Class 8 Synthetic Fibres and Plastics Short Answer Questions
1.Name the natural polymer and its units
2.What is the common name of artificial silk
3.Which fibre has stronger tensile strength than steel
4.Fill in the blanks.
(i) A polymer is a chain of many small units joined together which are called ______.
(ii) The synthetic fibres are also known as ______ fibres.
(iii) The fi rst fully synthetic fibre was ______.
(iv) A fibre similar to wool is ______.
(v) A plastic used for making crockery is ______.
5.What is the full form of PVC and PET
6.Plastics used to make switches
7. Substance used as synthetic wool
8.Plastic used in fire fighting suits
9.Raw materials used to make nylon
10.The non stick coating on pans and other cooking utensils is made from
11. plastic which can be softened on heating and moulded repeatedly is called
12.The synthetic plastic used for making insulatio n cover in electrical wires/cables is
13.Artificial silk is obtained by chemical treatment of
14.Which plastic has crossed linked chains
15. Fill in the blanks :-
a. ______ burns vigorously and leaves little ash.
b. ______ burns slowly with the smell of burning ha ir.
c. ______ shrinks on burning producing black smoke.
d. ______ burns readily with the smell of burning p aper.
e. ______ shrinks if burnt and forms a black bead a long with sooty flame.
(cotton, wool, polyester, rayon, acrylic.) 16.fill in the blanks :-
a. Rayon is prepared from ______ .
b. Polythene is prepared from______ .
c. Nylon is prepared from simple chemicals obtained from ______ .
d. Polyester is made from ______ products. e. ______ is called a regenerated fibre.
(ellulose, ethylene, coal, petroleum, rayon. )
1.Name the natural polymer and its units
2.What is the common name of artificial silk
3.Which fibre has stronger tensile strength than steel
4.Fill in the blanks.
(i) A polymer is a chain of many small units joined together which are called ______.
(ii) The synthetic fibres are also known as ______ fibres.
(iii) The fi rst fully synthetic fibre was ______.
(iv) A fibre similar to wool is ______.
(v) A plastic used for making crockery is ______.
5.What is the full form of PVC and PET
6.Plastics used to make switches
7. Substance used as synthetic wool
8.Plastic used in fire fighting suits
9.Raw materials used to make nylon
10.The non stick coating on pans and other cooking utensils is made from
11. plastic which can be softened on heating and moulded repeatedly is called
12.The synthetic plastic used for making insulatio n cover in electrical wires/cables is
13.Artificial silk is obtained by chemical treatment of
14.Which plastic has crossed linked chains
15. Fill in the blanks :-
a. ______ burns vigorously and leaves little ash.
b. ______ burns slowly with the smell of burning ha ir.
c. ______ shrinks on burning producing black smoke.
d. ______ burns readily with the smell of burning p aper.
e. ______ shrinks if burnt and forms a black bead a long with sooty flame.
(cotton, wool, polyester, rayon, acrylic.) 16.fill in the blanks :-
a. Rayon is prepared from ______ .
b. Polythene is prepared from______ .
c. Nylon is prepared from simple chemicals obtained from ______ .
d. Polyester is made from ______ products. e. ______ is called a regenerated fibre.
(ellulose, ethylene, coal, petroleum, rayon. )
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