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Polymer Technology

Polymer Technology
Plastic articles are normally produced by __________ moulding.

Dry sand
Shell
Injection
Green sand

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Polymer Technology
Polyurathane can not be used for making

Coating material
Mattresses & foam
Adhesives
Bottles

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Polymer Technology
Flexible plastic pipes are made of

High density polyethylene (HDPE)
Low density polyethylene (LDPE)
Unsaturated polyester
Polypropylene

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Polymer Technology
Molecular weights of plastics ranges from

20000 to 25000
1000 to 5000
10⁹ to l0¹¹
5000 to 1000

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Polymer Technology
Out of all the elastomers, natural rubber has the longest elongation range & flexibility of the order of __________ percent.

2000-2500
1-1000
1500-2000
1000-1500

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Polymer Technology
__________ is produced by polymerisation of chloroprene.

Thiokol (a polysulphide rubber)
Neoprene
Butyl rubber
Polyurathane rubber

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