8. The tape for sealing pipe joints is generally made of
A. ABS
B. Teflon
C. PVC
D. epoxy resin
9. The energy required to liberate an electron from an atom is called
A. kinetic energy
B. potential energy
C. excitation energy
D. ionization energy
10. A germanium atom contains
A. 2 orbiting electrons
B. two protons
C. four valence electrons
D. six valence electrons
11. A silicon atom contains
A. 2 valence electrons
B. 2 protons
C. 4 valence electrons
D. 6 valence electrons
12. The valence electrons are
A. free electrons
B. outer orbit electrons
C. inner core electrons
D. located in the nucleus
13. In n-type germanium, each donor atom contributes.
A. one free electron
B. 2 free electrons
C. free electrons
D. 3 free electrons
14. In n-type silicon, each donor atom contributes
A. one free electron
B. 2 free electrons
C. 3 free electrons
D. 4 free electrons
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