MCQOPTIONS
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MCQOPTIONS
This section includes 19 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. |
Which statement is false regarding dislocation? |
| A. | Dislocation can move if applied shear stress is greater than lattice frictional stress |
| B. | Pure screw dislocations cannot climb |
| C. | Critical normal stress is much greater than the theoretical |
| D. | Peierls and Nabbaro stress is much greater than the theoretical shear stress of a perfect lattice |
| Answer» E. | |
| 2. |
Pure screw dislocation can climb. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
The positive climb involves diffusion of _____ while negative climb involves diffusion of _____ |
| A. | Vacancies, vacancies |
| B. | Vacancies, interstitials |
| C. | Interstitials, vacancies |
| D. | Interstitials, interstitials |
| Answer» C. Interstitials, vacancies | |
| 4. |
____ is important in ductile metals for plastic deformation. |
| A. | Climb |
| B. | Glide |
| C. | Cross slip |
| D. | Twinning |
| Answer» D. Twinning | |
| 5. |
Resolved shear stress is given as τ = ______ |
| A. | σ sinφ sinλ |
| B. | σ sinφ cosλ |
| C. | σ cosφ sinλ |
| D. | σ cosφ cosλ |
| Answer» E. | |
| 6. |
Match the following? |
| A. | i-r, ii-s, iii-p, iv-q |
| B. | i-r, ii-s, iii-q, iv-p |
| C. | i-s, ii-r, iii-q, iv-p |
| D. | i-s, ii-r, iii-p, iv-qView Answer |
| Answer» D. i-s, ii-r, iii-p, iv-qView Answer | |
| 7. |
_____IS_IMPORTANT_IN_DUCTILE_METALS_FOR_PLASTIC_DEFORMATION.?$ |
| A. | Climb |
| B. | Glide |
| C. | Cross slip |
| D. | Twinning |
| Answer» C. Cross slip | |
| 8. |
Pure screw dislocation can climb.$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
The_positive_climb_involves_diffusion_of_______while_negative_climb_involves_diffusion_of______$ |
| A. | Vacancies, vacancies |
| B. | Vacancies, interstitials |
| C. | Interstitials, vacancies |
| D. | Interstitials, interstitials |
| Answer» C. Interstitials, vacancies | |
| 10. |
Movement of dislocation from one position to next involves the movement of atoms to ____ |
| A. | Fraction of an interatomic distance |
| B. | An interatomic distance |
| C. | Few interatomic distances |
| D. | Large number of interatomic distance |
| Answer» E. | |
| 11. |
____ is a thermal activated process. |
| A. | Cross slip |
| B. | Climb |
| C. | Glide |
| D. | Shear |
| Answer» B. Climb | |
| 12. |
Jogs are sinks and sources of vacancies. |
| A. | True |
| B. | False |
| Answer» C. | |
| 13. |
What is the theoretical CRSS value for Iron crystal? |
| A. | 9.2 x 10<sup>3</sup> MPa |
| B. | 10.3 x 10<sup>3</sup> MPa |
| C. | 11.0 x 10<sup>3</sup> MPa |
| D. | 21.0 x 10<sup>3</sup> MPa |
| Answer» D. 21.0 x 10<sup>3</sup> MPa | |
| 14. |
What is experimental CRSS value of silver crystal? |
| A. | 0.37 x 10<sup>3</sup> MPa |
| B. | 0.49 x 10<sup>3</sup> MPa |
| C. | 0.78 x 10<sup>3</sup> MPa |
| D. | 0.26 x 10<sup>3</sup> MPa |
| Answer» E. | |
| 15. |
Lattice frictional stress is known as ____ stress. |
| A. | Shear |
| B. | Normal |
| C. | Peierls and Nabbaro |
| D. | Isotropic |
| Answer» B. Normal | |
| 16. |
Resolved shear stress is given as τ = ______$ |
| A. | σ sinφ sinλ |
| B. | σ sinφ cosλ |
| C. | σ cosφ sinλ |
| D. | σ cosφ cosλ |
| Answer» D. ‚âà√¨‚àö√¢ cos‚âà√¨‚àö√∫ cos‚âà√≠¬¨‚Ñ¢ | |
| 17. |
What is the slip direction in BCC crystal structure? |
| A. | <110> |
| B. | <11<span style="text-decoration:overline;">2</span>0> |
| C. | <111> |
| D. | <101> |
| Answer» E. | |
| 18. |
What is the slip plane in HCP crystals? |
| A. | (0001) |
| B. | (0<span style="text-decoration:overline;">1</span>10) |
| C. | (10<span style="text-decoration:overline;">1</span>1) |
| D. | (10<span style="text-decoration:overline;">1</span>2) |
| Answer» B. (0<span style="text-decoration:overline;">1</span>10) | |
| 19. |
i-r, ii-s, iii-p, iv-q |
| A. | i-r, ii-s, iii-q, iv-p |
| B. | i-s, ii-r, iii-q, iv-p |
| C. | i-s, ii-r, iii-p, iv-q |
| Answer» B. i-s, ii-r, iii-q, iv-p | |