MCQOPTIONS
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MCQOPTIONS
This section includes 6 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 is the relative rate of polymerization, under steady conditions to that of slow blinking, when the dark period is 4 times longer than the light period? |
| A. | t1/4 |
| B. | t1/5 |
| C. | t1/5<sup>1/2</sup> |
| D. | t1/2 |
| Answer» C. t1/5<sup>1/2</sup> | |
| 2. |
Which of the following is correct regarding the proportionality of average rate for intensity of illumination, if there is very fast blinking with equal light and dark periods? |
| A. | t( R<sub>p</sub>) (I<sub>0</sub>)<sup>1/2</sup> |
| B. | t( R<sub>p</sub>) (I<sub>0</sub>/2)<sup>1/2</sup> |
| C. | t( R<sub>p</sub>) (I<sub>0</sub>)<sup>1/2</sup> |
| D. | t( R<sub>p</sub>) 2(I<sub>0</sub>)<sup>1/2</sup> |
| Answer» C. t( R<sub>p</sub>) (I<sub>0</sub>)<sup>1/2</sup> | |
| 3. |
What is the proportionality order for the average rate of polymerization for steady conditions and continuous illumination, with respect to intensity of illumination? |
| A. | t |
| B. | t1 |
| C. | t- |
| D. | t-1 |
| Answer» B. t1 | |
| 4. |
Which of the following cannot affect the average lifetime of a radical in a photo-initiated polymerization? |
| A. | trate of polymerization, R<sub>p</sub> |
| B. | tfrequency of light radiations |
| C. | tintensity of light radiations |
| D. | tnone of the mentioned |
| Answer» E. | |
| 5. |
What is the intensity received by the system in rotating sector technique, under the limiting case of very fast flashing? |
| A. | tI<sub>0</sub> |
| B. | tI<sub>0</sub>/2 |
| C. | t2I<sub>0</sub> |
| D. | t3I<sub>0</sub> |
| Answer» C. t2I<sub>0</sub> | |
| 6. |
How is the average lifetime of a growing radical, under steady state, in a radical polymerization, defined? |
| A. | tratio of the steady state radical concentration and the rate of its termination |
| B. | tratio of termination of the radical and its steady state concentration |
| C. | tratio of steady state radical concentration and the rate of propagation |
| D. | tcannot be determined |
| Answer» B. tratio of termination of the radical and its steady state concentration | |