MCQOPTIONS
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MCQOPTIONS
This section includes 9 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 ratio of degree of polymerization for a polymer when terminated by combination to disproportionation mechanism? |
| A. | t2 |
| B. | t0.5 |
| C. | t1 |
| D. | t4 |
| Answer» B. t0.5 | |
| 2. |
For styrene polymerized at 70 C, monomer concentration is 7.85mol/l and the value of the ratio (kp2/kt) is 0.0015 l/mol-s. What is the rate of polymerization reaction, if the chain length is 300? |
| A. | t0.092 |
| B. | t0.046 |
| C. | t0.08 |
| D. | t0.072 |
| Answer» C. t0.08 | |
| 3. |
What is the degree of polymerization for polyvinyl chloride, having kinetic chain length as 400 and terminated by coupling mechanism? |
| A. | t400 |
| B. | t800 |
| C. | t200 |
| D. | tnone of the mentioned |
| Answer» C. t200 | |
| 4. |
What are the relative chain lengths of vinyl chloride and styrene, polymerized at 60 C, having the values of ratio kp2/kt as 0.126 l/mol-s and 0.0034 l/mol-s, respectively? |
| A. | t37 |
| B. | t74 |
| C. | t50 |
| D. | t100 |
| Answer» B. t74 | |
| 5. |
For vinyl acetate polymerized at 50 C, the value of the ratio kp2/kt is 0.0138 l/mol-s. What is the value of chain length, when monomer concentration is 6.53 mol/l and rate of polymerization is 2.0*10-4mol/l-s? |
| A. | t1471 |
| B. | t2942 |
| C. | t2500 |
| D. | t225 |
| Answer» B. t2942 | |
| 6. |
The kinetic chain length expression given by, v=( kp2/2kt)([M]2/Rp) is applicable to all cases of termination, irrespective of the mechanism involved. State true or false. |
| A. | ttrue |
| B. | tfalse |
| Answer» B. tfalse | |
| 7. |
What is the expression for kinetic chain length for a purely thermal polymerization? |
| A. | tk<sub>p</sub>/2(k<sub>i</sub>k<sub>t</sub>)<sup>0.5</sup> |
| B. | tk<sub>p</sub>/2(k<sub>i</sub>/k<sub>t</sub>)<sup>0.5</sup> |
| C. | tk<sub>p</sub><sup>2</sup>/2(k<sub>i</sub>k<sub>t</sub>)<sup>0.5</sup> |
| D. | tk<sub>p</sub>/(k<sub>i</sub>k<sub>t</sub>)<sup>0.5</sup> |
| Answer» B. tk<sub>p</sub>/2(k<sub>i</sub>/k<sub>t</sub>)<sup>0.5</sup> | |
| 8. |
The kinetic chain length represents the average number of monomer molecules in a polymer molecule. State true or false. |
| A. | ttrue |
| B. | tfalse |
| Answer» C. | |
| 9. |
What does the ratio Rp/Ri represent in polymerization? |
| A. | tchain length |
| B. | tmonomer concentration |
| C. | tinitiator concentration |
| D. | tnone of the mentioned |
| Answer» B. tmonomer concentration | |