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This set of Material Science Multiple Choice Questions & Answers (MCQs) focuses on Material Science Set 9

Q1 | the and property of metals increase due to cold working
  • hardness, electrical conductivity
  • tensile strength, electrical conductivity
  • electrical resistance, internal stresses
  • corrosion resistance, ductility
Q2 | the and property of metals decrease due to cold working
  • hardness, electrical conductivity
  • tensile strength, electrical conductivity
  • electrical resistance, internal stresses
  • corrosion resistance, ductility
Q3 | the property of metals increases and property decreases due to cold working
  • hardness, electrical conductivity
  • ductility, electrical conductivity
  • electrical resistance, internal stresses
  • corrosion resistance, ductility
Q4 | the process by which the internal stresses are reduced in cold worked metal is called
  • strain hardening
  • hot working
  • heat treatment
  • cold treatment
Q5 | the heat treatment which is used to reduce the internal stresses after cold working is called as                       
  • hardeninig
  • annealing
  • carburising
  • quenching
Q6 | during recovery part of annealing treatment, which of the following properties are improved noticeably?
  • hardness, electrical resistance, tensile strength
  • electrical resistance, tensile strength, corrosion resistance
  • tensile strength, corrosion resistance, ductility
  • internal stresses, electrical resistance, corrosion resistance
Q7 | during which stage of annealing there is no major change in microstructure ?
  • recrystalliza tion
  • recovery
  • grain growth
  • none of the above
Q8 | the process of formation of new grains starts by the process of                         
  • recovery
  • nucleation
  • grain growth
  • none of the above
Q9 | nucleation starts at areas of                         
  • low energy
  • high energy
  • randomly
  • none of the above
Q10 |     new grain formation take place in stage of annealing treatment
  • recovery
  • grain growth
  • recrystalliza tion
  • none of the above
Q11 | after the recrystalllization stage
  • hardness and tensile strength reduces
  • internal stresses reduces whereas corrosion resistance increases
  • ductility increases
  • all of the above
Q12 | during grain growth takes place
  • new grains are formed
  • no change in
  • larger grains are formed
  • all of the above
Q13 | strain hardening followed by annealing is known as                   
  • cold working
  • hot working
  • strain hardening
  • all of the above
Q14 | there are no residual internal stresses after hot working because                      
  • metal is annealed before hot working
  • there are no dislocations
  • there is simultaneou s working and recrystalliza tion
  • all of the above
Q15 | wire drawing is a type of                         
  • cold working
  • hot working
  • cold working followed by hardening
  • none of the above
Q16 | hot forging is a type of                 
  • cold working
  • hot working
  • cold working followed by hardening
  • none of the above
Q17 | in working of metals, the microstructure is distorted
  • hot
  • cold
  • both
  • none of the above
Q18 | it is possible to continuosly work on metal during working
  • hot
  • cold
  • both
  • none of the above
Q19 |   cold working requires higherthan hot working
  • temperature
  • time
  • energy for plastic deformation
  • none of the above
Q20 | the possibility of oxidation is higher in case of working of metals
  • hot
  • cold
  • both
  • none of the above
Q21 | in case of hot working of metals, there is higher possibility of                         
  • oxidation
  • decarburizat ion
  • both a and b
  • none of the above
Q22 | the machinery used for hot working is than used for cold working
  • cheaper
  • expensive
  • same
  • depends on mertals used
Q23 | the resolved shear stress of a unit cell in nickel is N/mm2 if a tensile stress of 13.7 Mpa is applied. Take angle between the axial force and slip direction is 450 and angle between axial force and normal to slip is 540
  • 2.3
  • 5.7
  • 5.2
  • 6.1
Q24 | if resolved shear stress is maximum, it is given by              
  • σt
  • 2σt
  • 4σt
  • 0.5σt
Q25 | at 450 the resolved shear stress is
  • minimum
  • maximum
  • zero
  • none of the above