MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The metal which has got BCC structure is: |
| A. | silver |
| B. | tungsten |
| C. | zinc |
| D. | aluminiu m watch |
| Answer» C. zinc | |
| 2. |
The crystal structure of most common metal is: |
| A. | hexagonal |
| B. | cubic |
| C. | orthorhomb i c |
| D. | any of the above |
| Answer» C. orthorhomb i c | |
| 3. |
How many molecules per unit cell are there in a face centered cubic lattice? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 4. |
The crystal structure of Germanium is: |
| A. | hcp |
| B. | bcc |
| C. | fcc |
| D. | diamon d cube |
| Answer» E. | |
| 5. |
How many atoms are there per unit cell in a body centered cubic lattice system? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 6 |
| Answer» B. 3 | |
| 6. |
The crystal structure of graphite is: |
| A. | hcp |
| B. | fcc |
| C. | bcc |
| D. | none of the above |
| Answer» B. fcc | |
| 7. |
The crystal structure of all the following material is HCP except: |
| A. | graphite |
| B. | zinc |
| C. | magnesium |
| D. | aluminium |
| Answer» E. | |
| 8. |
(001) is a plane of the cube and is: |
| A. | horizontal |
| B. | vertical |
| C. | inclined to vp |
| D. | inclined to hp |
| Answer» B. vertical | |
| 9. |
0.68 is the atomic packing factore of: |
| A. | bcc |
| B. | fcc |
| C. | simple cube |
| D. | hcp |
| Answer» B. fcc | |
| 10. |
The crystal structure of silver is: |
| A. | fcc |
| B. | bcc |
| C. | hcp |
| D. | none of the above |
| Answer» B. bcc | |
| 11. |
Among the crystal structure, which has the highest packing fraction. |
| A. | bcc |
| B. | fcc |
| C. | diamon d cube |
| D. | hcp |
| Answer» C. diamon d cube | |
| 12. |
The miller indices are the same for: |
| A. | parall el plane s |
| B. | perpendicul a r planes |
| C. | orthogon al planes |
| D. | crystallogra p hic planes |
| Answer» B. perpendicul a r planes | |
| 13. |
Annealing is done: |
| A. | to harden the surface |
| B. | surface smoothnes s |
| C. | relievin g stresse s |
| D. | improving micro structure for good surface finish |
| Answer» D. improving micro structure for good surface finish | |
| 14. |
-------- working increases ultimate tensile strength. |
| A. | cold |
| B. | hot |
| C. | annealing |
| D. | none of the above |
| Answer» B. hot | |
| 15. |
-------- working is always accompanied by strain hardening. |
| A. | hot |
| B. | cold |
| C. | rolled |
| D. | all these of above |
| Answer» C. rolled | |
| 16. |
In ------working refinement of crystal occures. |
| A. | cold |
| B. | hot |
| C. | annealing |
| D. | none of above |
| Answer» C. annealing | |
| 17. |
Chances of cracks propogation is more in: |
| A. | hot working |
| B. | cold working |
| C. | welding |
| D. | mechining |
| Answer» C. welding | |
| 18. |
A metal is said to be--------- worked, if it is mechanically processed below the crystallization temperature of the metal. |
| A. | hot |
| B. | cold |
| C. | rolled |
| D. | bend |
| Answer» C. rolled | |
| 19. |
Grain growth is an increase in ----- --. |
| A. | grain size |
| B. | hardness |
| C. | malleability |
| D. | brittleness |
| Answer» B. hardness | |
| 20. |
-------- is the low temperature phenomenon which results in the rstoration of the physical properties without any observable change in microstructure. |
| A. | grain size |
| B. | recovery |
| C. | grain growth |
| D. | recrystalliz at ion |
| Answer» C. grain growth | |
| 21. |
Work hardening reduces: |
| A. | malleability |
| B. | hardness |
| C. | toughness |
| D. | ductility |
| Answer» E. | |
| 22. |
-------- dislocation plays an important role in crystal growth. |
| A. | edge |
| B. | screw |
| C. | vacancies |
| D. | schotty |
| Answer» C. vacancies | |
| 23. |
Surface defects are the -------- dimensional regions in a crystal. |
| A. | three |
| B. | two |
| C. | four |
| D. | one |
| Answer» C. four | |
| 24. |
-------- are difined as the irregularities in the structure of metals. |
| A. | atomic |
| B. | dislocation |
| C. | point |
| D. | vacancies |
| Answer» C. point | |
| 25. |
-------- dislocation can glide and climb. |
| A. | screw |
| B. | edge |
| C. | cross |
| D. | atomic |
| Answer» C. cross | |
| 26. |
-------- imperfections involve vacancies of a pair ions of opposite charges. |
| A. | frankel |
| B. | schottky |
| C. | dislocation |
| D. | point |
| Answer» C. dislocation | |
| 27. |
The displacement distance for atoms around the dislocation is the---- --. |
| A. | burger vector |
| B. | screw |
| C. | edge |
| D. | point |
| Answer» B. screw | |
| 28. |
A ............is the simplest point defect and envolves a missing atom within a metal. |
| A. | schottky |
| B. | vacancy |
| C. | line |
| D. | dislocation |
| Answer» C. line | |
| 29. |
.......... defects are inperfect point like region in a crystal. |
| A. | line |
| B. | point |
| C. | edge |
| D. | screw |
| Answer» C. edge | |
| 30. |
Volume imperfections can be |
| A. | twin |
| B. | slip |
| C. | stacking fault |
| D. | noncrystalli ne regions |
| Answer» E. | |
| 31. |
The imperfections may be minimised by |
| A. | thermal energy |
| B. | making metal in fibre form |
| C. | surface treatment |
| D. | all of the above |
| Answer» E. | |
| 32. |
The cross slip occurs in : |
| A. | climb up motion |
| B. | screw dislocation |
| C. | gliding motion |
| D. | none of the above |
| Answer» C. gliding motion | |
| 33. |
Ideal crystals have |
| A. | no imperfectio ns |
| B. | real crystals |
| C. | vaccancies |
| D. | frenkel defects |
| Answer» B. real crystals | |
| 34. |
On thermal excitation this                   defect may cause |
| A. | vacancy |
| B. | edge dislocations |
| C. | screw dislocations |
| D. | none of the above |
| Answer» B. edge dislocations | |
| 35. |
The grain boundary area decreases when a polycrystalline material is heated |
| A. | below recrystalliza tion temp. |
| B. | above recrystalliza tion temp. |
| C. | above room temp. |
| D. | below 0.5 tm |
| Answer» C. above room temp. | |
| 36. |
Directions of edge dislocation & burger vector are to each other |
| A. | perpendicul ar |
| B. | parallel |
| C. | inclined at 45° |
| D. | concurrent |
| Answer» B. parallel | |
| 37. |
Presence of carbon atom in iron is an example of impurity |
| A. | substitution al |
| B. | interstitial |
| C. | frankel |
| D. | schottky |
| Answer» C. frankel | |
| 38. |
The miller indices of a plane are proportional to : |
| A. | the reciprocal of numerical parameters of the intercepts |
| B. | the square of unit cell dimensions |
| C. | the interccepts of the planes on the coordinate axes |
| D. | interplaner spacing |
| Answer» B. the square of unit cell dimensions | |
| 39. |
A material having different properties in different directions is known as |
| A. | isotropic |
| B. | anisotropic |
| C. | crystalline |
| D. | amorphous |
| Answer» C. crystalline | |
| 40. |
In a simple cubic structure, [100] and (100) parallel? |
| A. | no |
| B. | yes |
| C. | maybe yes |
| D. | none of the above |
| Answer» B. yes | |
| 41. |
                 diffusion implies atomic movement along the surface of a plane |
| A. | atomic |
| B. | surface |
| C. | volume |
| D. | grain boundary |
| Answer» C. volume | |
| 42. |
Atom movements in twinnning are much than atomic spacing |
| A. | more |
| B. | less |
| C. | equal |
| D. | none of the above |
| Answer» C. equal | |
| 43. |
                   is a system of notations of planes within a crystal of space lattice |
| A. | space lattice |
| B. | burger vector |
| C. | miller indices |
| D. | none of the above |
| Answer» D. none of the above | |
| 44. |
A crystal structure in a regular array of atoms is arranged in one of the             space lattices |
| A. | 10 |
| B. | 12 |
| C. | 14 |
| D. | none of the above |
| Answer» D. none of the above | |
| 45. |
The crystal structure of most common metals is |
| A. | hexagonal |
| B. | cubic |
| C. | orthorhombi c |
| D. | triclinic |
| Answer» C. orthorhombi c | |
| 46. |
The linear disturbance of atomic arrangement is known as |
| A. | imperfectio ns |
| B. | slip |
| C. | dislocations |
| D. | none of the above |
| Answer» D. none of the above | |
| 47. |
(111) is a plane of the cube & is |
| A. | horizontal |
| B. | vertical |
| C. | inclined to z axis |
| D. | none of the above |
| Answer» D. none of the above | |
| 48. |
(001) is a plane of the cube & is |
| A. | horizontal |
| B. | vertical |
| C. | inclined to z axis |
| D. | inclined to x axis |
| Answer» B. vertical | |
| 49. |
4 is avg. atoms per unit cell for |
| A. | sc |
| B. | bcc |
| C. | fcc |
| D. | hcp |
| Answer» D. hcp | |
| 50. |
(010) is a plane of the cube & is |
| A. | horizontal |
| B. | vertical |
| C. | inclined to z axis |
| D. | inclined to x axis |
| Answer» C. inclined to z axis | |