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. |
Compressive stresses don’t make a serious problem when applied on brittle materials. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
Orowan and Irwin theory is given for cracking in brittle materials. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
What does plastic deformation do on crack propagation? |
| A. | Lowers surface energy |
| B. | Sharpens the tip |
| C. | Reduces required work |
| D. | Increases concentration of stress |
| Answer» B. Sharpens the tip | |
| 4. |
Elastic strain energy ___ with increase in crack length. |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | May increase or decrease |
| Answer» C. Remains constant | |
| 5. |
As length of crack increases, surface energy of crack ___ |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | May increase or decrease |
| Answer» B. Decreases | |
| 6. |
Surface energy of crack is given by __________a) 4ϒsab) 2ϒs( |
| A. | 4ϒsa |
| B. | 2ϒs(a) 1/2 |
| C. | 2ϒsE |
| D. | 2ϒsa |
| Answer» B. 2ϒs(a) 1/2 | |
| 7. |
Elastic strain energy is proportional to ____________a) ( |
| A. | (a)1/2 |
| B. | a |
| C. | a2 |
| D. | a3 |
| Answer» D. a3 | |
| 8. |
ELASTIC_STRAIN_ENERGY_____WITH_INCREASE_IN_CRACK_LENGTH.?$ |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | May increase or decrease |
| Answer» C. Remains constant | |
| 9. |
Orowan and Irwin theory is given for cracking in brittle materials.$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
What_does_plastic_deformation_do_on_crack_propagation?$ |
| A. | Lowers surface energy |
| B. | Sharpens the tip |
| C. | Reduces required work |
| D. | Increases concentration of stress |
| Answer» B. Sharpens the tip | |
| 11. |
Compressive_stresses_don’t_make_a_serious_problem_when_applied_on_brittle_materials.$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
As length of crack increases, surface energy of crack __? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | May increase or decrease |
| Answer» B. Decreases | |
| 13. |
Surface energy of crack is given by __________ |
| A. | 4ϒ<sub>s</sub>a |
| B. | 2ϒ<sub>s</sub>(a)<sup> 1/2</sup> |
| C. | 2ϒ<sub>s</sub>E |
| D. | 2ϒ<sub>s</sub>a |
| Answer» B. 2‚âà√¨‚àö‚â†<sub>s</sub>(a)<sup> 1/2</sup> | |
| 14. |
Surface energy associated with crack is proportional to ______ |
| A. | a |
| B. | a<sup>2</sup> |
| C. | a<sup>1/2</sup> |
| D. | a<sup>-1</sup> |
| Answer» B. a<sup>2</sup> | |
| 15. |
On tensile loading, the elastic energy stored per unit volume will ___ with an increase in load. |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Increases or decreases |
| Answer» B. Decreases | |
| 16. |
Elastic strain energy is proportional to ____________ |
| A. | (a)<sup>1/2</sup> |
| B. | a |
| C. | a<sup>2</sup> |
| D. | a<sup>3</sup> |
| Answer» D. a<sup>3</sup> | |
| 17. |
What is the expression for maximum stress at the tip of crack? |
| A. | σ<sub>max</sub> = 2 σ (ar)<sup>1/2</sup> |
| B. | σ<sub>max</sub> = 2 σ (a/r) <sup>1/2</sup> |
| C. | σ<sub>max</sub> = 2 σar |
| D. | σ<sub>max</sub> = 2 (σar)<sup>1/2</sup> |
| Answer» C. ‚âà√¨‚àö√¢<sub>max</sub> = 2 ‚âà√¨‚àö√¢ar | |
| 18. |
Which theory explains brittle fracture? |
| A. | Griffith |
| B. | Cottrell |
| C. | Taylor |
| D. | Dislocation |
| Answer» B. Cottrell | |
| 19. |
In which type of brittle fracture, crack travels through grain boundaries? |
| A. | Trans granular |
| B. | Intra granular |
| C. | Intergranular |
| D. | Fibrous |
| Answer» D. Fibrous | |