Silicon atoms combine into an orderly pattern called a: 

(a) Covalent bond 

(b) Crystal 

(c) Semiconductor 

(d) Valence orbit 

How many valence electrons are in every semiconductor material? 

(a) 1 

(b) 2 

(c) 3 

(d) 4 

In "n" type material, majority carriers would be: 

(a) Holes 

(b) Dopants 

(c) electrons 

When an electron jumps from the valence shell to the conduction band, it leaves a gap. What is this gap called? 

(a) Energy gap 

(b) Hole 

(c) Electron hole pair 

(d) Band gap 

What electrical characteristic of intrinsic semiconductor material is controlled by the addition of impurities? 

(a) Conductivity 

(b) Resistance 

(c) Power 

(d) all of the above