Doubt & Answer Explanation

Answer Explanation

All materials have an associated conductivity or resistivity. A chunk of silicon (which is a semi-conductor) has some resistivity, and if you attach wires to just a plain block of silicon, it will have an associated resistance and will obey ohms law.  On the other hand, however, semiconductor-based DEVICES may not obey Ohm's law in the context of some circuit.

Due to advantageous properties of semiconductors, they are "doped" and we can create nonlinear devices (devices in which ohm's law is not obeyed) which do not obey ohms law.

We can thus say that Ohms law does not apply for two-terminal circuits which are "non-linear", like semiconductor devices, thermistors, etc. They have their own "laws" which describe the relationship between current and voltage. However it is applicable for semiconductor chunks or any body which has a fixed resistance of its own.