POLYMER TECHNOLOGY QUIZ

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

Polymers having more aliphatic character are more soluble in aliphatic solvents, while those polymers having more aromatic character are more soluble in aromatic solvents

Swelling tendency or solubility of polymers in a particular solvent decreases with increase in molecular weight of the solvent

High molecul ar weight polymers on dissolving gives solution of very low viscosity

Greater the degree of cross-linking in the polymer, lesser is its solubility

TRUE ANSWER : ?
YOUR ANSWER : ?

Valcunisation of rubber decreases its

Tackiness

Working temperature range

Tensile strength

Resistance to organic solvents

TRUE ANSWER : ?
YOUR ANSWER : ?

Condensation polymerisation of __________ produces bakelite.

Propylene

Urea & formaldehyde

Phenol & acetaldehyde

Phenol & formaldehyde

TRUE ANSWER : ?
YOUR ANSWER : ?

Molecular weights of plastics ranges from

1000 to 5000

10⁹ to l0¹¹

5000 to 1000

20000 to 25000

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ is a natural fibre.

Nylon-6

Dacron

Cellulose

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ polymer is used for making unbreakable crockery.

None of these

Thermoplastic

Addition

Melamine

TRUE ANSWER : ?
YOUR ANSWER : ?

Polyvinyl alcohol is used as a

Water soluble adhesive

Cation/anion exchanger

Non-sticky coating on frying pans

Textile fibre

TRUE ANSWER : ?
YOUR ANSWER : ?

Polymers are

Sub-micromolecules

None of these

Macromolecules

Micromolecules

TRUE ANSWER : ?
YOUR ANSWER : ?

Addition of stabiliser during PVC manufacture is done to

Improve its elasticity

Prevent its thermal degradation

Reduce the melt viscosity & glass transition temperature

Improve its impact strength

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not a natural fibre?

Viscose rayon

Silk

Cotton

Wool

TRUE ANSWER : ?
YOUR ANSWER : ?

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