_____________ moulding is used for shaping of thermosetting plastics exclusively?

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Molecular weights of plastics ranges from_______________?

A. 1000 to 5000 B. 5000 to 1000 C. 20000 to 25000 D. 109 to 1011...

Pick out the wrong statement ?

A. Linear polymers are formed from bifunctional groups only and are normally thermoplastic B. Cross-linked branched chain polymers are either elastometric or thermosetting C. Branching in case of cross-linked polymers caused by small amount of impurities in bifunctional monomer formulation reduces its solubility and increases the softening point D. Dibasic acids reacts with dihydric alcohols … Pick out the wrong statement ?Read More...

Pick out the wrong statement ?

A. Polymeric fibres are never produced by addition polymerisation B. Property of tackiness is exhibited by uncured rubber C. Sharp melting point is not observed in thermoplastic polymers D. Polythene generally has an excellent resistance to ultra violet rays...

Gutta percha rubber is_________________?

A. Soft & tacky at room temperature B. An isomer of natural rubber C. A thermosetting resin D. Recovered by coagulation of rubber latex...

Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon their________________?

A. Molecular sizes B. Magnitude of intermolecular forces C. Resistance to heat D. Polymerisation mechanism Answer: Option B...