MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 17 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. |
BF3 is ineffective to induce cationic polymerization in isobutylene when the reactants are moisture free. State true or false. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 2. |
The magnitude of the negative activation energy for degree of polymerization is higher for true termination than that for the termination by transfer reactions. State true or false. |
| A. | true |
| B. | false |
| Answer» C. | |
| 3. |
What is the range of activation energy of overall polymerization of cationic polymerization? |
| A. | -10 to +10 kcal/mol |
| B. | -100 to +100 kcal/mol |
| C. | -500 to +500 kcal/mol |
| D. | -25 to +25 kcal/mol |
| Answer» B. -100 to +100 kcal/mol | |
| 4. |
What does the binding energy between the propagating ion and the gegen ion depend on? |
| A. | nature of reaction media |
| B. | nature of gegen ion |
| C. | temperature of reaction |
| D. | all of the mentioned |
| Answer» E. | |
| 5. |
WHAT_DOES_THE_BINDING_ENERGY_BETWEEN_THE_PROPAGATING_ION_AND_THE_GEGEN_ION_DEPEND_ON??$ |
| A. | nature of reaction media |
| B. | nature of gegen ion |
| C. | temperature of reaction |
| D. | all of the mentioned |
| Answer» E. | |
| 6. |
The magnitude of the negative activation energy for degree of polymerization is higher for true termination than that for the termination by transfer reactions. State true or false.$ |
| A. | true |
| B. | false |
| Answer» C. | |
| 7. |
What is the range of activation energy of overall polymerization of cationic polymerization?$ |
| A. | -10 to +10 kcal/mol |
| B. | -100 to +100 kcal/mol |
| C. | -500 to +500 kcal/mol |
| D. | -25 to +25 kcal/mol |
| Answer» B. -100 to +100 kcal/mol | |
| 8. |
How is the rate of cationic polymerization reaction affected with the increase in the dielectric constant of the reaction medium? |
| A. | increase |
| B. | decreases |
| C. | may increase or decrease |
| D. | no effect |
| Answer» B. decreases | |
| 9. |
BF3 is ineffective to induce cationic polymerization in isobutylene when the reactants are moisture free. State true or false. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 10. |
What is true about the degree of cationic polymerization when termination occurs by monomer transfer? |
| A. | constant |
| B. | proportional to monomer concentration |
| C. | proportional to catalyst concentration |
| D. | proportional to square of monomer concentration |
| Answer» B. proportional to monomer concentration | |
| 11. |
How is the rate of polymerization dependent on the concentration of catalyst in cationic polymerization? |
| A. | proportional to first power |
| B. | proportional to half power |
| C. | proportional to second power |
| D. | no dependence |
| Answer» B. proportional to half power | |
| 12. |
How does degree of polymerization affected with increase in temperature of cationic polymerization reaction? |
| A. | increases |
| B. | decreases |
| C. | no change |
| D. | cannot be determined |
| Answer» C. no change | |
| 13. |
What kind of substituent groups should be attached to the monomer, readily undergoing cationic polymerization? |
| A. | electron accepting |
| B. | electron releasing |
| C. | all of the mentioned |
| D. | none of the mentioned |
| Answer» C. all of the mentioned | |
| 14. |
Which of the following monomer has highest reactivity towards cationic polymerization? |
| A. | isobutylene |
| B. | isoprene |
| C. | vinyl ethers |
| D. | styrene |
| Answer» D. styrene | |
| 15. |
Which of the following nature of solvent or additives can inhibit the growth in cationic polymerization? |
| A. | basic |
| B. | acidic |
| C. | neutral |
| D. | none of the mentioned |
| Answer» B. acidic | |
| 16. |
Which of the following type of termination is not possible in ionic polymerization? |
| A. | bimolecular termination |
| B. | unimolecular termination |
| C. | termination through transfer to monomer or solvent |
| D. | none of the mentioned |
| Answer» B. unimolecular termination | |
| 17. |
Which of the following polymerization mechanism can polymerize the styrene monomer? |
| A. | cationic polymerization |
| B. | radical polymerization |
| C. | anionic polymerization |
| D. | all of the mentioned |
| Answer» E. | |