Which of the following statements is not true?

The correct answer is Option (3) → Semiconductors obey Ohm's law.

Analysis of statements:

→ Conductance $G = 1/R$ → True

→ Ohm's law fails at very low and very high temperatures for conductors → True

→ Semiconductors generally do not obey Ohm's law strictly because their resistance changes with voltage and temperature → Not True

→ Ohm's law is not applicable to electron tubes, discharge tubes, electrolytes → True

∴ Statement not true: Semiconductors obey Ohm's law.