Analog Electronics
The common-source JFET amplifier has

  a high input impedance and a voltage gain less than 1.
  a high input impedance and a very high voltage gain.
  no voltage gain.
  a very high input impedance and a relatively low voltage

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Analog Electronics
The magnitude of electric current ICBO

  is generally greater in silicon than in germanium transistor.
  increases with the increase in temperature.
  depends largely upon emitter-base junction base potential.
  depends largely upon the emitter doping.

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