Related Mcqs:

1. Molecular weight of a polymer is equal to the molecular weight of the repeat unit multiplied by the degree of polymerisation. What is the molecular weight of poly vinyl chloride (PVC), if its degree of polymerisation is 800 ?

   A. 50000
   B. 51600
   C. 49200
   D. 50800

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

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

3. 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 ___________________?

   A. Densities
   B. Melting point
   C. Tensile strength
   D. Hardness, rigidity & brittleness

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

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

5. Cellulose acetate has very high film permeability among all the polymers of the order of 5000 gm/100 m2. Which of the following polymers has the maximum film elongation (of the order of 100%) ?

   A. Water impermeable cellophane
   B. Polythene
   C. Cellulose acetate
   D. Teflon

6. Which of the following low molecular weight (<104), soft & waxy polymer is used in „chewing gum‟ ?

   A. Cellulose acetate
   B. Polyvinyl acetate
   C. Thiokol
   D. PVC

7. Which of the following polymers belong to the class of formaldehyde resin ?

   A. Melamine resins
   B. Teflon
   C. Dacron
   D. None of these

8. 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

9. Unbreakable crockeries are made from ______________ polymers?

   A. Polystyrene
   B. Melamine
   C. Polystyrene
   D. Polyurethane

10. 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