Analog Electronics
The common-source JFET amplifier has

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

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Analog Electronics
In a transistor amplifier, the reverse saturation electric current ICO

  double for every 5° rise in temperature.
  double for every 1° rise in temperature.
  increase linearly with the temperature.
  double for every 10° rise in temperature.

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