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Polymer Technology

Polymer Technology
Plastic articles are normally produced by __________ moulding.

Shell
Injection
Green sand
Dry sand

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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?

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

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Polymer Technology
Visco-elastic behaviour exhibited by plastics is a __________ like behaviour.

Neither solid nor liquid
Liquid
Solid
Combination of solid & liquid

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Polymer Technology
Celluloid is

Cellulose acetate butyrate
Regenerated cellulose
Cellulose acetate
Cellulose nitrate

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Polymer Technology
Size range of polymer molecules varies from __________ metre.

10⁻¹ to 10⁻²
10⁻² to 10⁻⁵
10⁻⁴ to 10⁻⁷
10⁻⁸ to 10⁻¹⁰

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Polymer Technology
The monomer of poly vinyl chloride (PVC) is

Ethylene dichloride
Chloroethene
Ethyl chloride
Chloroform

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