Physics Current Electricity KU 2024
PMDC Verified Question 7 of 112
The I-V Graph for a non-Ohmic material is always ____.
A
Curved
B
Horizontal
C
Linear
D
Perpendicular
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Curved
Concept:

Ohm's Law relies on a linear relationship between voltage and current.

Solution:

  • If a material is non-Ohmic, its resistance (\( R = V/I \)) fluctuates dynamically depending on the current passing through it or the applied voltage (like in a diode or a hot filament bulb).


  • Because the ratio changes constantly, the slope of the graph changes continuously, which visually manifests as a Curved line rather than a straight one.


Why other options are incorrect:

  • Opt C: Defines a perfect Ohmic material.


  • Opt B & D: Represent impossible/extreme scenarios of zero or infinite resistance continuously.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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