MCQOPTIONS
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MCQOPTIONS
This section includes 20 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. |
What happens to the metal ion when it reacts with peroxide in a bimolecular initiator system? |
| A. | oxidizes |
| B. | reduces |
| C. | no change |
| D. | none of the mentioned |
| Answer» B. reduces | |
| 2. |
What is the radical produced by decomposition of persulfate ion? |
| A. | S∙O4– |
| B. | SO3∙ |
| C. | SO2 |
| D. | None of the mentioned |
| Answer» B. SO3∙ | |
| 3. |
Which molecule is released when AIBN is decomposed to give free radicals? |
| A. | N2 |
| B. | HCN |
| C. | NH3 |
| D. | None of the mentioned |
| Answer» B. HCN | |
| 4. |
What is the radical produced in the decomposition of acetyl peroxide? |
| A. | ∙CH3 |
| B. | ∙C2H5 |
| C. | CO2 |
| D. | None of the mentioned |
| Answer» B. ∙C2H5 | |
| 5. |
What has the initiator concentration in the expression for Rp, in bimolecular initiation system, been replaced by? |
| A. | reducing agent concentration |
| B. | oxidising agent concentration |
| C. | product of oxidizing and reducing agent concentration |
| D. | no change |
| Answer» D. no change | |
| 6. |
Which of the following is a mode for radicals to move out of the cage in decomposition mechanism of initiator? |
| A. | net diffusion of radicals produced |
| B. | release of a small molecule, formed by decomposition of radicals, followed by diffusion |
| C. | all of the mentioned |
| D. | none of the mentionedView Answer |
| Answer» D. none of the mentionedView Answer | |
| 7. |
WHAT_IS_THE_RADICAL_PRODUCED_IN_THE_DECOMPOSITION_OF_ACETYL_PEROXIDE??$ |
| A. | ‚àôCH<sub>3</sub> |
| B. | ‚àôC<sub>2</sub>H<sub>5</sub> |
| C. | CO<sub>2</sub> |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 8. |
What is the radical produced by decomposition of persulfate ion?$ |
| A. | S<sup>∙</sup>O<sub>4</sub><sup>–</sup> |
| B. | SO<sub>3</sub><sup>‚àô</sup> |
| C. | SO<sub>2</sub> |
| D. | None of the mentioned |
| Answer» B. SO<sub>3</sub><sup>‚Äö√Ñ√∂‚àö‚Ć‚àö¬•</sup> | |
| 9. |
Which_molecule_is_released_when_AIBN_is_decomposed_to_give_free_radicals?$ |
| A. | N<sub>2</sub> |
| B. | HCN |
| C. | NH<sub>3</sub> |
| D. | None of the mentioned |
| Answer» B. HCN | |
| 10. |
What happens to copper ion, when it gives out radicals in acidic medium? |
| A. | oxidizes |
| B. | reduces |
| C. | constant charge |
| D. | none of the mentioned |
| Answer» C. constant charge | |
| 11. |
What is the mechanism by which dithionite ion decomposes to give free radical? |
| A. | cleavage of S─O bond |
| B. | cleavage of S─S bond |
| C. | electron transfer |
| D. | cleavage of O─O bond |
| Answer» B. cleavage of S‚Äö√Ñ√∂‚àö√Ü‚àö√ëS bond | |
| 12. |
What_happens_to_the_metal_ion_when_it_reacts_with_peroxide_in_a_bimolecular_initiator_system? |
| A. | oxidizes |
| B. | reduces |
| C. | no change |
| D. | none of the mentioned |
| Answer» B. reduces | |
| 13. |
What has the initiator concentration in the expression for Rp, in bimolecular initiation system, been replaced by? |
| A. | reducing agent concentration |
| B. | oxidising agent concentration |
| C. | product of oxidizing and reducing agent concentration |
| D. | no change |
| Answer» C. product of oxidizing and reducing agent concentration | |
| 14. |
What is the color of the non-radical adduct formed, when the inhibitor diphenylpicrylhydrazyl reacts with other radicals? |
| A. | deep violet |
| B. | light brown yellow |
| C. | dark red |
| D. | black |
| Answer» B. light brown yellow | |
| 15. |
What is the mechanism of radical generation by bimolecular initiating systems? |
| A. | electron or charge transfer |
| B. | cleavage of bonds |
| C. | catalyzation |
| D. | all of the mentioned |
| Answer» E. | |
| 16. |
Which is the most useful approach for evaluating initiator efficiency? |
| A. | analysis of initiator fragments in polymer formed and comparing to initiator consumed |
| B. | measurement and comparison of polymer production and initiator decomposition |
| C. | use of inhibitors |
| D. | dead-end-effect in polymerization |
| Answer» D. dead-end-effect in polymerization | |
| 17. |
When should the measurement of the initiator decomposition be done? |
| A. | before polymerization |
| B. | after polymerization |
| C. | during polymerization |
| D. | independent of time |
| Answer» E. | |
| 18. |
Which of the following is required for determination of initiator efficiency, when the approach involves measurement and conversion of polymer production and initiator decomposition? |
| A. | number of polymer molecules formed |
| B. | number of radicals produced |
| C. | mode of termination |
| D. | all of the mentioned |
| Answer» B. number of radicals produced | |
| 19. |
How is the rate constant ratio kx/kD related to initiator efficiency? |
| A. | k<sub>x</sub>/k<sub>D</sub> = (1-f)/f |
| B. | k<sub>x</sub>/k<sub>D</sub> = f/(1-f) |
| C. | k<sub>x</sub>/k<sub>D</sub> = 1/(1-f) |
| D. | k<sub>x</sub>/k<sub>D</sub> = (1-f)/2f |
| Answer» E. | |
| 20. |
Which of the following factors does initiator efficiency depend on? |
| A. | initiator molecules |
| B. | polymerization condition |
| C. | solvent |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |