14. Which of the following is not a type of microscopy? a. Optical b. SEM c. XRD

Question

14. Which of the following is not a type of microscopy?

a.     Optical

b.     SEM

c.     XRD

d.     AFM

e.     TEM

15. Which primary type of bonding do you expect to have for LiF?

a.     Covalent

b.     Ionic

c.     Metallic

d.     Van der Waals

e.     Hydrogen Bonding

16. Which properties correlate positively with bonding energy?

a.     Melting Temperature

b.     Yield Stress

c.     Toughness

d.     Hardness

e.     None of the above

17. Which of the following is an example of a planar defect?

a.     Dislocation

b.     Vacancy

c.     Precipitate

d.     Grain Boundary

18. Which has the most dense packing of atoms in the unit cell (highest atomic packing factor possible)?

a.     BCC

b.     HCP

c.     Simple Cubic

19. Measurement of grain size uses

            a. the average diameter of each grain.

            b. the average radius of each grain

            c. the volume of each grain.

Explanation / Answer

14) Answer: c. XRD

15) Answer: b. Ionic

16) Answer a,b,c,d

The properties like melting temperature, yield stress, toughness and hardness are all associated with the movement of the atoms in the material. Since the movement of atoms is governed by the bonding energy, they all have a positive correlation with bonding energy.

17) Answer d. Grain Boundary

18) Answer b. HCP

19) Answer a. the average diameter of each grain

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