Bristles of tooth brushes are made of

Condensation polymerisation of __________ produces bakelite.

A. Propylene

B. Phenol & formaldehyde

C. Phenol & acetaldehyde

D. Urea & formaldehyde

Polymethyl methacrylate, which is an acrylic resin, is also called

A. Thiokol

B. Plexiglass or lucite

C. Dacron

D. Teflon

Scouring is a finishing operation during the manufacture of fibre, which aims at __________ of fibres.

A. Improving the stretchability

B. Dyeing/colouring

C. Detergent solution washing

D. Glycol soaking

__________ scrap can be recycled & reutilised.

A. Bakelite

B. Epoxy resin

C. Polythene

D. None of these