The unit of temperature coefficient of resistivity is
Correct answer: B. 1/K
- A. 1/C
- B. 1/K
- C. 1/A
- D. 1/s
Explanation
The coefficient is the fractional change in resistivity per unit rise in temperature, so the resistivity units cancel and only reciprocal temperature remains, giving per kelvin. Because a kelvin and a degree Celsius are the same size, per degree Celsius is numerically identical, which is why the first option is such a close distractor. Reciprocal ampere and reciprocal second belong to quite different quantities.
This question appeared on the UHS MDCAT 2025 paper, which you can sit online with every answer explained.
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About Temperature Coefficient of Resistivity
Temperature coefficient of resistivity describes how a material's resistivity changes for each degree change in temperature. Questions use the relation between resistance, temperature and the coefficient, especially for metallic conductors with positive values and semiconductors with negative values. Resistivity is a material property, unlike resistance, which also depends on dimensions.
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