Learning Unit One
Quiz 1
Test what you have learned by answering the following questions:

1. The x-, y-, and z intercepts of a plane are 2,1, and 3. Its Miller Indices are

(3,6,2)
 (3,6,1)
 (2,1,3)
 (2,6,3)

2. A plane is parallel to an axis. What is its Miller Index?

Infinity
 0
 1

3. We use Miller Indices because:

Miller indices are almost always small
 Using reciprocals spares us the complication of infinite intercepts.
 Device properties can depend on the orientation of the crystal lattice.
4. The only element known to form a simple cubic lattice is

Lead
 Radium
 Polonium
 Sodium chloride
5. How many atoms per conventional cell does Simple Cubic Lattice have?
1
 2
 3
 4
6. How many atoms per conventional cell does face centered cubic lattice have?
1
 2
 3
 4
7. How many atoms per conventional cell does body centered cubic lattice have?
1
 4
 2
 8
8. How many atoms per conventional cell does tetrahedral structure have?
1
 2
 4
 8
9. Carbon and silicon have the following structure
Simple cubic
 Face centered structure
 Diamond structure
 Zincblende structure
10. The starting material for Czochralski crystal method is
Trichlorosilane
 Sand
 Electronic grade silicon (EGS)
11. EGS can be prepared from the pyrolysis of trichlorosilane?
True
 False
12. Electronic grade silicon (EGS) must have 99.99999999 % of purity.
True
 False
13. Any non-silicon atom incorporated into the lattice at either a substitutional or interstitial site is considered a

Line defets
 Planar defects
 Point defects
 Volume defects
14. Which of the following are line defects
Twins
 Screw
 Grain boundaries
 Schottky defect
15. Precipitates of impurity or dopant atoms constitute area defects.
True
 False
16. Retrograde solubility is defined as a solubility that decreases with decreasing temperature.
True
 False
17. Dislocations will form if thermal stress exceeds the yield strength of the silicon
True
 False