An ohmmeter used to test for front-to-back resistance of a PN junction diode should produce roughly what ratio?

Correct Answer: Option B — 100:1

A functional PN junction diode exhibits low resistance when forward-biased and extremely high resistance when reverse-biased. A ratio of approximately 100:1 is a standard benchmark for verifying that the semiconductor junction is intact and not shorted or open, ensuring proper operation in rectification or signal circuits.