26. Which of the following cannot actually move?
(a) majority carriers
(b) ions
(c) holes
(d) free electrons
27. When and who discovered that more than one transistor could be constructed on a single piece of semiconductor material:
(a) 1949, William Schockley
(b) 1955, Walter Bratten
(c) 1959, Robert Noyce
(d) 1960, John Bardeen
28. Atoms that normally have three electrons in their outer shell are called __________________ atoms.
(a) trivalent
(b) pentavalent
(c) tetravalent
(d) charged
29. Reverse bias is a condition that essentially ___________ current through the diode.
(a) allows
(b) prevents
(c) increases
(d) blocks
30. A(n) ________ is the simplest of semiconductor devices.
(a) diode
(b) transistor
(c) operational amplifier
(d) SCR
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