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  • Question

  • Which of the following is not a natural polymer?


  • Options
  • A. Nucleic acids e.g. RNA and DNA
  • B. Polysaccharides
  • C. Polyisoprene
  • D. Polyurethane

  • Correct Answer
  • Polyurethane 

    • Polymer Technology problems

    Search Results

    • 1. Melt spinning of polymers involves the forcing of polymer melt through spinnerettes (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the __________ fibres.

    • Options
    • A. acrylic
    • B. polyester
    • C. nylon 6:6
    • D. polypropylene
      • Discuss
    • 2. Cation exchange resins used in water treatment is made from __________ resin.

    • Options
    • A. urea formaldehyde
    • B. epoxy
    • C. amino
    • D. phenolic
      • Discuss
    • 3. Nylon-66 is manufactured from

    • Options
    • A. adipic acid and hexamenthylene diamine.
    • B. caprolactum.
    • C. maleic anhydride and hexamethylene diamine.
    • D. dimethyl terephthalate (DMT) and ethylene glycol.
      • Discuss
    • 4. In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher

    • Options
    • A. densities
    • B. melting point
    • C. tensile strength
    • D. hardness, rigidity & brittleness
      • Discuss
    • 5. Typical solvent polymerisation reaction conditions for the production of high density polythene by Zeigler process is

    • Options
    • 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.
      • Discuss
    • 6. Pick out the wrong statement.

    • Options
    • A. Addition polymers are generally formed by chain growth polymerisation.
    • B. Condensation polymers are generally formed by step growth polymerisation.
    • C. Teflon is formed by step growth polymerisation.
    • D. Bakelite is formed by step growth polymerisation.
      • Discuss
    • 7. Polyvinyl acetate is never used for making

    • Options
    • A. moulded articles
    • B. fibres
    • C. adhesives
    • D. all (a), (b) & (c)
      • Discuss
    • 8. Density of low density polythene is about __________ gm/c.c.

    • Options
    • A. 0.38
    • B. 0.56
    • C. 0.81
    • D. 0.91
      • Discuss
    • 9. In case of wet spinning of polymers, the polymer solution is forced through spinnerates into, a coagulating bath to give a filament form. Wet spinning is not used in case of the __________ fibres.

    • Options
    • A. viscose rayon
    • B. acrylic
    • C. polyvinyl acetate
    • D. saturated polyester
      • Discuss
    • 10. 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?

    • Options
    • A. Ethylene glycol
    • B. Stearic acid estors
    • C. Tricresyl phosphate
    • D. Esters of phthalic acid
      • Discuss

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