Analog Electronics
The ICBO is the electric current that flows when some DC voltage is applied

  in the forward direction to the emitter junction with collector open.
  in the reverse direction to the collector junction with emitter open.
  in the forward direction to the collector junction with emitter open.
  in the reverse direction to the emitter junction with collector open.

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Analog Electronics
Pinch-off voltage in a JFET is

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

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