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This set of Material Science Multiple Choice Questions & Answers (MCQs) focuses on Material Science Set 12

Q1 | Following strengthening mechanism applies to multi-phase material
  • grain size reduction
  • dispersion hardening
  • solid solution strengthenin g
  • strain hardening
Q2 | Forces required in cold working isthan hot working
  • greater
  • less
  • equal
  • can’t say
Q3 | Frenkel defect have missing of
  • cation
  • anion
  • electron
  • both a&b
Q4 | Good surface finish in................ process
  • cold working
  • hot working
  • casting
  • welding
Q5 | grain boundaries the dislocation motion
  • allows
  • restricts
  • bypass
  • all of the above
Q6 | Grain boundaries decides                          of dislocations that can move
  • lenghts
  • magnitude
  • direction
  • none of the above
Q7 | Handling is difficult in
  • hot working
  • cold working
  • both a and b
  • can’t say
Q8 | Hardness during over-aging
  • decreases
  • increases
  • constant
  • decreases abruptly
Q9 | HCP have Average no. of atoms per unit cell
  • 6
  • 2
  • 4
  • 8
Q10 | HCP having atomic packing factor
  • 0.68
  • 0.52
  • 0.74
  • 0.72
Q11 | Lower the degree of deformation, recrystallization temperature is
  • higher
  • lower
  • no effect
  • either higher or lower
Q12 | Higher the degree of deformation, recrystallization temperature is
  • higher
  • lower
  • no effect
  • either higher or lower
Q13 | Hot working process is carried out on……….. Recrystallisation temp.
  • equal
  • above
  • below
  • none of the above
Q14 | If the deformation is carried at 0°C, it is
  • cold working
  • hot working
  • both a and b
  • can’t say
Q15 | If the deformation is carried at 100°C, it is
  • cold working
  • hot working
  • both a and b
  • can’t say
Q16 | If the deformation is carried at 500°C, it is
  • cold working
  • hot working
  • both a and b
  • can’t say
Q17 | If the deformation is carried out above RCT, it is
  • cold working
  • hot working
  • both a and b
  • none
Q18 | If the deformation is carried out below RCT, it is
  • cold working
  • hot working
  • both a and b
  • none
Q19 | In BCC, the lattice parameter (a) is
  • (4/√3) r
  • 4/√3 r
  • (4/√2) r
  • 4/√2 r
Q20 | In case of polycrystalline materials regeneration rate of dislocations
  • increases
  • decreases
  • remains same
  • can’t say
Q21 | In climb, the dislocation moves of the surface
  • in , glide
  • out, glide
  • in, twinns
  • out, twinns
Q22 | In Cold work,strength
  • increases
  • decreases
  • remains same
  • none
Q23 | In cold working, corrosion resistance
  • increases
  • decreases
  • remains same
  • can’t say
Q24 | In cold working, due to strain hardening ductility of metal                     
  • increases
  • decreases
  • remains same
  • can’t say
Q25 | In cold working, electrical resistance
  • increases
  • decreases
  • remains same
  • can’t say