True or False - All gaseous conductive lamps have a positive-resistance characteristic.

Gaseous conductive lamps, such as fluorescent and neon lamps, generally exhibit a negative-resistance characteristic at certain operating points. This is primarily due to their reliance on gas ionization to conduct electricity; when a certain voltage is exceeded, the current increases disproportionately compared to the voltage, leading to what is known as a negative resistance region.

In contrast, a positive-resistance characteristic means that as voltage increases, current also increases linearly, which is not the case for most gaseous conductive lamps under certain conditions. Therefore, it is accurate to state that not all gaseous conductive lamps have a positive-resistance characteristic, making the statement false.