Synthetic Fibres and Plastics Worksheet-5

Synthetic Fibres and Plastics Worksheet-5

1. The arrangement of the molecules in a sample of plastic can be:

(a) Linear

(b) Cross Linked

(c) Both Linear and Cross Linked

(d) Niether A or B

2. Cotton is a biodegradable fibre. The approximate time taken by cotton to degrade completely is:

(a) 4-5 years                                  (b) 10-12 months

(c) 2-3 years                                  (d) 2-5 months

3. Silk is a fibre used to make different garments. The cultivation of silk worm to obtain fibre from them is known as:

(a) Pisiculture                               (b) Sericulture

(c) Orchard Culture                     (d) Fibre Culture

4. Carpets are made from Rayon and which of the following fibres?

(a) Cotton          (b) Wool            (c) Silk                (d) Jute

5. Jute as a fibre is now a days encouraged than plastics in making bags because :

(a) Jute is biogedradable

(b) Jute products are cheaper

(c) Jute is easier to be imported

(d) Jute is stronger

6. Which of the following materials is the best for making garments and jackets that can be used in wet or damp environments?

(a) Polyester     (b) Wool            (c) Cotton          (d) None of these

7. Rayon is called a regenerated fibre because

(a) It can be easily dyed in a variety of colours

(b) It can absorb sweat

(c) Its original raw material, cellulose, is broken down and then reformed.

(d) None of the above.

8. When we burn the following which of them leaves no residue?

(i) Cotton

(ii) Terylene

(iii) Jute

(iv) Nylon

(a) (i) & (iii)      (b) (ii) & (iv)     (c) (i) & (ii)        (d) (iii) & (iv)

9. Which of the following has the highest tensile strength?

(a) Silk               (b) Wool            (c) Cotton          (d) Nylon

Answer Key:

(1)-(c); (2)-(d); (3)-(b); (4)-(b); (5)-(a); (6)-(a); (7)-(c); (8)-(b); (9)-(d)