Linear Defects – 2 MCQ’s

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This set of Materials Science Multiple Choice Questions & Answers (MCQs) focuses on “Linear Defects – 2″.

1. Edge dislocation and skew dislocation are linear crystalline defects.
a) True
b) False

2. Which of the following statement is false?
a) Burger vector is the right angle to edge dislocation
b) In screw defect the line defect is parallel to the displacement vector
c) Grain boundary defect is a type of line defect
d) Line defect occurs during the recrystallization process or during slip

3. Which type of defect are line defects?
a) One-dimensional defect
b) Zero-dimensional defect
c) Two-dimensional defect
d) Three-dimensional defect

4. In which type of dislocation an extra plane is inserted inside the crystal?
a) Edge dislocation
b) Screw dislocation
c) Jog dislocation
d) Mixed dislocation

5. To determine yield strength of a material which of the following needn’t be affected?
a) Solute hardening
b) Precipitation hardening
c) Work hardening
d) Martensic transformation

6. In an edge dislocation, a helical path is traced around the dislocation line.
a) True
b) False

7. What is the difference between the angle of Burgers vector and dislocation line in edge dislocation and screw dislocation?
a) -90 degrees
b) 0 degrees
c) 45 degrees
d) 90 degrees

8. In which type of dislocation planes are displaced relative to each other through shear?
a) Edge dislocation
b) Screw dislocation
c) Jog dislocation
d) Mixed dislocation

9. Which of the following is fields are not present for edge dislocation?
a) Tensile
b) Compressive
c) Shear stress
d) Strain

10. Which of the following dislocation can glide but not climb?
a) Screw dislocation
b) Edge dislocation
c) Jog dislocation
d) Mixed dislocation

11. Which of the following can be theoretical shear stress produced in metals? ( GPa stands for Giga pascal)
a) 10 GPa
b) 32 GPa
c) 2 GPa
d) 50 GPa

12. Which of the following is fields are present for screw dislocation?
a) Tensile
b) Compressive
c) Shear stress
d) Strain

13. What are the dislocation in which the line direction and Burgers vector are neither perpendicular nor parallel?
a) Screw dislocation
b) Edge dislocation
c) Jog dislocation
d) Mixed dislocation

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