On This Page
This set of Material Science Multiple Choice Questions & Answers (MCQs) focuses on Material Science Set 6
Q1 | burgers vector
- is a measure of lattice distortion
- is a measure of lattice distortion and is measured as distance along the close packed directions
- stacking faults
- none of the above
Q2 | a measure of lattice distortion which is measured as a distance along the close packed directions
- burgers vector
- barbas vector
- any one of above
- none of the above
Q3 | the magnitude of lattice distortion in edge dislocation si near the dislocation as compared to region away from dislocation
- constant
- lower
- higher
- varies randomly
Q4 | the magnitude of edge dislocation in a lattice structure can be measured by
- miller indices
- burgers vector
- microscope
- none of the above
Q5 | linear defects increase and Decrease
- hardness, electrical conductivity
- electrical conductivity, hardness
- hardness, electrical resistance
- electrical resistance, hardness
Q6 | surface defects are
- one dimensional defect
- two dimensional defect
- theree dimensional defect
- none of the above
Q7 | surafec defects are associated with
- defects within same crystal structure with different orientation of atomic planes
- defects within adjacent region consisting of different crystal structure
- defects within adjacent region consisting of same crystal structure
- any of the above
Q8 | the surface defects are introduced in the material during of material
- solidificatio n
- heat treatment
- plastic deformation
- all of the above
Q9 | the is defect that causes sepeartion of grain
- grain boundary
- twin boundary
- stacking faults
- none of the above
Q10 | a garin boundary represents
- one dimensional defect
- zero dimensional defect
- two dimenstiona l defect
- none of the above
Q11 | a garin boundary is a transition region which represents _
- imperfectio ns in arrengement of atoms
- foreign atom located in th region
- region with unique crystal structure
- none of the above
Q12 | the defect which has mirror image of atomic arrangement across the dislocation is called
- grain boundary defect
- stacking faults
- low angle boundary defect
- twin boundary defect
Q13 | the twin is the region
- before and after the dialocation
- between the atomic arrangmnets that has formed mirror image
- low angle boundary defect
- twin boundary defect
Q14 | in a given material adjacent grains will have
- same crystal structure
- different crystal
- same crystal structure
- a or b
Q15 | the defect associated with slight mismatch of crystalline orientation from one grain to adjacent grain is called
- gtrain boundaries defect
- twinn boundaries defect
- low angle boundary defect
- stacking faults
Q16 | the low angle boundary defect is assocaited with
- high mismatch of crystalline orientation from one grain to adjacent grain
- slight mismatch of crystalline orientation from one grain to adjacent grain
- stacking mismatch of atomic planes
- stacking faults
Q17 | the stacking fault defect is assocaited with
- erroe in sequence of close- packed atomic planes
- slight mismatch of crystalline orientation from one grain to adjacent grain
- error in stacking of electrons in atomic structure
- none of the above
Q18 | surface defects increase and decrease
- hardness & strength
- hardness and electrical conductivity
- hardness and corrosion resistance
- none of the above
Q19 | vacancies are known as _
- one dimensional defect
- zero dimensional defect
- two dimenstiona l defect
- none of the above
Q20 | dislocations are known as
- one dimensional defect
- zero dimensional defect
- two dimenstiona l defect
- none of the above
Q21 | in positive edge dislocation
- extra row of atoms is present in the upper region
- extra row of atoms is present in lower region
- any one of above
- none of the above
Q22 | in positive edge dislocation
- the region in dislocation is under
- the region in dislocation is under
- the region in dislocation is under
- none of the above
Q23 | the dislocations are classified as
- edge dislocation
- screw dislocation
- positive and negative edge dislocation
- all of the above
Q24 | in screw dislocation
- the region in dislocation is under tension and below is under compression
- the region in dislocation is under compression and below is under tension
- the region in dislocation is under shear
- none of the above
Q25 | when the metal is stresses below its elastic limit, the resulting deformation is
- permenant
- temporary
- partially permenant
- none of the above