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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