MCQOPTIONS
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MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The percentage of butadiene and styrene in Buna-S is ____________ |
| A. | 50% each |
| B. | 60% and 40% respectively |
| C. | 80% and 20% respectively |
| D. | 75% and 25% respectively |
| Answer» E. | |
| 2. |
The tensile strength(kg/cm 2) of vulcanised rubber is ____________ |
| A. | 200 |
| B. | 2000 |
| C. | 500 |
| D. | 5000 |
| Answer» C. 500 | |
| 3. |
The amount of sulphur added determines the extent of stiffness of vulcanised rubber. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
In the vulcanisation process, the raw rubber is heated with ____________ |
| A. | Oxygen |
| B. | Sulphur |
| C. | Carbon |
| D. | Calcium |
| Answer» C. Carbon | |
| 5. |
The temperature at which raw rubber is heated for the vulcanisation process is ____________ |
| A. | 0-10 0C |
| B. | 10-50 0C |
| C. | 50-100 0C |
| D. | 100-140 0C |
| Answer» E. | |
| 6. |
The structural formula of isoprene is ____________ |
| A. | 2-benzyl-1,3-butadiene |
| B. | 2-methyl-1,3-butadiene |
| C. | 3-benzyl-1,2-butadiene |
| D. | 3-methyl-1,2-butadiene |
| Answer» C. 3-benzyl-1,2-butadiene | |
| 7. |
Natural rubber is ____________ |
| A. | Poly isoprene |
| B. | Ethylene glycol |
| C. | Butadiene |
| D. | Acrylonitrile |
| Answer» B. Ethylene glycol | |
| 8. |
Which of the following is not the essential structural requirement of an elastomer? |
| A. | Long flexible chains |
| B. | Weak intermolecular forces |
| C. | Rigidity in structure |
| D. | Occasional cross-linking |
| Answer» D. Occasional cross-linking | |