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Polymer Technology

Polymer Technology
Plastic articles are normally produced by __________ moulding.

Injection
Shell
Green sand
Dry sand

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Polymer Technology
__________ polythene is most prone to stress-cracking

Linear low density
High density
Low density
Cross-linked

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Polymer Technology
Unbreakable crockeries are made from __________ polymers.

Polystyrene
Melamine
Polystyrene
Polyurathane

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Polymer Technology
Silicone resins, which are highly water repellant and has good heat resistance can not be used

Hydraulic fluid for heat transfer
Resin for lamination
As grease & lubricant
As room temperature adhesive

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Polymer Technology
Plexiglass (also called lucite) because of its high optical transparency is used for making lenses. It is chemically

Polytetraflouroethylene(PTFE)
Phenolic resins
Polycarbonates
Polymethyl methacrylate (PMMA)

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

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

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