_______________________ is not a condensation polymer ?

A. Teflon
B. Nylon-66
C. Dacron
D. Polystyrene

Softening point of high density polythene is about ______________ °C?

A. 85
B. 135
C. 165
D. 205

Which of the following is not an elastomer ?

A. Polyisoprene
B. Neoprene
C. Nitrile-butadiene
D. None of these

Thermosetting materials_________________?

A. Are cross-linked molecules
B. Soften on application of heat
C. Are solvent soluble
D. None of these

Polymers are_________________?

A. Micro-molecules
B. Macromolecules
C. Sub-micromolecules
D. None of these

_____________ polythene is most prone to stress-cracking ?

A. High density
B. Low density
C. Cross-linked
D. Linear low density

Styrene which is a monomer for the production of polystyrene, is commercially produced by the __________________?

A. Catalytic dehydrogenation of ethyl benzene
B. Dehydration of ethyl alcohol followed by hydrogenation
C. Reacting ethylene oxide with acetaldehyde
D. Fermentation of starch

Most of the fibre forming polymers are crystalline in nature, one of the exceptions being ______________ which is amorphous in nature?

A. Nylon
B. Polyacrylonitrile
C. Polypropylene
D. Polyester

Which of the following is not a condensation polymer ?

A. Bakelite
B. Melamine polymer
C. Poly-methyl-methacrylate (PMMA)
D. None of these

Phenol formaldehyde __________________?

A. Employs addition polymerisation
B. Employs condensation polymerisation
C. Is a monomer
D. Is an abrasive material