Ohm's Law — MCQ Practice

A potential difference of $10\,\text{V}$ is applied across a conductor, and a current of $2\,\text{A}$ flows through it. If the potential difference is increased to $25\,\text{V}$ while keeping the temperature constant, what will be the new current flowing through the conductor?

A wire of resistance $R$ is stretched to twice its original length. Assuming its volume remains constant, what will be its new resistance?

Which of the following V-I graphs represents an Ohmic conductor?

A resistor has a resistance of $100,\Omega$ at $20^\circ C$. Its temperature coefficient of resistance is $0.005,^\circ C^{-1}$. What will be its resistance at $120^\circ C$?

Two wires A and B are made of the same material and have the same mass. Wire A has a length $L$ and cross-sectional area $A$. Wire B has a length $2L$. What is the ratio of the resistance of wire B to wire A ($R_B/R_A$)?

Which of the following statements about Ohm's Law is INCORRECT?