Question: 1. Materials are characterized by: a. Macroscopic properties. b. Micro

ID: 893338 • Letter: Q

Question

Question:

1. Materials are characterized by:

a. Macroscopic properties. b. Microstructure. c. Atomic level composition. d. All of the above

2. Atoms are:

a. Discrete units of matter. b. An abstract concept. c. Found in fractional units. d. Crystallographic lattice points

3. The Burger’s vector describes:

a. Surface cracks. b. Crystal twinning. c. Dislocation geometry. d. The most direct route to McDonald’s

4. Cubic Close Packed (CCP) is another name:

for which of the following:

a. HCP. b. BCC. c. FCC. d. All of the above

5. Glass and ceramic materials tend to:

a. Fail catastrophically at low strain. b. Show ductility.

c. Deform plastically before failure. d. Have elastic moduli ~106 Pa

6. Solid state diffusion & vacancy generation:

a. Are completely unrelated. b. Are directly related.

c. Increase linearly with Temperature. d. Describe lattice point motion

7. Diffusion & heat transfer:

a. Are completely unrelated. b. Are directly related.

c. Increase linearly with Temperature. d. Have identical differential equations

8. A vacancy and a dislocation both:

a. Disrupt the crystal lattice. b. Represent partial occupancy

c. Contain ruptured bonds. d. Are low energy regions

9. Dislocations:

a. Are interstitial dopants. b. Are crystal defects

c. Require atomic impurities. d. Enhance plastic deformation

1. materials are characterised microstructure. The option is b.

2. atoms are discreate units of matter. The option is a.

3. burger's vector describes dislocation geometry of crystals. The option is c.

4. the another name for cubic closed packing (CCP) is FCC (face centered cubic). Both CCP and FCC have

cordination number 12, and atoms for unit cell is 4. thus, the correct option is c.

5 glass and ceramic materials tend to fail catastrophically at low strain. The correct option is a.

7. diffusion and heat transfer increas lineraly with temperature. The correct option is c.

8. vacancy and dislocation distrupt the crystal lattice. The correct option is a.

9. dislocations are crystal defects. The correct option is b.

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