HARD
8th West Bengal Board
IMPORTANT
Earn 100

Complete the following table:

Materials used in making objects Where is it used
Polythene Making carry bags, food packets
Plastic Making mugs, buckets, etc.
Thermocol  
Nylon  

Important Questions on Occurence of Carbon and its Compounds in Nature

MEDIUM
8th West Bengal Board
IMPORTANT

Look at the pictures below, and identify the sectors in which polymers are used.

Question Image 

HARD
8th West Bengal Board
IMPORTANT

Complete the following table:

Name of polymer Its properties Uses
(i) Polythene Flexible but partially solid (like wax), insulator of electricity, inactive towards chemicals   
(ii) Teflon High melting point, poor conductor of electricity, significantly inert towards chemicals  To prepare non-stick utensils, to coat on paint of cars, in chemical 
industries 
(iii) PVC Transparent or opaque, hard, inert towards water, oil, petrol and some other chemicals  To prepare water pipes, insulation of electric wires, containers for raincoat, gum boot, slippers. 
(iv) Nylon Transparent, strong, water-resistant fibre.  
(v) Terylene Does not absorb water just like nylon, resistant to stains, strong, resistant to creasing, a fibre with long life.  Cotton threads are mixed with it to prepare terecot. Just like terylene, it is also resistant to folding, but as cotton threads are present, it can soak water and air can pass through it. So it is widely used to make clothes in a moist tropical country like ours. 

 

HARD
8th West Bengal Board
IMPORTANT

A piece of cotton and that of a synthetic cloth remain buried in soil, what will we find after a few months?

Type of cloth What you will find
Cotton cloth  
Synthetic cloth