Top 1000+ Solved Material Science MCQ Questions Answer
Q. surface defects increase and decrease
a. hardness & strength
b. hardness and electrical conductivity
c. hardness and corrosion resistance
d. none of the above
Q. vacancies are known as _
a. one dimensional defect
b. zero dimensional defect
c. two dimenstiona l defect
d. none of the above
Q. dislocations are known as
a. one dimensional defect
b. zero dimensional defect
c. two dimenstiona l defect
d. none of the above
Q. in positive edge dislocation
a. extra row of atoms is present in the upper region
b. extra row of atoms is present in lower region
c. any one of above
d. none of the above
Q. in positive edge dislocation
a. the region in dislocation is under
b. the region in dislocation is under
c. the region in dislocation is under
d. none of the above
Q. the dislocations are classified as
a. edge dislocation
b. screw dislocation
c. positive and negative edge dislocation
d. all of the above
Q. in screw dislocation
a. the region in dislocation is under tension and below is under compression
b. the region in dislocation is under compression and below is under tension
c. the region in dislocation is under shear
d. none of the above
Q. when the metal is stresses below its elastic limit, the resulting deformation is
a. permenant
b. temporary
c. partially permenant
d. none of the above
Q. when the metal is stresses above its elastic limit, the resulting deformation is
a. permenant
b. temporary
c. partially permenant
d. a or c
Q. stress required during plastic deformation is than that required during elastic deformation
a. equal
b. high
c. low
d. b or c
Q. different shapes can be permentaly given to metals by virtue of property
a. elastic
b. plastic
c. none of the above
d. both a and b
Q. mechannnial properties of the metalafter plastic deformation
a. increases
b. either increase or decrease
c. remains constant
d. none of the above
Q. the plastic deformation can takes place through
a. slip
b. twinning
c. combination of slip and twinning
d. all of the above
Q. slip is defined as displacement of one part of crystal relative to other
a. tensile
b. compressive
c. shear
d. bending
Q. slip takes place due to
a. stress applied on material
b. chemical reaction within material
c. atmospheric reaction
d. none of the above