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. |
In case of point defect in polymers probability of which part of the polymer is likely to be defected more compared to other? |
| A. | Center of polymer chain |
| B. | Chain ends |
| C. | Main chain units |
| D. | Starting part of chain |
| Answer» C. Main chain units | |
| 2. |
Which of the following oxides are highly defective? |
| A. | Al<sub>2</sub>O<sub>3</sub> |
| B. | MgO |
| C. | CaO |
| D. | FeO |
| Answer» E. | |
| 3. |
Which of the following phenomenon creates point defect in ceramics? |
| A. | Thermal excitation |
| B. | Precipitation |
| C. | Densification |
| D. | Electrical conductivity |
| Answer» B. Precipitation | |
| 4. |
In which type of defect smaller cation can get displaced into an interstitial void? |
| A. | Schottky defect |
| B. | Intrinsic defect |
| C. | Extrinsic defect |
| D. | Frankel defect |
| Answer» E. | |
| 5. |
How is the concentration of defect related with free energy? |
| A. | The concentration of defect increases free energy |
| B. | The concentration of defect decrease free energy |
| C. | The concentration of defect is equal to free energy |
| D. | The concentration of defect is not related to free energy |
| Answer» B. The concentration of defect decrease free energy | |
| 6. |
Which of the following is not the feature of solute and solvent atoms that determine the degree to which former dissolve in latter? |
| A. | Corrosion factor |
| B. | Atomic size factor |
| C. | Crystal structure |
| D. | Valences |
| Answer» B. Atomic size factor | |
| 7. |
Calculate temperature of copper at which equilibrium number of vacancies per cubic meter is 2.2*1020 vacancies/m3. The energy of vacancy formation is 0.7ev/atom and total number of atom is 2*1030atom/m3. |
| A. | 3541.4k |
| B. | 300k |
| C. | 354.14k |
| D. | 2.82*10-3k |
| Answer» D. 2.82*10-3k | |
| 8. |
Which of the following technique is not used to measure the concentration of vacancy to determine the activation energy for its formation? |
| A. | Positron annihilation technique |
| B. | Thermal expansion measurements |
| C. | Measuring resistivity after quenching |
| D. | Thermal imaging |
| Answer» E. | |
| 9. |
Which type of diffusion occurs due to the exchange of an atom with vacancies? |
| A. | Substitution diffusion |
| B. | Elimination diffusion |
| C. | Passive diffusion |
| D. | Facilated diffusion |
| Answer» B. Elimination diffusion | |
| 10. |
Which thermodynamic property increases in a crystalline solid due to the presence of vacancies? |
| A. | Enthalpy |
| B. | Entropy |
| C. | Internal energy |
| D. | Work done |
| Answer» C. Internal energy | |