Related Mcqs:

1. Addition of plasticisers to polymers results in partial neutralisation of intermolecular forces of attraction between the macro-molecules thereby increasing its__________________?

   A. Tensile strength
   B. Chemical resistance
   C. Flexibility
   D. All A., B. & C.

2. 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

3. Plasticisers are added to synthetic plastics to ________________?

   A. Impart flexibility
   B. Improve workability during fabrication
   C. Develop new improved properties not present in the original resin
   D. All A., B. and C.

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. 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

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

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

7. Phosphates (e.g., tricresyl, tributyl, tetrabutyl, triphenyl etc.) are added to polymers to act as __________________?

   A. Hardeners
   B. Anti-shrinkage agents
   C. Plasticisers
   D. Transparency improver

8. Which of the following is the most important rubber compounding ingredient which is used to improve wearing qualities of both natural rubber & SBR by imparting toughness ?

   A. Phosphorous
   B. Carbon black
   C. Pine oil
   D. Rosin

9. Pick out the wrong statement regarding the solubility characteristics of high polymers?

   A. Greater the degree of cross-linking in the polymer, lesser is its solubility
   B. Polymers having more aliphatic character are more soluble in aliphatic solvents, while those polymers having more aromatic character are more soluble in aromatic solvents
   C. Swelling tendency or solubility of polymers in a particular solvent decreases with increase in molecular weight of the solvent
   D. High molecular weight polymers on dissolving gives solution of very low viscosity

10. 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