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Polymer Technology

Polymer Technology
Density of low density polythene is about __________ gm/c.c.

0.91
0.81
0.38
0.56

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Polymer Technology
Which of the following is not a natural polymer?

Polysaccharides
Polyisoprene
Polyurethane
Nucleic acids e.g. RNA and DNA

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Polymer Technology
Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon their

Polymerisation mechanism
Molecular sizes
Magnitude of intermolecular forces
Resistance to heat

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Polymer Technology
Dacron (or terylene) fibres as compared to nylon fibres have

Poorer resistance to alkalis
Poorer dyeability
All of these
Better heat & acid resistant properties

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Polymer Technology
Celluloid is

Cellulose acetate butyrate
Cellulose acetate
Regenerated cellulose
Cellulose nitrate

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Polymer Technology
Melt spinning of polymers involves the forcing of polymer melt through spinnerettes (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the __________ fibres.

Acrylic
Nylon 6:6
Polyester
Polypropylene

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