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This set of Material Science Multiple Choice Questions & Answers (MCQs) focuses on Material Science Set 16
Q1 | In metals the plastic deformation generally takes place by the mechanism of
- slipping
- twinning
- cold working
- hot working
Q2 | The shear stress required to produce slip on a single crystal plane is called the shear stress
- pure
- mixed
- critical
- critical resolved
Q3 | CRSS is calculated by using law
- bragg\s
- schimd\s
- bauchinger
- fleming\s
Q4 | slip occurs in discrete multiples of
- atomic
- points
- atomic spacing
- none of the above
Q5 | imperfections involve missing of cation from it's respective position
- frankel
- schottky
- point
- interstitial
Q6 | imperfections involve missing of cation & anion from it's respective position
- frankel
- schottky
- point
- interstitial
Q7 | The displacement distance for atoms around the dislocation is the
- edge dislocation
- screw dislocations
- burger vector
- none of the above
Q8 | dislocations can glide & climb
- screw
- edge
- twinning
- cross
Q9 | dislocations can glide only
- screw
- edge
- twinning
- cross
Q10 | Surface defects are the dimensional regions in a crystal.
- 3
- 2
- 4
- 1
Q11 | Edge dislocations are the dimensional regions in a crystal
- 3
- 2
- 4
- 1
Q12 | plays an important role in crystal growth.
- edge dislocation
- screw dislocations
- twinning
- none of the above
Q13 | work hardening reduces :
- hardness
- toughness
- ductility
- none of the above
Q14 | Chances of cracks propagation is more in :
- hot working
- cold working
- welding
- machining
Q15 | In working refinement of crystal occurs.
- hot
- cold
- welding
- machining
Q16 | working is always accompanied by strain hardening
- hot
- cold
- rolled
- none of the above
Q17 | working increases ultimate tensile strength.
- hot
- cold
- rolled
- none of the above
Q18 | (a√3)/4 is the radius of
- sc
- bcc
- fcc
- hcp
Q19 | (a√2)/4 is the radius of
- sc
- bcc
- fcc
- hcp
Q20 | Miller indices are the same for :
- parallel planes
- perpendicul ar planes
- orthogonal planes
- none of the above
Q21 | 0.68 is atomic factor of
- sc
- bcc
- fcc
- hcp
Q22 | 4 is avg. atoms per unit cell for
- sc
- bcc
- fcc
- hcp
Q23 | (001) is a plane of the cube & is
- horizontal
- vertical
- inclined to z axis
- inclined to x axis
Q24 | (100) is a plane of the cube & is
- horizontal
- vertical
- inclined to z axis
- inclined to x axis
Q25 | (010) is a plane of the cube & is
- horizontal
- vertical
- inclined to z axis
- inclined to x axis