NEET Physics Resistance & Resistivity MCQ Question
Which of the following statements about resistance and resistivity is correct?
Resistance is directly proportional to the length of a conductor and inversely proportional to its cross-sectional area.
Insulators have lower resistivity compared to metals, making them better conductors.
The resistivity of metals increases with temperature, improving their conductivity.
Resistance is independent of the material from which the conductor is made.
Correct Answer
Detailed Explanation
According to the relation R = ρ(l/A), resistance depends on the length and cross-sectional area of the conductor, confirming statement A as correct. Metals have low resistivity, and their resistance typically increases with temperature rather than decreases.
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