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

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

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Polymer Technology
Thermocole (expanded polystyrene) is not used for

Low temperature thermal insulation as in refrigerator and air conditioners
Accoustic control and ceiling for building
Packing of delicate electronic gadgets
High temperature thermal insulation in furnaces

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Polymer Technology
Pickout the wrong statement.

Polymers made of more than one monomer is called copolymer or mixed polymer
Polymers made of only one monomer is called homopolymer
The intermoleculer forces in ther-mosplastic polymers are intermediate to that of elastomers & fibres
Vulcanised rubber is more elastic than natural rubber

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