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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