Analog Electronics
The arrow direction in diode symbol indicates

  direction of electron flow.
  direction of hole flow.
  none of these.
  opposite to the direction of hole flow.

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Analog Electronics
A working diode must have

 High resistance when forward or reverse biased
 Low resistance when forward biased, while high resistance when reverse bias
 High resistance when forward biased, while low resistance when reverse bias
 Low resistance when forward or reverse biased

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