第一章测试1.
Which of the following is not a commonly used semiconductor material'? （ ）
A:germanium B:silicon C:carbon D:lead
答案:D
2.
The characteristic of an ideal diode are those of a switch that can conduct current（ ） .
A:in both directions but in only one direction at a time B:in one direction only C:depends on the circuit it is used in 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:increase C:make the resistance stable against variation due to temperature
答案:A
4.
The piecewise linear model, equivalent circuit of the diode consists of （ ）.
A:a battery, a small resistor, and the ideal diode B:a junction capacitor, a battery, a small resistor, and the ideal diode C:a battery and the ideal diode D:the ideal diode
答案:A
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:high C:constantly changing D:low
答案:B
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