11. Which material may also be considered a semiconductor element?
(a) carbon
(b) ceramic
(c) mica
(d) argon
12. Which semiconductor material is made from coal ash?
(a) germanium
(b) silicon
(c) tin
(d) carbon
13. Elements with 1, 2, or 3 valence electrons usually make excellent:
(a) conductors
(b) semiconductors
(c) insulators
(d) neutral
14. Solid state devices were first manufactured during:
(a) World War 2
(b) 1904
(c) 1907
(d) 1960
15. How many valence electrons are in every semiconductor material?
(a) 1
(b) 2
(c) 3
(d) 4
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