Q1. [1] straightforward exam-ready
The resistivity of a material depends on:
(A) the length of the conductor
(B) the area of cross-section of the conductor
(C) the nature of the material and temperature
(D) both the length and area of cross-section
- A the length of the conductor
- B the area of cross-section of the conductor
- C the nature of the material and temperature
- D both the length and area of cross-section
Generated by claude-sonnet-4-6 · 2026-06-26 01:08 · grounding rag
Model Answer
(C) the nature of the material and temperature
Resistivity (ρ) is a characteristic property of the material and varies with temperature. It does not depend on the length or area of cross-section of the conductor.
Source: Chapter 11, Section 11.5
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Explanation
- Resistance depends on length, area, and material — but resistivity (ρ) is an intrinsic property that depends only on the nature of the material and temperature.
- The textbook states: "It (ρ) is a characteristic property of the material. Both the resistance and resistivity of a material vary with temperature."
- Examiners specifically test whether students can distinguish between resistance (which depends on dimensions) and resistivity (which does not). Option C is the only correct choice.