Analog Electronics
Input impedance of MOSFET is

  less than that of FET and BJT.
  less than of FET but more than BJT.
  more than that of FET and BJT.
  more than that of FET but less than BJT.

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Analog Electronics
Optocouplers combine

  Infrared light emitting diode and a silicon photo transistor.
 SITs and BJTs.
 Power transistor and silicon transistor.
 IGBTs and MOSFETs.

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