Final answer:
The statement about all gaseous conductive lamps having a positive-resistance characteristic is False. Conductive gaseous lamps, such as fluorescent lamps, can have a negative differential resistance and are not always positively resistive.
Step-by-step explanation:
The statement that all gaseous conductive lamps have a positive-resistance characteristic is False. Conductive gaseous lamps, like fluorescent bulbs, utilize gases that exhibit electrical discharge. These gases at times may show a negative differential resistance over a range of voltages, meaning that as voltage increases, the current may actually decrease. This is contrary to a positive resistance relationship where an increase in voltage would correspond to an increase in current as seen in typical resistive materials. Fluorescent lamps are more efficient and have much less resistance compared to traditional light bulbs that use a filament.
It is important to remember that all conductors do possess some level of resistance. However, the resistance characteristic can vary significantly depending on the conductor's material and environmental factors, such as in the case of gaseous conductors in lighting.