MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Materials Science knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is false for grain growth? |
| A. | The grains start growing |
| B. | Grain growth accelerates with increase in temperature |
| C. | Decrease in free energy |
| D. | Increase of surface energy |
| Answer» E. | |
| 2. |
Lowest temperature for recrystallization for iron is 270 C |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
Which of the following processes can be used to refine the grain structure? |
| A. | Recovery |
| B. | Recrystallization |
| C. | Grain growth |
| D. | Such a process does not exist. |
| Answer» C. Grain growth | |
| 4. |
In which of the following metal polygonization rarely takes place? |
| A. | Copper |
| B. | Iron |
| C. | Aluminium |
| D. | Molybdenum |
| Answer» B. Iron | |
| 5. |
By what percentage can the hardness decrease after strain-relief crystallization? |
| A. | 12% |
| B. | 5% |
| C. | 8% |
| D. | 17% |
| Answer» B. 5% | |
| 6. |
Which of the following statements are false in strain-relief crystallization? |
| A. | Dislocation climb |
| B. | Decrease in the electric resistance |
| C. | Increase in density |
| D. | Interaction of like signed dislocation |
| Answer» E. | |
| 7. |
Strain-relief crystallization takes place when deformed metals are heated. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
At which of the following temperature can recovery occur? (where Tm is melting point) |
| A. | 0.2Tm |
| B. | 0.4Tm |
| C. | 0.5Tm |
| D. | 0.6Tm |
| Answer» B. 0.4Tm | |
| 9. |
When a material is plastically deformed at low temperature(around 25 degrees) relative to the melting temperature, which of the following change isn t observed? |
| A. | Change in grain shape |
| B. | Strain hardening |
| C. | Decrease in dislocation density |
| D. | Increase in dislocation density |
| Answer» D. Increase in dislocation density | |
| 10. |
In which of the following processes does recovery, recrystallization, grain growth take place? |
| A. | Surface hardening |
| B. | Tempering |
| C. | Strengthening |
| D. | Annealing |
| Answer» E. | |