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Polymer Technology - Section 6

  1. Thermosplastic materials

    2. A.
    do not soften on application of heat.
    B.
    are heavily branched molecules.
    C.
    are solvent insoluble.
    D.
    none of these.

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  2. Polyvinyl acetate is never used for making

    3. A.
    moulded articles
    B.
    fibres
    C.
    adhesives
    D.
    all (a), (b) & (c)

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  3. Typical solvent polymerisation reaction conditions for the production of high density polythene by Zeigler process is

    4. A.
    7 kgf/cm2 and 70 °C.
    B.
    1000 kgf/cm2 and 100°C.
    C.
    7 kgf/cm2 and 700°C.
    D.
    1 kgf/cm2 (gage) and 70°C.

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  4. Vulcanisation of rubber does not increase its

    5. A.
    elasticity
    B.
    plasticity
    C.
    ductility
    D.
    none of these

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  5. In nylon-6, the number 6 represents the total number of

    6. A.
    carbon atoms in the ring.
    B.
    carbon atoms in the linear polymer chain.
    C.
    nitrogen atoms in the ring.
    D.
    hydrogen atoms in the ring.

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  6. Cellulose content in bomboo fibre is about __________ percent.

    7. A.
    10
    B.
    20
    C.
    50
    D.
    85

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  7. In step growth polymerisation, generally only one type of reaction & some basic mechanism is involved. Step growth polymerisation reaction is not involved in the manufacture of

    8. A.
    cross linked polystyrene.
    B.
    phenol formaldehyde resins.
    C.
    polyesters.
    D.
    polyamides.

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  8. Which of the following has the weakest intermolecular forces ?

    9. A.
    Polyisoprene
    B.
    Nylon-66
    C.
    Polystyrene
    D.
    Bakelite

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  9. Properties of a polymer is affected by the

    10. A.
    chain length.
    B.
    intermolecular forces.
    C.
    branching & cross-linking.
    D.
    all (a), (b).

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  10. In condensation polymerisation as compared to addition polymerisation

    11. A.
    the monomers are unsaturated compounds.
    B.
    no co-product is lost.
    C.
    the monomers contain two functional groups.
    D.
    generally only one monomer is involved

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