MCQOPTIONS
Saved Bookmarks
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. |
Which material is made to react with polymer latex of polychloroprene to set a desired plasticity when modification with sulphur is done? |
| A. | tricresyl phosphate |
| B. | triethylthiuram sulphide |
| C. | tetraethylthiuram sulphide |
| D. | dioctyl phthalate |
| Answer» D. dioctyl phthalate | |
| 2. |
Which type polymerization is used to produce Polychloroprene commercially? |
| A. | solution polymerization |
| B. | bulk polymerization |
| C. | emulsion polymerization |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 3. |
What is the IUPAC name of the monomer of polychloroprene? |
| A. | 2-chloro-1,3-butadiene |
| B. | 3,4-dichlorobut-1-ene |
| C. | 1-chloro-1,3-butadiene |
| D. | none of the mentioned |
| Answer» B. 3,4-dichlorobut-1-ene | |
| 4. |
What is the correct order of the poor resilience characteristics in the given rubbers? |
| A. | NR>SBR>BR |
| B. | BR>NR>SBR |
| C. | SBR>BR>NR |
| D. | BR>SBR>NR |
| Answer» C. SBR>BR>NR | |
| 5. |
Which configuration of butadiene units is present in highest amount in SBR at 50 ᵒC? |
| A. | trans-1,4 |
| B. | cis-1,4 |
| C. | cis-1,2 |
| D. | all of the mentioned |
| Answer» B. cis-1,4 | |
| 6. |
Consider the following statements about emulsion SBR and solution SBR.I. Solution SBR has higher content of non-rubber materials than emulsion SBRII. Solution SBR has higher molecular weight but broader molecular weight distribution than emulsion SBRIII. Solution SBR has higher cis-1,4-polybutadiene content than emulsion SBRWhich of the following statements are true? |
| A. | I, II, III |
| B. | I, II |
| C. | III only |
| D. | I only |
| Answer» D. I only | |
| 7. |
WHAT_IS_THE_CORRECT_ORDER_OF_THE_POOR_RESILIENCE_CHARACTERISTICS_IN_THE_GIVEN_RUBBERS??$ |
| A. | NR>SBR>BR |
| B. | BR>NR>SBR |
| C. | SBR>BR>NR |
| D. | BR>SBR>NR |
| Answer» C. SBR>BR>NR | |
| 8. |
Which type polymerization is used to produce Polychloroprene commercially?$ |
| A. | solution polymerization |
| B. | bulk polymerization |
| C. | emulsion polymerization |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 9. |
What_is_the_IUPAC_name_of_the_monomer_of_polychloroprene?$ |
| A. | 2-chloro-1,3-butadiene |
| B. | 3,4-dichlorobut-1-ene |
| C. | 1-chloro-1,3-butadiene |
| D. | none of the mentioned |
| Answer» B. 3,4-dichlorobut-1-ene | |
| 10. |
Most filled technical Cr compounds show better resilience than NR of similar loading. State true or false. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 11. |
What is the average curing mixture for the vulcanization of Polychloroprene rubber (CR)? |
| A. | 5 parts ZnO and 4 parts MgO per 100 parts of neoprene |
| B. | 4 parts ZnO and 5 parts MgO per 100 parts of neoprene |
| C. | 8 parts sulphur per 100 parts of neoprene |
| D. | 10 parts sulphur per 100 parts of sulphur |
| Answer» B. 4 parts ZnO and 5 parts MgO per 100 parts of neoprene | |
| 12. |
Which of the following feature is responsible for the crystallizable nature of neoprene? |
| A. | 1,4-trans structure |
| B. | 1,4-cis structure |
| C. | all of the mentioned |
| D. | none of the mentioned |
| Answer» B. 1,4-cis structure | |
| 13. |
Which_material_is_made_to_react_with_polymer_latex_of_polychloroprene_to_set_a_desired_plasticity_when_modification_with_sulphur_is_done? |
| A. | tricresyl phosphate |
| B. | triethylthiuram sulphide |
| C. | tetraethylthiuram sulphide |
| D. | dioctyl phthalate |
| Answer» D. dioctyl phthalate | |
| 14. |
Which configuration of butadiene units is present in highest amount in SBR at 50 ᵒC?# |
| A. | trans-1,4 |
| B. | cis-1,4 |
| C. | cis-1,2 |
| D. | all of the mentioned |
| Answer» B. cis-1,4 | |
| 15. |
What are the temperature conditions for production of hot emulsion SBR and cold emulsion SBR, respectively? |
| A. | 50-60 ᵒC and 5 ᵒC |
| B. | 80-90 ᵒC and 5 ᵒC |
| C. | 50-60 ᵒC and 10 ᵒC |
| D. | 80-90 ᵒC and 10 ᵒC |
| Answer» B. 80-90 ¬¨‚à묨¬µ‚àö‚â†C and 5 ¬¨‚à묨¬µ‚àö‚â†C | |
| 16. |
Which synthetic rubbers are blended with BR to make its extensive use in tyres? |
| A. | NR and SBR |
| B. | NBR and SBR |
| C. | NR and NBR |
| D. | NR, NBR and SBR |
| Answer» B. NBR and SBR | |
| 17. |
Which of the following catalyst is used to obtain polybutadiene of cis content |
| A. | coordination catalyst based on Ni, Co |
| B. | redox catalyst |
| C. | zeiglar natta catalyst |
| D. | butyl lithium catalyst |
| Answer» E. | |
| 18. |
What is the cis content of polybutadiene rubber obtained by emulsion polymerization using redox catalyst? |
| A. | <40% |
| B. | >10% |
| C. | >92% |
| D. | None of the mentioned |
| Answer» C. >92% | |
| 19. |
What kind of synthetic rubbers are commonly known as thiokols? |
| A. | polyurethane rubbers |
| B. | polysulphide rubbers |
| C. | fluorocarbon rubbers |
| D. | polyacrylic rubbers |
| Answer» C. fluorocarbon rubbers | |
| 20. |
Which synthetic rubber is also commonly known as hypalon? |
| A. | polychloroprene rubber |
| B. | chloro-sulphonated polyethylene |
| C. | styrene-butadiene rubber |
| D. | nitrile rubber |
| Answer» C. styrene-butadiene rubber | |