Question

Match the following based on the electrical properties of a conductor.

• A. Zero resistance
• B. Decrease in resistance
• C. Variable resistance
• D. Increase in resistance

Answer 1

Since, resistance, $R=\frac{\rho L}{A}$
It infers that
$R\propto L$ and $R\propto \frac{1}{A}$
As the length of the conductor increases, the resistance of the conductor also increases. The resistance decreases when the area is increased.
Superconductors are materials which have zero resistance to flow of current through them.
Non-ohmic devices are those which do not obey ohm's law, i.e. their resistance is always variable.