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. |
0.68 is atomic factor of |
| A. | sc |
| B. | bcc |
| C. | fcc |
| D. | hcp |
| Answer» C. fcc | |
| 2. |
(100) 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 | |
| 3. |
Miller indices are the same for : |
| A. | parallel planes |
| B. | perpendicul ar planes |
| C. | orthogonal planes |
| D. | none of the above |
| Answer» B. perpendicul ar planes | |
| 4. |
(a√2)/4 is the radius of |
| A. | sc |
| B. | bcc |
| C. | fcc |
| D. | hcp |
| Answer» D. hcp | |
| 5. |
(a√3)/4 is the radius of |
| A. | sc |
| B. | bcc |
| C. | fcc |
| D. | hcp |
| Answer» C. fcc | |
| 6. |
                 working increases ultimate tensile strength. |
| A. | hot |
| B. | cold |
| C. | rolled |
| D. | none of the above |
| Answer» C. rolled | |
| 7. |
working is always accompanied by strain hardening |
| A. | hot |
| B. | cold |
| C. | rolled |
| D. | none of the above |
| Answer» C. rolled | |
| 8. |
Chances of cracks propagation is more in : |
| A. | hot working |
| B. | cold working |
| C. | welding |
| D. | machining |
| Answer» C. welding | |
| 9. |
In working refinement of crystal occurs. |
| A. | hot |
| B. | cold |
| C. | welding |
| D. | machining |
| Answer» B. cold | |
| 10. |
work hardening reduces : |
| A. | hardness |
| B. | toughness |
| C. | ductility |
| D. | none of the above |
| Answer» D. none of the above | |
| 11. |
                   plays an important role in crystal growth. |
| A. | edge dislocation |
| B. | screw dislocations |
| C. | twinning |
| D. | none of the above |
| Answer» C. twinning | |
| 12. |
Edge dislocations are the                   dimensional regions in a crystal |
| A. | 3 |
| B. | 2 |
| C. | 4 |
| D. | 1 |
| Answer» E. | |
| 13. |
                      dislocations can glide only |
| A. | screw |
| B. | edge |
| C. | twinning |
| D. | cross |
| Answer» B. edge | |
| 14. |
Surface defects are the                     dimensional regions in a crystal. |
| A. | 3 |
| B. | 2 |
| C. | 4 |
| D. | 1 |
| Answer» C. 4 | |
| 15. |
                       dislocations can glide & climb |
| A. | screw |
| B. | edge |
| C. | twinning |
| D. | cross |
| Answer» C. twinning | |
| 16. |
                     imperfections involve missing of cation & anion from it's respective position |
| A. | frankel |
| B. | schottky |
| C. | point |
| D. | interstitial |
| Answer» B. schottky | |
| 17. |
The displacement distance for atoms around the dislocation is the |
| A. | edge dislocation |
| B. | screw dislocations |
| C. | burger vector |
| D. | none of the above |
| Answer» D. none of the above | |
| 18. |
                     imperfections involve missing of cation from it's respective position |
| A. | frankel |
| B. | schottky |
| C. | point |
| D. | interstitial |
| Answer» C. point | |
| 19. |
slip occurs in discrete multiples of |
| A. | atomic |
| B. | points |
| C. | atomic spacing |
| D. | none of the above |
| Answer» D. none of the above | |
| 20. |
CRSS is calculated by using                     law |
| A. | bragg\s |
| B. | schimd\s |
| C. | bauchinger |
| D. | fleming\s |
| Answer» C. bauchinger | |
| 21. |
The shear stress required to produce slip on a single crystal plane is called the                    shear stress |
| A. | pure |
| B. | mixed |
| C. | critical |
| D. | critical resolved |
| Answer» E. | |
| 22. |
In metals the plastic deformation generally takes place by the mechanism of |
| A. | slipping |
| B. | twinning |
| C. | cold working |
| D. | hot working |
| Answer» B. twinning | |
| 23. |
Simple cube have atomic packing factor = |
| A. | 0.68 |
| B. | 0.74 |
| C. | 0.52 |
| D. | 0.54 |
| Answer» D. 0.54 | |
| 24. |
Co-ordianation no. of Simple cubic structure is |
| A. | 4 |
| B. | 6 |
| C. | 8 |
| D. | 12 |
| Answer» C. 8 | |
| 25. |
There are basic crystal systems |
| A. | 2 |
| B. | 4 |
| C. | 7 |
| D. | 6 |
| Answer» D. 6 | |
| 26. |
Total no of bravais lattice is |
| A. | 12 |
| B. | 14 |
| C. | 16 |
| D. | 10 |
| Answer» C. 16 | |
| 27. |
Which structure having higher density? |
| A. | bcc |
| B. | fcc |
| C. | sc |
| D. | none of the above |
| Answer» C. sc | |
| 28. |
Which one of the following is not basic component of Materials Science? |
| A. | cost |
| B. | properties |
| C. | structure |
| D. | performanc e |
| Answer» B. properties | |
| 29. |
Which one of following should be preferred for brittle materials |
| A. | hot working |
| B. | cold working |
| C. | both a and b |
| D. | can’t say |
| Answer» B. cold working | |
| 30. |
Which of the following is false? |
| A. | line defects are thermodyna mically stable |
| B. | dislocation can end inside a crystal without forming loop |
| C. | abc abc abc…is stacking sequence for hcp crystal |
| D. | all |
| Answer» D. all | |
| 31. |
What is the atomic packing factor of BCC |
| A. | 0.68 |
| B. | 0.52 |
| C. | 0.74 |
| D. | 0.72 |
| Answer» B. 0.52 | |
| 32. |
Value of critical shear stress is independent of |
| A. | bonding |
| B. | slip direction |
| C. | temperature |
| D. | purity |
| Answer» C. temperature | |
| 33. |
Typical density of dislocations in a solid |
| A. | 108-1010 μm-2 |
| B. | 108-1010 mm-2 |
| C. | 108-1010 cm-2 |
| D. | 108-1010 m-2 |
| Answer» E. | |
| 34. |
Time dependent permanent deformation is called _. |
| A. | plastic deformation |
| B. | elastic deformation |
| C. | creep |
| D. | anelastic deformation |
| Answer» D. anelastic deformation | |
| 35. |
This is a one type of twin |
| A. | forged |
| B. | cast |
| C. | rolled |
| D. | mechanical |
| Answer» E. | |
| 36. |
This is a one type of stacking fault |
| A. | twinns |
| B. | extrinsic |
| C. | glide |
| D. | climb |
| Answer» C. glide | |
| 37. |
The plane (1⎯ 11) is parallel to |
| A. | (-11-1) |
| B. | (-1-11) |
| C. | -111 |
| D. | (1-11) |
| Answer» B. (-1-11) | |
| 38. |
The lattice above the dislocation line is in in positive edge dislocations |
| A. | tension |
| B. | shear |
| C. | compression |
| D. | all |
| Answer» D. all | |
| 39. |
The geometry of unit cell can be completely defined by _ - |
| A. | wt. of unit cell |
| B. | three edge lengths of unit cell ( a,b & c) |
| C. | three interaxial angles of unit cell |
| D. | both b & c |
| Answer» E. | |
| 40. |
The lattice above the dislocation line is in in negative edge dislocations |
| A. | tension |
| B. | shear |
| C. | compression |
| D. | all |
| Answer» B. shear | |
| 41. |
The following mechanism contributes very little the diffusivity |
| A. | vacancy |
| B. | interstitial |
| C. | substitution al |
| D. | self- interstitial |
| Answer» E. | |
| 42. |
The basis of determining index values for a simple structure is unit cell consisting of |
| A. | 2- dimension spatial axes |
| B. | 3- dimensional spatial axes |
| C. | both a & b |
| D. | none of the above |
| Answer» C. both a & b | |
| 43. |
The atomic diameter of an FCC crystal (if a is lattice parameter) is |
| A. | a |
| B. | a/2 |
| C. | a/(4/√3) |
| D. | a/(4/√2) |
| Answer» E. | |
| 44. |
The atomic diameter of an BCC crystal (if a is lattice parameter) is |
| A. | a |
| B. | a/2 |
| C. | a/(4/√3) |
| D. | a/(4/√2) |
| Answer» D. a/(4/√2) | |
| 45. |
Temp. required for cold working is |
| A. | above 100°c |
| B. | below 100°c |
| C. | below recrystalliza tion |
| D. | above recrystalliza tion |
| Answer» D. above recrystalliza tion | |
| 46. |
The arrangement of multiple unit cells together is called |
| A. | crystal structure |
| B. | unit cell |
| C. | lattice constant |
| D. | lattice angle |
| Answer» B. unit cell | |
| 47. |
Temp. required for hot working is |
| A. | above 100°c |
| B. | below 100°c |
| C. | below recrystalliza tion |
| D. | above recrystalliza tion |
| Answer» E. | |
| 48. |
Surface finish is poor in |
| A. | hot working |
| B. | cold working |
| C. | both a and b |
| D. | can’t say |
| Answer» B. cold working | |
| 49. |
Surface finish is good in |
| A. | hot working |
| B. | cold working |
| C. | both a and b |
| D. | can’t say |
| Answer» C. both a and b | |
| 50. |
Surface decarburisation in steels in hot working . |
| A. | does not occurs |
| B. | occurs |
| Answer» C. | |