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This set of Material Science Multiple Choice Questions & Answers (MCQs) focuses on Material Science Set 14
Q1 | Positive screw dislocation is represented by
- ┴
- 0
- ┬
Q2 | Recrystallisation temperature of Iron is………..
- 727 °c
- 775 °c
- 800 °c
- 700 °c
Q3 | Recrystallization rate varies in the following manner with temperature
- linearly increasing
- linearly decreasing
- exponential
- logarithmic
Q4 | Repeatable entity of a crystal structure is known as
- crystal
- lattice
- unit cell
- miller indices
Q5 | Requirement for cross-slip movement of dislocation
- preferred slip plane
- preferred slip direction
- no preferred slip plane
- no preferred slip direction
Q6 | Round brackets are used to represent crystallographic
- point location
- direction
- plane
- none of the above
Q7 | Schottky defect found in
- metal
- non-metal
- ionic
- plastics
Q8 | Schottky defect have missing of
- cation
- anion
- electron
- both a&b
Q9 | Schottky-defect in ceramic material is
- interstitial impurity
- vacancy- interstitial pair of cations
- pair of nearby cation and anion vacancies
- substitution al impurity
Q10 | Schottky-defect is of this type.
- point
- line
- volume
- surface
Q11 | screw dislocations have burger vectorfor dislocation line
- perpendicul ar
- parallel
- inclined
- first perpendicul ar then parallel
Q12 | screw dislocations includes
- tension lattice strain
- compression lattice strain
- shear lattice strain
- all
Q13 | Sharp break in dislocation line that is in slip plane .
- jog
- kink
- either jog or kink
- none
Q14 | slip plane orientation after grain boundary
- by pass
- crosses
- change
- none of the above
Q15 | Slip systems having two types one is glide& another one is
- climb
- slip
- twinns
- none of the above
Q16 | Square brackets are used to represent crystallographic
- point location
- direction
- plane
- none of the above
Q17 | Stacking fault energies are in the range of
- 0.01-0.1j/m2
- 0.01-0.1j/cm2
- 0.1-10 j/m2
- 0.1-10 j/m2
Q18 | Stacking fault is type of defect
- point
- line
- volume
- surface
Q19 | Surface decarburisation in steels in cold working .
- does not occurs
- occurs
Q20 | Surface decarburisation in steels in hot working .
- does not occurs
- occurs
Q21 | Surface finish is good in
- hot working
- cold working
- both a and b
- can’t say
Q22 | Surface finish is poor in
- hot working
- cold working
- both a and b
- can’t say
Q23 | Temp. required for cold working is
- above 100°c
- below 100°c
- below recrystalliza tion
- above recrystalliza tion
Q24 | Temp. required for hot working is
- above 100°c
- below 100°c
- below recrystalliza tion
- above recrystalliza tion
Q25 | The arrangement of multiple unit cells together is called
- crystal structure
- unit cell
- lattice constant
- lattice angle