Analog Electronics
The silicon transistor are more widely used than germanium transistors because

  they have smaller depletion layer.
  they have better ability to dissipate heat.
  they have larger electric current carrying capacity.
  they have smaller leakage current.

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Analog Electronics
The typical input stage of an opamp has a

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

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