,flex,terylene.
Answers
Which of the following is a polyester fibre?
(a) rayon
(b) terylene
(c) nylon
(d) acrylic
ANSWER:
(b) terylene
It is a polymer (synthetic fibre) made up of small chemical molecules called esters.
Polycot, a blended fibre is made from
(a) polyester and nylon.
(b) polyester and wool.
(c) polyester and acrylic.
(d) polyester and cotton.
(d) polyester and cotton
Polyesters are wrinkle-free and do not require ironing. They absorb less water and they dry easily. It is because of these advantages of polyester over cotton that polyester is blended with cotton to form polycot.
polythene, polystyrene, nylon, PVC, rayon, terene, acrylic, formica, polycot, melamine
The list of materials mentioned above can be classified as
(a) synthetic fibres and plastics.
(b) polyester fibres and objects made of glass.
(c) man-made materials and plastics.
(d) synthetic fibres and thermoplastics.
(a) synthetic fibres and plastics
Nylon, rayon, acrylic, terene and polycot are synthetic fibres. Polythene, polystyrene, PVC, melamine and formica are plastics.
Which of the following is a thermosetting plastic?
(a) melamine
(b) teflon
(c) polythene
(d) PVC