MCQOPTIONS
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MCQOPTIONS
This section includes 33 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. |
What is the Hall-Petch constant for Iron? |
| A. | 0.068 |
| B. | 0.11 |
| C. | 0.71 |
| D. | 1.77 |
| Answer» D. 1.77 | |
| 2. |
What is the CRSS value of a copper crystal? |
| A. | 0.5 |
| B. | 0.75 |
| C. | 5 |
| D. | 15 |
| Answer» B. 0.75 | |
| 3. |
According to ________ five independent systems are required to maintain the reliability of grain boundaries. |
| A. | Hal-Petch principle |
| B. | Mohr-Coulomb theory |
| C. | Tresca criterion |
| D. | Von Mises criterion |
| Answer» E. | |
| 4. |
What is the value of Boltzmann’s constant? |
| A. | 8.314 |
| B. | 1.38 * 10-23 |
| C. | 1.38 |
| D. | 8.314 * 10-23 |
| Answer» C. 1.38 | |
| 5. |
Pile up of dislocations causes strain hardening. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
The slope of stress-strain curve in plastic range is _____ |
| A. | Rate of strain hardening |
| B. | Bauschinger effect |
| C. | True strain |
| D. | Resolved shear stress |
| Answer» B. Bauschinger effect | |
| 7. |
Value of CRSS ____ with increasing impurity contents in a metal crystal. |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | May increase or decrease |
| Answer» B. Decreases | |
| 8. |
Value of CRSS for HCP crystal _____ with increasing temperature. |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | First decreases then remain unaffected |
| Answer» E. | |
| 9. |
What is interplanar spacing for {1 1 0} planes in BCC? |
| A. | a/√3 |
| B. | a/2√2 |
| C. | a/2 |
| D. | a/√2 |
| Answer» C. a/2 | |
| 10. |
What is interplanar spacing for {1 1 1} planes in BCC? |
| A. | a/2√3 |
| B. | a/√2 |
| C. | a/2 |
| D. | a√3/2 |
| Answer» B. a/√2 | |
| 11. |
What is the atomic density on the prismatic plane? |
| A. | 1/a2 |
| B. | 2/ac |
| C. | 2/a2 |
| D. | 2/√3a2 |
| Answer» C. 2/a2 | |
| 12. |
VALUE_OF_CRSS______WITH_INCREASING_IMPURITY_CONTENTS_IN_A_METAL_CRYSTAL.?$ |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | May increase or decrease |
| Answer» B. Decreases | |
| 13. |
WHAT_IS_THE_CRSS_VALUE_OF_A_COPPER_CRYSTAL??$ |
| A. | 0.5 |
| B. | 0.75 |
| C. | 5 |
| D. | 15 |
| Answer» B. 0.75 | |
| 14. |
Pile up of dislocations causes strain hardening.$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 15. |
The slope of stress-strain curve in plastic range is _____$ |
| A. | Rate of strain hardening |
| B. | Bauschinger effect |
| C. | True strain |
| D. | Resolved shear stress |
| Answer» B. Bauschinger effect | |
| 16. |
What is the Hall-Petch constant for Iron?$ |
| A. | 0.068 |
| B. | 0.11 |
| C. | 0.71 |
| D. | 1.77 |
| Answer» D. 1.77 | |
| 17. |
Ideal rolling texture is developed after ____ cold deformation. |
| A. | 20-30% |
| B. | 40-50% |
| C. | 60-70% |
| D. | 80-90% |
| Answer» E. | |
| 18. |
Recrystallization temperature is defined as the temperature at which cold worked metal recrystallizes completely in 1 hour. |
| A. | True |
| B. | False |
| Answer» C. | |
| 19. |
Value of CRSS for HCP crystal _____ with increasing temperature? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | First decreases then remain unaffected |
| Answer» E. | |
| 20. |
According to ________ five independent systems are required to maintain the reliability of grain boundaries? |
| A. | Hal-Petch principle |
| B. | Mohr-Coulomb theory |
| C. | Tresca criterion |
| D. | Von Mises criterion |
| Answer» E. | |
| 21. |
What is c/a ratio of titanium? |
| A. | 1.886 |
| B. | 1.632 |
| C. | 1.587 |
| D. | 1.586 |
| Answer» D. 1.586 | |
| 22. |
How many slip systems are present in a NaCl crystal? |
| A. | 3 |
| B. | 6 |
| C. | 12 |
| D. | 18 |
| Answer» C. 12 | |
| 23. |
What is c/a ratio of magnesium? |
| A. | 1.856 |
| B. | 1.624 |
| C. | 1.593 |
| D. | 1.567 |
| Answer» C. 1.593 | |
| 24. |
What is the slip plane for an FCC crystal? |
| A. | {110} |
| B. | {111} |
| C. | {112} |
| D. | {123} |
| Answer» C. {112} | |
| 25. |
c/a ratio is highest for ______ and least for _____ |
| A. | Mg, Co |
| B. | Zr, Ti |
| C. | Cd, Be |
| D. | Hg, Be |
| Answer» D. Hg, Be | |
| 26. |
At what value of the index of strain rate sensitivity does the material behave superplastically? |
| A. | 0 |
| B. | 0.2 |
| C. | 0.4 – 0.9 |
| D. | 1.0 – 1.2 |
| Answer» D. 1.0 ‚Äö√Ñ√∂‚àö√ë‚àö¬® 1.2 | |
| 27. |
{1 1 1} are called _____ planes. |
| A. | Basal |
| B. | Prismatic |
| C. | Octahedral |
| D. | Cube |
| Answer» E. | |
| 28. |
What is the value of Boltzmann’s constant?$ |
| A. | 8.314 |
| B. | 1.38 * 10<sup>-23</sup> |
| C. | 1.38 |
| D. | 8.314 * 10<sup>-23</sup> |
| Answer» C. 1.38 | |
| 29. |
The process of increasing strength of a material by changing grain size known as __________ |
| A. | Grain boundary strengthening |
| B. | Work hardening |
| C. | Solid solution hardening |
| D. | Precipitation hardening |
| Answer» B. Work hardening | |
| 30. |
What is interplaner spacing for {1 1 1} planes in BCC? |
| A. | a/2‚àö3 |
| B. | a/‚àö2 |
| C. | a/2 |
| D. | a‚àö3/2 |
| Answer» B. a/‚Äö√Ñ√∂‚àö‚Ć‚àö‚àÇ2 | |
| 31. |
What is the SI unit for the stress of a material? |
| A. | N |
| B. | N m |
| C. | N m<sup>-1</sup> |
| D. | N m<sup>-2</sup> |
| Answer» E. | |
| 32. |
What is atomic density on {1 1 1} plane in fcc? |
| A. | 4/‚àö3a<sup>2</sup> |
| B. | ‚àö2/a<sup>2</sup> |
| C. | 2/a<sup>2</sup> |
| D. | 1/a<sup>2</sup> |
| Answer» B. ‚Äö√Ñ√∂‚àö‚Ć‚àö‚àÇ2/a<sup>2</sup> | |
| 33. |
What is atomic density on prismatic plane? |
| A. | 1/a<sup>2</sup> |
| B. | 2/ac |
| C. | 2/a<sup>2</sup> |
| D. | 2/‚àö3a<sup>2</sup> |
| Answer» C. 2/a<sup>2</sup> | |