Related Mcqs:

1. In a cross linked polymer, the monomeric units are linked together to constitute a three dimensional network. Which of the following is a cross-linked polymer ?

   A. Bakelite (phenol formaldehyde)
   B. Polyester
   C. Polythene
   D. Nylon-6

2. Branched chain polymers compared to linear polymers have higher ____________________?

   A. Density
   B. Tensile strength
   C. Melting point
   D. Degree of irregularity in atomic packing

3. Cross linked polymers formed from bi-and trifunctional groups in which cross-linkage in three dimensions via few chemical bonding across linear chains occur imparts to the polymer ______________ properties?

   A. Thermoplastic
   B. Thermosetting
   C. Elastometric
   D. Brittleness

4. Branched chair polymers as compared to linear polymers have _________________?

   A. Higher melting point
   B. Higher tensile strength
   C. Lower density
   D. None of these

5. Melt spinning of polymers involves the forcing of polymer melt through spinnerates (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?

   A. Acrylic
   B. Polyester
   C. Nylon 6:6
   D. Polypropylene

6. In case of dry spinning of polymers, the polymer solution in a volatile solvent is forced through the spinnerates into a warm air chamber, where the solvent evaporates leaving behind the polymer in the filament form. Dry spinning is used for _______________ fibres?

   A. Polythene
   B. PVC
   C. Rayon
   D. Polyvinyl acetate

7. Cross linked polymers are__________________?

   A. Thermoplastic
   B. Thermosetting
   C. Either A. or B.
   D. Fibres only

8. 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?

   A. Viscose rayon
   B. Acrylic
   C. Polyvinyl acetate
   D. Saturated polyester

9. Chain growth polymerisation is a process, in which the monomers are added in a chain fashion, and it requires an initiator to produce the free radical. An example of chain growth polymerisation products is __________________?

   A. Nylon-66
   B. Teflon
   C. Polyester
   D. Bakelite

10. The inter particle forces between linear chains in nylon-66 are ______________ bonds?

    A. Hydrogen
    B. Covalent
    C. Ionic
    D. None of these