Analog Electronics
A JFET can operate in

  depletion and enhancement mode only.
  none of these.
  depletion mode only.
  enhancement mode only.

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Analog Electronics
The typical input stage of an opamp has a

  differential input and differential output.
  single - ended input and single-ended output.
  differential input and single - ended output.
  single - ended input and differential output.

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