Acetate rayon is prepared from:

(1) acetic acid

(2) glycerol

(3) starch

(4) cellulose

Rubber is heated with sulfur and the process is known:

1. galvanization

2. vulcanization

3. bessemerization

4. sulphonation

Terylene is a:

(1) Polyamide                     

(2) Polyester

(3) Polyether                       

(4) Long chain hydrocarbon

Thermosetting plastics are:

1. Cross-linked polymers

2. Don’t melt or soften on heating

3. Cross-linking is usually developed at the time of moulding where they harden irreversibly

4. All of the above

Which are true for terpolymer?

(1) Contains three monomers

(2) ABS plastic

(3) A polymer of acrylonitrile, butadiene and styrene

(4) All of the above

Which is/are true for elastomers?

1. These are synthetic polymers possessing elasticity

2. These possess very weak intermolecular forces of attractions between polymer chains

3. Vulcanised rubber is an example of elastomer

4. All of the above

If N₁, N₂, N₃,.... are the number of molecules with molecular masses M₁, M₂, M₃..... respectively, then mass average molecular mass is expressed.

1. $\frac{{\mathrm{\Sigma N}}_{\mathrm{i}}{\mathrm{M}}_{\mathrm{i}}^2}{{\mathrm{\Sigma N}}_{\mathrm{i}}{\mathrm{M}}_{\mathrm{i}}}$

2. $\frac{{\mathrm{\Sigma N}}_{\mathrm{i}}{\mathrm{M}}_{\mathrm{i}}}{{\mathrm{\Sigma N}}_{\mathrm{i}}}$

3. $\frac{{\mathrm{\Sigma M}}_{\mathrm{i}}^2}{{\mathrm{\Sigma N}}_{\mathrm{i}}}$

4. $\frac{{\mathrm{\Sigma N}}_{\mathrm{i}}{\mathrm{M}}_{\mathrm{i}}}{{\mathrm{\Sigma M}}_{\mathrm{i}}}$

A copolymer of vinyl chloride and vinyl acetate is called:

1. Vinylon

2. Saran

3. Dynel

4. Orlon

In vulcanisation of rubber:

(1) Sulphur reacts to form new compound.

(2) Sulphur cross-links are introduced which resists wear and tear due to friction.

(3) Sulphur forms a very thin protective layer over rubber.

(4) All of the above.

The starting materials of PCTFE are:

(1) monochloro trifluoro ethylene

(2) tetrafluoroethylene

(3) vinyl chloride

(4) styrene