Analog Electronics
For a reverse biased pn junction, the electric current through the junction increases abruptly at

  0.2 eV.
  0 V.
  7.2 eV.
  breakdown voltage.

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Analog Electronics
When a transistor is connected in common emitter mode, it with have

Negligible input resistance and high output resistance
High input resistance and low output resistance
Low input resistance as well as output resistance
Medium input resistance and high output resistance

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