MCQOPTIONS
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MCQOPTIONS
This section includes 10 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. |
In a cooling curve, the invariant reaction is represented by ______ |
| A. | Thermal arrest |
| B. | Vertical arrest |
| C. | Horizontal arrest |
| D. | Slope |
| Answer» D. Slope | |
| 2. |
What causes the increase in thermal entropy due to the vacancies present in the site? |
| A. | Collision of the adjacent atoms |
| B. | Extra freedom of vibration |
| C. | Due to restriction in motion |
| D. | Due to close packing of remaining atoms |
| Answer» C. Due to restriction in motion | |
| 3. |
What happens to the configurational entropy when atoms are moved from their respective sites? |
| A. | Remains constant |
| B. | Decreases |
| C. | Increases |
| D. | Become zero |
| Answer» D. Become zero | |
| 4. |
What happens to the internal energy when atoms are moved from their respective sites? |
| A. | Internal energy remains constant |
| B. | Internal energy increases |
| C. | Internal energy decreases first then increases |
| D. | Internal energy decreases |
| Answer» C. Internal energy decreases first then increases | |
| 5. |
The equations for free energy and chemical potential can be used to derive the effect of temperature on the limits of solid solubility in a terminal solid solution. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
According to Gibbs rule the number of phases (P) present in a system in equilibrium is given as_________ |
| A. | P=C+N-F |
| B. | P=C+F-N |
| C. | P=F+N-C |
| D. | P=C+N+F |
| Answer» B. P=C+F-N | |
| 7. |
The stable composition range of the phase in the phase diagram need not include the composition with the minimum free energy, but is determined by _____ |
| A. | Relative free energy of adjacent phases |
| B. | Enthalpy of phases |
| C. | Free energy of stable phase |
| D. | Relative enthalpy of adjacent phases |
| Answer» B. Enthalpy of phases | |
| 8. |
What happens when the the atoms in the alloy repel each other making the disruption of the solid into a liquid phase possible at lower temperatures than in either pure A or pure B? |
| A. | Alloys melt at temperature below melting point |
| B. | Alloys melt at temperature above melting point |
| C. | Alloys melt at room temperature |
| D. | Alloys solidify |
| Answer» B. Alloys melt at temperature above melting point | |
| 9. |
Enthalpy of mixing is negative, for such systems melting will be more difficult in the alloys and a maximum melting point mixture may appear. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
Which among the following condition about a simple binary system is not a part of Hume- Rothery rule? |
| A. | Same crystal structure |
| B. | Size difference is less than 15 |
| C. | Electronegativity s have similar values |
| D. | Composition should be almost similar |
| Answer» E. | |