Thermocol is a spongy, porous, rigid or flexible foamed plastic, obtained by blowing gas/air through molten__________________?

A. Saturated polyester
B. Polyurethane
C. Polystyrene
D. Either B. or C.

In nylon-6, the number 6 represents the total number of_________________?

A. Carbon atoms in the ring
B. Carbon atoms in the linear polymer chain
C. Nitrogen atoms in the ring
D. Hydrogen atoms in the ring

The process involved in converting rubber into a thin sheet or coating it on fabric is called__________________?

A. Extrusion
B. Mastication
C. Calendaring
D. Vulcanisation

Styrene butadiene rubber (SBR) is never used for making__________________?

A. Coated fabrics
B. Front wheel tyres of aeroplanes (i.e., heavy duty tyres)
C. Gaskets
D. Soles of shoes

Acrilan fibres used for making cloth, carpet & blankets, which is a hard, horny & high melting polymeric material is nothing but____________________?

A. Polyacrylonitrile
B. Polyamide
C. Saturated polyester
D. Alkyd resin

_______________ is normally used for the manufacture of refrigerator components and transistor parts?

A. Polypropylene
B. Polystyrene
C. Polyester
D. Polyurethane

Which of the following rubbers has the widest service temperature range (-75 to 275°C) ?

A. Butyl rubber
B. Silicon rubber
C. Nitrile rubber
D. Silicone rubber

In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of__________________?

A. Cross linked polystyrene
B. Phenol formaldehyde resins
C. Polyesters
D. Polyamides

Nylon-66 compared to nylon-6 has __________________?

A. Lower melting point
B. More abrasion resistant properties
C. Higher hardness
D. All A., B. and C.

Cross linked polymers are__________________?

A. Thermoplastic
B. Thermosetting
C. Either A. or B.
D. Fibres only