Analog Electronics
Pinch-off voltage in a JFET is

 the drain voltage that gives zero drain current.
 the gate to source voltage that gives unity drain current.
 the gate to source voltage that gives zero drain current.
 the drain voltage that gives infinite drain current.

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Analog Electronics
The common-source JFET amplifier has

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

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