Gutta parcha rubber is:

1. a trans-1,4-polyisoprene polymer

2. a very hard material

3. a natural polymer

4. all of the above

Which one of the following is an example of a thermosetting polymer ?

The polymer that is not prepared by condensation process is: 

1. Melamine

2. Glyptal

3. Dacron

4. Neoprene

Buna-S is a synthetic copolymer of:

1. Styrene and buta-1,3-diene.

2. Styrene and ethylene.

3. 1,3-Butadiene and ethylene.

4. None of the above.

Buna rubber is a polymer of:

(1) 1,3-btadiene

(2) vinyl acetate

(3) styrene

(4) none of these

Natural rubber is a polymer of :-

1. Isoprene

2. Styrene

3. Ethylene

4. Butadiene

Polymer that is used to make non stick cookware is: 

1. PVC

2. Polysterene

3. Polyethylene

4. PTFE

A copolymer of isobutylene and isoprene is called:

(a) butyl rubber                   (b) buna-S

(c) buna-N                          (d) thiokol

Terylene is a:

1. Polyamide                     

2. Polyester

3. Polyether                       

4. Long chain hydrocarbon

Thermosetting plastics are:

(a) cross-linked polymers

(b) don’t melt or soften on heating

(c) cross-linking is usually developed at the time of moulding where they harden reversibly

(d) all of the above