Which of the following is not a semisynthetic polymer?

 

1

(a)

cis-Polyisoprene

(b)

Cellulose nitrate

(c)

Cellulose acetate

(d)

Vulcanised rubber

The commercial name of polyacrylonitrile is .......

1

(a)

Dacron

(b)

Orlon (acrilan)

(c)

PVC

(d)

Bakelite

Which of the following statements is not true about low density polythene?

1

(a)

Tough

(b)

Hard

(c)

Poor conductor of electricity

(d)

Highly branched structure

Which of the following polymers,need atleast one diene monomer for their preparation?

1

(a)

Dacron

(b)

Buna-S

(c)

Neoprene

(d)

Novolac

Which of the following are characteristics of thermosetting polymers?

1

(a)

Heavily branched cross linked polymers

(b)

Linear slightly branched long chain molecules

(c)

Become infusible on moulding so cannot be reused

(d)

Soften on heating and cooling,can be reused