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This set of Material Science Multiple Choice Questions & Answers (MCQs) focuses on Material Science Set 8
Q1 | The appears as a single thin line in the microscopic structure
- slip
- twinning
- combination of slip and twinning
- all of the above
Q2 | the disappears after polishing
- slip
- twinning
- combination of slip and twinning
- all of the above
Q3 | the can be seen in metal even after polishing
- slip
- twinning
- combination of slip and twinning
- all of the above
Q4 | the mechanism can be takes place due to thermal treatment
- slip
- twinning
- combination of slip and twinning
- all of the above
Q5 | metals with FCC crystal structure are often subjected to
- slip
- twinning
- less of slip and more of twinning
- all of the above
Q6 | metals with FCC and BCC crystal structure are often subjected to
- slip
- twinning
- combination of slip and twinning
- all of the above
Q7 | number of slip systems in metals decides about
- hardness of metals
- strength of metal
- ductility of metal
- all of the above
Q8 | number of slip systems in FCC are
- 12
- 24
- 21
- 26
Q9 | the law is used to determine the value of critical shear stress
- millers
- burgers
- schmids
- none of the above
Q10 | the schmids law is used to calculate critical shear stress for _ structure
- polycrystalli ne
- single crystal
- atoms
- none of the above
Q11 | the maximum resolved shear stress is given by
- Ƭresolve =σt
- Ƭresolve =σt/3
- Ƭresolve =σt/2
- none of the above
Q12 | slip starts to occur when the value of resolved shear stress
- reduces below critical shear stress
- is at critical shear stress
- increases abive critical shear stress
- none of the above
Q13 | FCC metals have value of critical shear stress as compared to BCC metals
- same
- lower
- higher
- random
Q14 | FCC metals have higher ductility than BCC metals since _
- fcc metals have higher
- fcc metals have lower
- fcc metals have lower
- fcc metals have higher
Q15 | the phenomenon by virtue of which metals become harder and stronger without any heat treatment is called
- strain hardening
- work hardening
- all of the above
- none of the above
Q16 | after intial cold working, the stress required to further deform the material is
- same
- lower
- higher
- random
Q17 | work hardening is the phenomenon observed if metal is worked the recrystallization temperature
- above
- below
- independent of
- none of the above
Q18 | working of metal below crystallization temperature is known as
- cold working
- hot working
- any one of above
- none of the above
Q19 | working of metal above crystallization temperature is known as
- cold working
- hot working
- any one of above
- none of the above
Q20 | for a given metal its recrystallization temperature depends on
- amonut of cold working
- grain size
- melting temperature s
- all of the above
Q21 | finer is the grain size -
- more is recrystalliza tion temperature
- lesser is the recrystalliza tion temperature
- recrystalliza tion temperature remains same
- none of the above
Q22 | Frank-Reed source is associated with-
- vacancy and interstitial defect
- reductiion in dislocations
- multiplicati on of dislocations
- none of the above
Q23 | finer is the grain size -
- more is dislocation density in cold working
- lesser is dislocation density in cold working
- dislocation density in cold working remains same
- none of the above
Q24 | the mechanism of plastic deformation in polycrystalline material is than the mechanism in single crystal structure
- simpler
- complex
- same
- random
Q25 | the stress required to produce same deformation is higher in case of polycrystalline material as compared to polycrystalline materials
- coarse garined, fine grained
- fine grained, coarse grained
- a or b
- none of the above