第一章测试1.
Which of the following is not a commonly used semiconductor material'? （ ）
A:lead B:silicon C:carbon D:germanium
答案:A
2.
The characteristic of an ideal diode are those of a switch that can conduct current（ ） .
A:depends on the circuit it is used in B:in one direction only C:in both directions but in only one direction at a time D:in both directions
答案:B
3.
When a diode is doped with either a pentavalent or a trivalent impurity its resistance will （ ） .
A:decrease B:make the resistance stable against variation due to temperature C:increase
答案:A
4.
The piecewise linear model, equivalent circuit of the diode consists of （ ）.
A:the ideal diode B:a battery and the ideal diode C:a battery, a small resistor, and the ideal diode D:a junction capacitor, a battery, a small resistor, and the ideal diode
答案:C
5.
When a p-n junction is reverse-biased, its junction resistance is （ ）.
A:determined by the components that are external to the device B:constantly changing C:high D:low
答案:C
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