Problem 44
The turbidity of a polymer solution measures (a) light transmitted by the solution (b) light scattered by the solution (c) a light absorbed by solution (d) none of these
Problem 45
If \(\mathrm{N}_{1}, \mathrm{~N}_{2}, \mathrm{~N}_{3} \ldots \mathrm{N}_{\mathrm{i}}\) are the number of molecules with molecular masses \(M_{1}, M_{2}, M_{3} \ldots M_{i}\) respectively, then the number average molecular mass \(\left(\bar{M}_{w}\right)\) is given by (a) \(\frac{\sum \mathrm{N}_{\mathrm{i}} \mathrm{M}_{\mathrm{i}}^{2}}{\sum \mathrm{N}_{\mathrm{i}} \mathrm{M}_{\mathrm{i}}}\) (b) \(\frac{\sum \mathrm{N}_{\mathrm{i}} \mathrm{M}_{\mathrm{i}}}{\sum \mathrm{N}_{\mathrm{i}}}\) (c) \(\frac{\sum \mathrm{M}_{\mathrm{i}}^{2}}{\sum \mathrm{N}_{\mathrm{i}}}\) (d) \(\frac{\sum \mathrm{N}_{i} \mathrm{M}_{\mathrm{i}}}{\sum \mathrm{M}_{\mathrm{i}}}\)
Problem 47
The best way to prepare polyisobutylene is (a) coordination polymerization (b) free radical polymerization (c) cationic polymerization (d) anionic polymerization
Problem 48
Which of the following is a biodegradable polymer? (a) cellulose (b) nylon-6 (c) polythene (d) polyvinyl chloride
Problem 49
The substance used to harden the rubber for tyre manufacture is (a) \(\mathrm{CaC}_{2}\) (b) wax (c) carbon black (d) 1,3 -butadiene
Problem 50
Which of the following is not correct regarding terylene? (a) synthetic fibre (b) thermosetting plastic (c) step-growth polymer (d) condensation polymer
Problem 51
Perlon is another name of (a) Nylon-610 (b) Nylon-44 (c) Nylon-6, 6 (d) Nylon-6
Problem 52
Cellulose is a condensation polymer of (a) \(\alpha\)-galactose (b) \(\alpha\)-glucose (c) \(\beta\)-glucose (d) \(\beta\)-galactose
Problem 53
Which one of the following polymers is prepared by condensation polymerization? (a) Nylon-6, 6 (b) Teflon (c) Rubber (d) Styrene
Problem 54
Toluene di-isocyanate is used to prepare (a) polyamides (b) polyurethanes (c) polycarbonates (d) polyesters
