MCQOPTIONS
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MCQOPTIONS
This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Behaviour knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Stacking fault energy of silver is _____ |
| A. | 40 – 50 mJm-2 |
| B. | 70 – 80 mJm-2 |
| C. | 10 – 20 mJm-2 |
| D. | 20 – 30 mJm-2 |
| Answer» E. | |
| 2. |
What is the stacking sequence for FCC structure? |
| A. | ABABAB |
| B. | ABCABC |
| C. | AAA |
| D. | ABCDABCD |
| Answer» C. AAA | |
| 3. |
High angle grain boundaries provide easy atom diffusion in a solid state. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
A low angle grain boundary, formed by set of _______ dislocations, is defined as twist boundary. |
| A. | Edge |
| B. | Mixed |
| C. | Screw |
| D. | Taylor |
| Answer» D. Taylor | |
| 5. |
A low angle grain boundary formed by an array of edge dislocations is referred to as ______ boundary. |
| A. | Tilt |
| B. | Twin |
| C. | Twist |
| D. | Sub |
| Answer» B. Twin | |
| 6. |
A_LOW_ANGLE_GRAIN_BOUNDARY,_FORMED_BY_SET_OF_________DISLOCATIONS,_IS_DEFINED_AS_TWIST_BOUNDARY.?$ |
| A. | Edge |
| B. | Mixed |
| C. | Screw |
| D. | Taylor |
| Answer» D. Taylor | |
| 7. |
What is the stacking sequence for FCC structure?$ |
| A. | ABABAB |
| B. | ABCABC |
| C. | AAA |
| D. | ABCDABCD |
| Answer» C. AAA | |
| 8. |
High_angle_grain_boundaries_provide_easy_atom_diffusion_in_a_solid_state.$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
Higher Stacking fault energy materials face more difficulty in cross slip and climb. |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
Stacking_fault_energy_of_silver_is______ |
| A. | 40 – 50 mJm<sup>-2</sup> |
| B. | 70 – 80 mJm<sup>-2</sup> |
| C. | 10 – 20 mJm<sup>-2</sup> |
| D. | 20 – 30 mJm<sup>-2</sup> |
| Answer» E. | |
| 11. |
A low angle grain boundary formed by an array of edge dislocations is referred to as ______ boundary? |
| A. | Tilt |
| B. | Twin |
| C. | Twist |
| D. | Sub |
| Answer» B. Twin | |
| 12. |
Mechanical twins are commonly observed in _____ while annealing twins are observed in ______ |
| A. | FCC, BCC |
| B. | BCC, HCP |
| C. | FCC, HCP |
| D. | HCP, FCC |
| Answer» E. | |
| 13. |
Nital etchant is used for revealing microstructure of _______ |
| A. | Cast iron |
| B. | Aluminium |
| C. | Brass |
| D. | Zinc alloys |
| Answer» B. Aluminium | |
| 14. |
What is the most common etchant used to reveal the grain structure of aluminium alloys? |
| A. | Picral |
| B. | Nital |
| C. | Kellers |
| D. | Adler etchant |
| Answer» D. Adler etchant | |
| 15. |
What is the range of misorientation angle in high angle grain boundaries? |
| A. | More than 10° |
| B. | 5 – 10° |
| C. | 1 – 5° |
| D. | Less than 1° |
| Answer» B. 5 ‚Äö√Ñ√∂‚àö√ë‚àö¬® 10¬¨¬®‚Äö√†√ª | |
| 16. |
Grain boundary improves ________ |
| A. | Electrical conductivity |
| B. | Thermal conductivity |
| C. | Creep strength |
| D. | Toughness |
| Answer» E. | |
| 17. |
Which property is deteriorated by increasing grain boundary area? |
| A. | Strength |
| B. | Corrosion resistance |
| C. | Hardness |
| D. | Toughness |
| Answer» C. Hardness | |
| 18. |
Which one of the following, is not exhibited by atoms present in the free surface? |
| A. | Improper coordination number |
| B. | Disrupted atomic bonding |
| C. | Higher free energy |
| D. | Less reactive than atoms present in the material |
| Answer» E. | |