Synthetic Fibres & Plastics

Synthetic Fibres and Plastics Worksheet-4

1. Burning of plastic causes:

(a) Water pollution                      (b) Air pollution

(c) Sound pollution                      (d) All A, B, C

2. The rearing of silk worms for obtaining silk is called:

(a) Pisciculture                             (b) Sericulture

(c) Polyculture                              (d) Arboriculture

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