Analog Electronics
In MOSFET devices the N-channel type is better the P-channel type in the following respects

  it has better noise immunity.
  it is TTL compatible.
  it has better drive capability.
  it is faster.

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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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