Q.1
What is the order of core energy?
  • a) 0.5 – 1.5 eV
  • b) 0.1 – 1.0 eV
  • c) 2.0 – 4.0 eV
  • d) 3.0 – 10 eV
Q.2
Which statement is true regarding screw and edge dislocation?
  • a) Screw and edge dislocation both show non-symmetry
  • b) Screw and edge dislocation both are equally symmetric
  • c) Symmetry of edge dislocation is greater than screw dislocation
  • d) Symmetry of screw dislocation is greater than edge dislocation
Q.3
What is the ratio of elastic strain energy per unit length of an edge dislocation and screw dislocation?
  • a) 1:1
  • b) 1:2
  • c) 2:3
  • d) 3:2
Q.4
Elastic strain energy of screw dislocation is ____ of that of edge dislocation for unit length?
  • a) Higher
  • b) Lesser
  • c) Equal
  • d) Half
Q.5
Elastic energy of a dislocation is _____ the Burgers vector.
  • a) Directly proportional to
  • b) Proportional to the square of
  • c) Not dependent on
  • d) Proportional to the square root of
Q.6
The stability of dislocations ____ with an increase in the Burgers vector.
  • a) Increases
  • b) Decreases
  • c) Remains constant
  • d) Increases then decrease
Q.7
What is the expression for the force required to bend the dislocation to radius R?
  • a) Gb/2R
  • b) Gb/R
  • c) GbR
  • d) Gb2/R
Q.8
What is the percentage contribution of elastic strain in the total energy of dislocation?
  • a) 10%
  • b) 30%
  • c) 70%
  • d) 90%
Q.9
Elastic strain energy _____ with an increase in length.
  • a) Increases
  • b) Decreases
  • c) Remains constant
  • d) Increases then decrease
Q.10
Line tension (T) is _____
  • a) ∝ b
  • b) ∝ b1/2
  • c) ∝ b2
  • d) ∝ b3
Q.11
A dislocation can avoid obstacles by a glide.
  • a) True
  • b) False
Q.12
As a distance between precipitate particles increases, shear stress to bend dislocation decreases.
  • a) True
  • b) False
0 h : 0 m : 1 s