Question
Identify the conductor having the highest resistivity.
This question was previously asked in
RRB ALP 2018 CBT 2 Fitter Question Paper (21-Jan-2019) (Shift 3)
The correct answer is
Mercury
Identifying Highest Resistivity Conductor
The question asks to identify the conductor with the highest resistivity among the options: Copper, Silver, Aluminium, and Mercury.
Resistivity (\( \rho \)) quantifies how strongly a material opposes electric current. Higher resistivity means lower conductivity.
Below are the approximate resistivity values for the given conductors at 20°C:
| Material | Resistivity (\( \rho \)) in \( \Omega \cdot m \) |
| Silver | \( 1.59 \times 10^{-8} \) |
| Copper | \( 1.68 \times 10^{-8} \) |
| Aluminium | \( 2.65 \times 10^{-8} \) |
| Mercury | \( 9.43 \times 10^{-7} \) |
Conductor Resistivity Comparison
By comparing the resistivity values:
- Silver, Copper, and Aluminium exhibit very low resistivities, characteristic of good electrical conductors.
- Mercury's resistivity (\( \approx 9.43 \times 10^{-7} \ \Omega \cdot m \)) is significantly higher than that of Silver, Copper, and Aluminium (which are in the order of \( 10^{-8} \ \Omega \cdot m \)).
Mercury has the highest resistivity among the listed conductors.
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Important Questions from Resistivity of Various Materials
Which of the following graph correctly represents the variation of resistivity 's' with temperature 'T' for a semiconductor material ?
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