Polymers are (A) Micro-molecules (B) Macromolecules (C) Sub-micromolecules

Polymers are
(A) Micro-molecules
(B) Macromolecules
(C) Sub-micromolecules
by

1 Answer

Answer :

(B) Macromolecules
by

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Plasticisers are high boiling liquids added to plastic polymers to impart toughness and flexibility at ordinary temperature. Which of the following is not a plasticiser? (A) Ethylene glycol (B) Stearic acid estors (C) Tricresyl phosphate (D) Esters of phthalic acid

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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

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Linear polymers are normally (A) Thermosetting (B) Thermoplastic (C) Elastometric (D) Having extremely high softening poin

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Pick out the correct statement. (A) Plastics are good conductors of heat and electricity (B) All the polymers are highly crystalline in nature (C) Polymers can be vaporised by heating to a very high temperature (D) The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of polymerisation

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Branched chair polymers as compared to linear polymers have (A) Higher melting point (B) Higher tensile strength (C) Lower density (D) None of these

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Last Answer : (C) Lower density

Molecular weight of polymers are in the range of (A) 10 to 10 3 (B) 10 2 -10 7 (C) 10 7 -10 9 (D) 10 9 -10 11

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