Materials Science Mock Test 3

10%

Question 1 of 10

1. What are the dislocation in which the line direction and Burgers vector are neither perpendicular nor parallel?

Mixed dislocation

Screw dislocation

Edge dislocation

Jog dislocation

Question 1 of 10

Question 2 of 10

2. Which of the following is fields are present for screw dislocation?

Compressive

Shear stress

Strain

Tensile

Question 2 of 10

Question 3 of 10

3. What is the density of polycrystalline specimen virtually identical to?

Different crystal of different material

Singe crystal of different material

Different crystal of same material

Single crystal of same material

Question 3 of 10

Question 4 of 10

4. You want to demonstrate the phenomenon of diffusion to a group of school kids using two coloured gases. For this, you need to slow down the process. Which of the following tricks will help you achieve this feat?

Using gases of large molecular weights

Cooling the gases

All of the mentioned

Decreasing the size of orifice

Question 4 of 10

Question 5 of 10

5. Which of the following statement is false?

Line defect occurs during the recrystallization process or during slip

Burger vector is the right angle to edge dislocation

In screw defect the line defect is parallel to the displacement vector

Grain boundary defect is a type of line defect

Question 5 of 10

Question 6 of 10

6. Which of the following phenomenon creates point defect in ceramics?

Densification

Precipitation

Electrical conductivity

Thermal excitation

Question 6 of 10

Question 7 of 10

7. Concentration gradient refers to:

Change of concentration with respect to temperature

Change of concentration with respect to time

Change of concentration with respect to space

None of the mentioned

Question 7 of 10

Question 8 of 10

8. Diffusion is not used in which of the following?

Manufacturing of alloys

Doping of semiconductors

Heat treatment of metals

Catalysis

Question 8 of 10

Question 9 of 10

9. In steady state diffusion, which of the following remain unchanged with time?

Concentration profile

Concentration at sink

All of mentioned

Concentration at source

Question 9 of 10

Question 10 of 10

10. Edge dislocation and skew dislocation are linear crystalline defects.

False

True

Question 10 of 10