Question

Q.1 Choose the correct answer.
(05)
1. The basic component of plant fibres is
(a) Protein (bCellulose
(d) None of these
2. In which year was nylon made?
(a) 1931
(b) 1964
(d1950
3. Polymers are made up of small units called
(2) Layers
(O) Molecules
(c) Calls
(d) Monomers
4. Which of the following is a thermoplastic?
(a) Bakelite (b) Melamine
(c) PVC
(d) All of these
5 Which of the following is natural fibre?
(a) Rayon
(b) Nylon
(d) Cotton
Q.2 Fill in the blanks.
(05)
1. Synthetic fibres are synthesized from raw materials called
2 Like synthetic fibres plastic is also a
3. Synthetic fibres
on heating
4. Raw materials for preparation of synthetic fibres are obtained from substancas Eke
and
5. Rayon synthesized for the first time in
Q.3 Answer the following question.
(05)
1. Explain the difference between thermoplastic and thermosetting plastics
2. Should the handle and bristles of a tooth brush be made of the same material? Explain your
3. What is the full form of PVC?
(01)
Q.4 Long answer question.
(05)
1. Riva's father got a transfer to another place. While sorting out the things Riva found
many of her clothes of various fabrics were not fitting her or wom-out. She thought of
burning them to get rid of them. But her friend Shweta suggested donating it to some
charity house so that it can be reused.
(a) What are the two main types of fibres?
(b) Which fabrics are known to be skin friendly? Why?
(c) Why we should not burn synthetic clothes?
(d) Why synthetic clothes are famous than natural fabris?
(e) What values of Riva and Shweta are shown here!
OR
1. Describe about nylon. Write its uses and properties.​

Answer 1

Q1-

1. c)

2. a)

3. d)

4. c)

5. d)

Answer 2

Answer:

choose the correct answers The basic compent of plant fibres is