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Polymer Technology

Polymer Technology
Paper like thin plastic articles can be produced by

Injection moulding
Blow moulding
Vacuum thermo forming
None of these

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Polymer Technology
Rayon is superior to cotton in making gauge for wound treatment, because rayon

Both B & C
Can absorb over 90% of its own weight of water
Is a synthetic polymer
Does not stick to the wound unlike cotton

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Polymer Technology
Benzoyl chloride is not used as a catalyst in the manufacture of

Polyvinyl acetate
Polypropylene
Polystyrene
Polyvinyl chloride-co-vinylacetate

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Polymer Technology
Plastic tubes & pipes are generally made by __________ moulding.

Transfer
Compression
Extrusion
Injection

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Polymer Technology
Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex?

Both A & B
Potassium alum
Ammonium alum
Neither A nor B

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Polymer Technology
Viscosity of a polymer solution or melt

Does not vary with temperature rise
Increases with increase in temperature
Decreases with increase in molecular weight
Decreases with increase in temperature

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