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. |
Two crystal structures are in equilibrium and their Gibbs energies are the same. Thus, the driving force for the transformation is_________ |
| A. | Less than zero |
| B. | Zero |
| C. | Greater than Zero |
| D. | One |
| Answer» C. Greater than Zero | |
| 2. |
What happens to the entropy in a system with constant volume and constant internal energy during a spontaneous process? |
| A. | Remains same |
| B. | Decreases |
| C. | Increases |
| D. | First decreases then increases |
| Answer» C. Increases | |
| 3. |
The quantum of energy in an elastic wave is called a ___________ |
| A. | Debye model |
| B. | Sonar |
| C. | Phonon |
| D. | Photon |
| Answer» D. Photon | |
| 4. |
Graphite and diamond at room temperature and pressure are examples of _____________ |
| A. | Unstable and stable equilibrium states |
| B. | Stable and unstable equilibrium states |
| C. | Metastable and stable equilibrium states |
| D. | Stable and metastable equilibrium states |
| Answer» E. | |
| 5. |
When the system is at local equilibrium, its Gibbs free energy (G) function has reached its minimum value. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
Which of the thermodynamic functions can be considered as an intensive property? |
| A. | Volume |
| B. | Pressure |
| C. | Enthalpy |
| D. | Entropy |
| Answer» C. Enthalpy | |
| 7. |
Which of the following is a necessary criterion for any transformation (G1, G2 are the free energies of initial and final state respectively)? |
| A. | G2-G1<0 |
| B. | G1=G2 |
| C. | G2>G1 |
| D. | G2=0 |
| Answer» B. G1=G2 | |
| 8. |
Solid phases are most stable at low temperatures. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
Based on the Gibbs phase rule, how many degrees of freedom are present at the triple point of water? |
| A. | 1 |
| B. | 2 |
| C. | 0 |
| D. | 3 |
| Answer» D. 3 | |
| 10. |
The relative stability of a system for transformations that occur at constant temperature and pressure is determined by its ____________ |
| A. | Exergy |
| B. | Helmholtz free energy |
| C. | Entropy |
| D. | Gibbs free energy |
| Answer» E. | |