MCQOPTIONS
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MCQOPTIONS
This section includes 38 Mcqs, each offering curated multiple-choice questions to sharpen your Applied Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following information about chlorinated rubber is wrong? |
| A. | it resists concentrated nitric acid |
| B. | it is used as heat sealable package for dry food |
| C. | it has flame retardant characteristics |
| D. | it is resinous in character |
| Answer» C. it has flame retardant characteristics | |
| 2. |
Which solvent is used to dissolve rubber pieces in the process of chlorination of natural rubber? |
| A. | carbon tetrachloride |
| B. | acetone |
| C. | benzene |
| D. | toluene |
| Answer» B. acetone | |
| 3. |
What kind of product is obtained on chlorination of natural rubber? |
| A. | elastomer |
| B. | thermoplastic |
| C. | resinous |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 4. |
Consider the following statements about hydrocarbons of natural rubber and gutta percha.I. They have same elementary formula.II. They have same molecular weight.III. Rubber hydrocarbon has low specific gravity than gutta percha.Which of the following statements are true? |
| A. | I, III |
| B. | I, II, III |
| C. | II, III |
| D. | I only |
| Answer» B. I, II, III | |
| 5. |
Which substance is added to the dilute latex to prevent darkening of latex? |
| A. | sodium bisulfite |
| B. | potassium sulfite |
| C. | sodium sulfate |
| D. | potassium sulfate |
| Answer» B. potassium sulfite | |
| 6. |
Which tree gives out the latex to obtain natural rubber? |
| A. | eucalyptus |
| B. | hevea brasiliensis |
| C. | anogeissus |
| D. | astragalus |
| Answer» C. anogeissus | |
| 7. |
While producing the smoked rubber, the sheets are hanged for about _________ in smoked chambers. |
| A. | 1 day |
| B. | 2 days |
| C. | 3 days |
| D. | 4 days |
| Answer» E. | |
| 8. |
While producing smoked rubber, the latex and reacted with formic acid, the vertical partition plates are inserted and left undisturbed for _________ |
| A. | 13 hours |
| B. | 14 hours |
| C. | 15 hours |
| D. | 16 hours |
| Answer» E. | |
| 9. |
While producing the smoked rubber, the filtered latex is fed into long rectangular tanks of _________ deep. |
| A. | 1m |
| B. | 2m |
| C. | 50cm |
| D. | 30cm |
| Answer» E. | |
| 10. |
While producing the crepe rubber, the coagulam is passed between two rollers of about _________ wide. |
| A. | 3mm |
| B. | 4mm |
| C. | 50cm |
| D. | 100cm |
| Answer» D. 100cm | |
| 11. |
The rubber coagulates into soft _________ colour mass. |
| A. | Yellow |
| B. | Light yellow |
| C. | White |
| D. | Light pink |
| Answer» D. Light pink | |
| 12. |
The elasticity of the rubber is due to its ___________ |
| A. | Trigonal planar |
| B. | Octahedral |
| C. | Pentagonal bipyramidal |
| D. | Helix |
| Answer» E. | |
| 13. |
The temporary deformation of rubber takes place after applying the _______ stress. |
| A. | 600e.u |
| B. | More than 600e.u |
| C. | 500e.u |
| D. | more than 500e.u |
| Answer» C. 500e.u | |
| 14. |
WHAT_KIND_OF_PRODUCT_IS_OBTAINED_ON_CHLORINATION_OF_NATURAL_RUBBER??$ |
| A. | elastomer |
| B. | thermoplastic |
| C. | resinous |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 15. |
WHILE_PRODUCING_THE_CREPE_RUBBER,_THE_COAGULAM_IS_PASSED_BETWEEN_TWO_ROLLERS_OF_ABOUT___________WIDE.?$ |
| A. | 3mm |
| B. | 4mm |
| C. | 50cm |
| D. | 100cm |
| Answer» D. 100cm | |
| 16. |
Which of the following information about chlorinated rubber is wrong?$ |
| A. | it resists concentrated nitric acid |
| B. | it is used as heat sealable package for dry food |
| C. | it has flame retardant characteristics |
| D. | it is resinous in character |
| Answer» C. it has flame retardant characteristics | |
| 17. |
While producing smoked rubber, the latex and reacted with formic acid, the vertical partition plates are inserted and left undisturbed for _________ |
| A. | 13 hours |
| B. | 14 hours |
| C. | 15 hours |
| D. | 16 hours |
| Answer» E. | |
| 18. |
Which_solvent_is_used_to_dissolve_rubber_pieces_in_the_process_of_chlorination_of_natural_rubber?$ |
| A. | carbon tetrachloride |
| B. | acetone |
| C. | benzene |
| D. | toluene |
| Answer» B. acetone | |
| 19. |
While_producing_the_smoked_rubber,_the_filtered_latex_is_fed_into_long_rectangular_tanks_of___________deep.$ |
| A. | 1m |
| B. | 2m |
| C. | 50cm |
| D. | 30cm |
| Answer» E. | |
| 20. |
In solvent extraction process, the mature leaves are grounded and heated about _________ |
| A. | 40<sup>o</sup>C |
| B. | 50<sup>o</sup>C |
| C. | 60<sup>o</sup>C |
| D. | 70<sup>o</sup>C |
| Answer» E. | |
| 21. |
Solvent extraction process is used to extract __________ |
| A. | Crepe rubber |
| B. | Smoked rubber |
| C. | Gutta percha |
| D. | Guayule rubber |
| Answer» D. Guayule rubber | |
| 22. |
To produce the smoked rubber, the rubber sheets are hanged in smoked chambers at __________ |
| A. | 10-20<sup>o</sup>C |
| B. | 20-30<sup>o</sup>C |
| C. | 30-40<sup>o</sup>C |
| D. | 40-50<sup>o</sup>C |
| Answer» E. | |
| 23. |
Which solution is used for hydrochlorination of natural rubber with HCl gas? |
| A. | benzene |
| B. | toluene |
| C. | carbon tetrachloride |
| D. | acetone |
| Answer» B. toluene | |
| 24. |
While_producing_the_smoked_rubber,_the_sheets_are_hanged_for_about___________in_smoked_chambers. |
| A. | 1day |
| B. | 2 days |
| C. | 3 days |
| D. | 4 days |
| Answer» E. | |
| 25. |
How much would the unsaturation of cyclized rubber reduce to its original when it forms polycyclic structure? |
| A. | 57-60% |
| B. | 20-30% |
| C. | 40% |
| D. | 70% |
| Answer» C. 40% | |
| 26. |
The rubber coagulates into soft _________ colour mass? |
| A. | Yellow |
| B. | Light yellow |
| C. | White |
| D. | Light pink |
| Answer» D. Light pink | |
| 27. |
What are the temperature and pressure conditions when natural rubber is hydrogenated in the presence of nickel catalyst? |
| A. | 5-10 atm and 180-200 ᵒC |
| B. | 15-20 atm and 180-200 ᵒC |
| C. | 30-35 atm and 100-120 ᵒC |
| D. | 15-20 atm and 100-120 ᵒC |
| Answer» C. 30-35 atm and 100-120 ¬¨‚à묨¬µ‚àö‚â†C | |
| 28. |
The filtered latex is sent into the tanks and treated with __________ |
| A. | Acetic acid |
| B. | Formaldehyde |
| C. | Acetaldehyde |
| D. | Poly isoprene |
| Answer» B. Formaldehyde | |
| 29. |
What are the sequential processes through which rubber latex undergo to give natural rubber? |
| A. | tapping-preservation-coagulation |
| B. | preservation-tapping-coagulation |
| C. | tapping-coagulation-preservation |
| D. | coagulation-tapping-preservation |
| Answer» B. preservation-tapping-coagulation | |
| 30. |
The latex is diluted to _________ and filtered to remove suspended impurities. |
| A. | 5-10% |
| B. | 10-15% |
| C. | 15-20% |
| D. | 20-25% |
| Answer» D. 20-25% | |
| 31. |
Cis-poly isoprene is present in ________ |
| A. | Hevea rubber |
| B. | Guayule rubber |
| C. | Percha rubber |
| D. | Gutta rubber |
| Answer» B. Guayule rubber | |
| 32. |
Which of the following represents natural rubber chemically? |
| A. | cis 1,4-polyisoprene |
| B. | trans 1,4-polyisoprene |
| C. | cis 1,3-polyisoprene |
| D. | trans 1,3-polyisoprene |
| Answer» B. trans 1,4-polyisoprene | |
| 33. |
Isoprene in natural rubber exists in ___________ geometrical isomeric forms. |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» B. 3 | |
| 34. |
Which component has the maximum composition in the Hevea rubber latex? |
| A. | rubber hydrocarbon |
| B. | water |
| C. | proteins |
| D. | sugars |
| Answer» C. proteins | |
| 35. |
The elasticity of the rubber is due to its ___________ |
| A. | Trigonal planar |
| B. | Octahedral |
| C. | Pentagonal bipyramidal |
| D. | Helix |
| Answer» E. | |
| 36. |
Which substance is added to the dilute latex to prevent darkening of latex? |
| A. | sodium bisulfite |
| B. | potassium sulfite |
| C. | sodium sulfate |
| D. | potassium sulfate |
| Answer» B. potassium sulfite | |
| 37. |
The temporary deformation of rubber take place after applying the _______ stress. |
| A. | 600e.u |
| B. | More than 600e.u |
| C. | 500e.u |
| D. | more than 500e.u |
| Answer» C. 500e.u | |
| 38. |
The polymers which possess the property of elastic is called rubber. |
| A. | True |
| B. | False |
| Answer» B. False | |