Dislocation density for heavily deformed metals are approximately.

a$){10}^{3}m{m}^{-2}$

b$),{10}^{5}m{m}^2$

c$)10m{m}^{-2}$

d$){10}^{10}m{m}^2$

e$){10}^{20}m{m}^2$

Which of the following act as dislocation formation sites during plastic deformation.

a$)$ grain boundaries

b$)$ internal defects

c$)$ surface regularities

d$)$ all of the above

e$)$ none of the above

True or False

$11)$

$13)$

$14)$ For an edge dislocation in a face centered cubic material, which statement is not true.

a$)$ A tensile strain exists among the host atoms below the slip plane containing the extra half plane.

b$)$ The silp plane is from the $(101)$ family.

c$)$ There are $12$ operable slip systems available.

d$)$ The Burgers vector is parallel to the dislocation line.

e$)$ A compressive force exists in the region which contains the extra half plane.

When metals are plasticity deformed strain energy associated with dislocation is partially dissipated as heat.

Dislocation moves with the same degree of ease on all crystallographic planes and in all crystallographic directions.

HCP metals are normally more brittle than metals with FCC or BCC structure.

The dislocation density decreases during plastic deformation.