MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 9 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. |
Which of the following structure is stable at low temperature? |
| A. | -TI with BCC structure |
| B. | -TI with HCP structure |
| C. | -TI with BCC structure |
| D. | -TI with HCP structure |
| Answer» E. | |
| 2. |
What happens to the internal energy of a system with constant volume and constant entropy during a spontaneous process? |
| A. | Increases first then decreases |
| B. | Decreases |
| C. | Remains same |
| D. | Increases |
| Answer» C. Remains same | |
| 3. |
The enthalpy of a phase which is stable at higher temperature is higher (less negative) than that of a phase which is stable at lower temperature. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
Which rule states that the entropy of fusion is a constant ==<R (8.3 J mol-1 K-1) for most metals? |
| A. | Richards rule |
| B. | Stefan s Rule |
| C. | Charles law |
| D. | Fermat s rule |
| Answer» B. Stefan s Rule | |
| 5. |
A liquid metal is undercooled by T below Tm before it solidifies, solidification will be accompanied by _____ |
| A. | A constant free energy |
| B. | An increase in free energy |
| C. | A decrease in free energy |
| D. | G=0 |
| Answer» D. G=0 | |
| 6. |
Which of the following is a spontaneous exothermic process? |
| A. | Rusting |
| B. | Ice melting |
| C. | Removal of sugar from the coffee |
| D. | Dissolution of sand in water |
| Answer» B. Ice melting | |
| 7. |
Iron exist as BCC ferrite at temperature____________ |
| A. | Above 910 degree Celsius |
| B. | Below 910 degree Celsius |
| C. | Below 1000 degree Celsius |
| D. | Above 1000 degree Celsius |
| Answer» C. Below 1000 degree Celsius | |
| 8. |
At all temperatures the liquid has a higher enthalpy than solid. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
Reason why in many metals, we find the phase with a relatively closely packed structure is stable at a lower temperature, whereas a relatively loosely packed structure is stable at higher temperature? |
| A. | Enthalpy |
| B. | Volume |
| C. | Entropy term |
| D. | Temperature |
| Answer» D. Temperature | |