MCQOPTIONS
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MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Phase Transformation knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The structure of interface plays a key role in determining its energy. Which among the energy considerations play a major role when their sizes are large and small respectively? |
| A. | Interfacial and elastic |
| B. | Elastic and interfacial |
| C. | Interfacial in both cases |
| D. | Elastic in both cases |
| Answer» C. Interfacial in both cases | |
| 2. |
Generic high angle grain boundaries are typically___________ |
| A. | Coherent interface |
| B. | Semi coherent interface |
| C. | Incoherent interface |
| D. | Mixed interface |
| Answer» D. Mixed interface | |
| 3. |
If the surface area of the large particle remains unchanged the increase in free energy will be due to the____ |
| A. | Motion of spherical particle |
| B. | Vibration of spherical particle |
| C. | Increase in the interfacial area of the spherical particle |
| D. | Decrease in the interfacial area of the spherical particle |
| Answer» D. Decrease in the interfacial area of the spherical particle | |
| 4. |
The free energy increase due to interfacial energy is known as_____ |
| A. | Gibbs-Thomson effect |
| B. | Perkins effect |
| C. | Nano effect |
| D. | Hauls effect |
| Answer» B. Perkins effect | |
| 5. |
MnS in steel is an example of _____ |
| A. | Coherent interface |
| B. | Semi coherent interface |
| C. | Incoherent interface |
| D. | Mixed interface |
| Answer» D. Mixed interface | |
| 6. |
There is an increase in free energy due to interfacial energy is known as a capillarity effect or the Gibbs-Thomson effect. Find the increase in this free energy if the interfacial energy, the molar volume and the radius of the spherical particle are given as 10 (kJ/mm2), 6mm3/mol and 4mm respectively? |
| A. | 40 kJmol<sup>-1</sup> |
| B. | 30 kJmol<sup>-1</sup> |
| C. | 50 kJmol<sup>-1</sup> |
| D. | 60 kJmol<sup>-1</sup> |
| Answer» C. 50 kJmol<sup>-1</sup> | |
| 7. |
If the / ( , are phases) interfacial energy is given as 10N/mm and the particles are spherical with a radius 2.5mm, P (extra pressure due to curvature of / ) is given approximately by_________ |
| A. | 8 N/mm<sup>2</sup> |
| B. | 4 N/mm<sup>2</sup> |
| C. | 3 N/mm<sup>2</sup> |
| D. | 2 N/mm<sup>2</sup> |
| Answer» B. 4 N/mm<sup>2</sup> | |
| 8. |
For a particular or given diffusion coefficient, which among the following interface moves the slowest? |
| A. | Coherent |
| B. | Semi coherent |
| C. | Incoherent |
| D. | Mixed |
| Answer» B. Semi coherent | |
| 9. |
Solidification front is an example of_________ |
| A. | Solid-Vapor interface |
| B. | Solid-Liquid interface |
| C. | Solid-Solid interface |
| D. | Liquid-Liquid interface |
| Answer» C. Solid-Solid interface | |
| 10. |
Grain boundaries are an example of a_________ |
| A. | Solid-Vapor interface |
| B. | Solid-Liquid interface |
| C. | Solid-Solid interface |
| D. | Liquid-Liquid interface |
| Answer» D. Liquid-Liquid interface | |
| 11. |
The surface of a single crystal (of a pure element) is an example of a_________ |
| A. | Solid-Vapor interface |
| B. | Solid-Liquid interface |
| C. | Solid-Solid interface |
| D. | Liquid-Liquid interface |
| Answer» B. Solid-Liquid interface | |