MCQOPTIONS
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MCQOPTIONS
This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Polymer Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The average functionality of a polyfunctional system is 2.4. What will be the average degree of polymerization for 80% completion of reaction? |
| A. | 20.55 |
| B. | 27.67 |
| C. | 50.3 |
| D. | 2.97 |
| Answer» C. 50.3 | |
| 2. |
How is the extent of reaction, p, of a polycondensation reaction related to the average functionality, f, of the system? |
| A. | proportional to f |
| B. | proportional to 1/f |
| C. | proportional to f2 |
| D. | proportional to 1/f2 |
| Answer» C. proportional to f2 | |
| 3. |
What is the average degree of polymerization for a complete polycondensation reaction in a bifunctional system? |
| A. | infinity |
| B. | 0 |
| C. | 1 |
| D. | none of the mentioned |
| Answer» B. 0 | |
| 4. |
How does the reaction rate vary with increasing extent of reaction beyond 94% conversion in self catalyzed reaction? |
| A. | decreases |
| B. | increases |
| C. | remains same |
| D. | none of the mentioned |
| Answer» B. increases | |
| 5. |
WHAT_IS_THE_AVERAGE_DEGREE_OF_POLYMERIZATION_FOR_A_COMPLETE_POLYCONDENSATION_REACTION_IN_A_BIFUNCTIONAL_SYSTEM??$ |
| A. | infinity |
| B. | 0 |
| C. | 1 |
| D. | none of the mentioned |
| Answer» B. 0 | |
| 6. |
The average functionality of a polyfunctional system is 2.4. What will be the average degree of polymerization for 80% completion of reaction?$ |
| A. | 20.55 |
| B. | 27.67 |
| C. | 50.3 |
| D. | 2.97 |
| Answer» C. 50.3 | |
| 7. |
How_is_the_extent_of_reaction,_p,_of_a_polycondensation_reaction_related_to_the_average_functionality,_f,_of_the_system?$ |
| A. | proportional to f |
| B. | proportional to 1/f |
| C. | proportional to f<sup>2</sup> |
| D. | proportional to 1/f<sup>2</sup> |
| Answer» C. proportional to f<sup>2</sup> | |
| 8. |
What is true about an end functional group, having a terminal reactive centre, of a polymer molecule? |
| A. | has a greater mobility than the polymer molecule as a whole |
| B. | has a lower mobility than the polymer molecule as a whole |
| C. | same as polymer molecule |
| D. | cannot be determined |
| Answer» B. has a lower mobility than the polymer molecule as a whole | |
| 9. |
What factors may be responsible for deviation in the high conversion region of self-catalyzed polycondensation? |
| A. | loss of reactants |
| B. | cyclization |
| C. | other side reactions |
| D. | all of the mentioned |
| Answer» E. | |
| 10. |
What is the slope of the line plotted between square of the average degree of polymerization and time for a self catalyzed polyesterification? |
| A. | 2c<sub>0</sub><sup>2</sup>k |
| B. | 2c<sub>0</sub>k |
| C. | c<sub>0</sub>k/2 |
| D. | c<sub>0</sub><sup>2</sup>k |
| Answer» B. 2c<sub>0</sub>k | |
| 11. |
Which order kinetics does a strong acid catalyzed polyesterification reaction follow? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 12. |
Which of the following is true about polymer systems in polycondensation? |
| A. | have higher viscosity than small non-polymeric molecules |
| B. | insoluble beyond a critical molecular weight |
| C. | all of the mentioned |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 13. |
How is the reactivity of a specific functional group, in general, dependent on the size of the molecule to which it is attached, in a polycondensation reaction? |
| A. | increases with increase in molecular size |
| B. | decreases with decrease in molecular size |
| C. | independent of molecular size |
| D. | cannot be determined |
| Answer» D. cannot be determined | |
| 14. |
What is the order of a self-catalyzed polyesterification reaction? |
| A. | 2 |
| B. | 3 |
| C. | 1 |
| D. | 4 |
| Answer» C. 1 | |