1. A semiconductor in its purest form is called a. Pure semiconductor b. Doped semiconductor c. Intrinsic semiconductor d. Extrinsic semiconductor 2. Valence orbit is the other form for a. Outer orbit b. 3rd orbit c. 4th orbit d. 2nd orbit 3. There are two mechanisms by which holes and electrons move through a silicon crystal. They are a. Covalent bond and recombination b. Diffusion and drift c. Free and charge particles d. Forward and reverse bias 4. What orbit controls the electrical property of the atom? a. Valence orbit b. First orbit c. Fourth orbit d. M shell 5. Pure silicon crystal atoms contain how may valence electrons as a result of covalent bonding? a. 1 b. 4 C. 8 d. 16 6. Diffusion or storage capacitance is the term used to refer to a. The reverse bias capacitance of a diode b. The forward bias capacitance of a diode c. The breakdown capacitance of a zener diode 7. What is considered as the key electrical conductivity? a. The number of electrons in the valence orbit b. The number of protons in the nucleus c. The number of neutrons in the nucleus d. The number of protons plus the number of electrons in the atom 8. A silicon crystal is an intrinsic semiconductor a. If every atom in the crystal is a silicon atom b. If majority of the atoms in crystal is a silicon atom c. If the crystal contains 14 silicon atoms d. If the crystal is undoped