- 1(current)
Q. No.Choose the correct alternative.
| 1. | Alloys of metals usually have less resistivity than that of their constituent metals. |
| 2. | Alloys usually have much higher temperature coefficients of resistance than pure metals. |
| 3. | The resistivity of the alloy manganin is nearly independent with an increase of temperature. |
| 4. | The resistivity of a typical insulator (e.g., amber) is less than that of a metal by a factor of the order of 10 22 / 10 23 . |
Subtopic: Â Derivation of Ohm's Law |
 53%
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A negligibly small current is passed through a wire of length \(15~\text{m}\) and uniform cross-section \(6.0\times10^{-7}\) m2, and its resistance is measured to be \(5.0~\Omega.\) What is the resistivity of the material at the temperature of the experiment?
| 1. | \(1\times 10^{-7}~\Omega\text{m}\) | 2. | \(2\times 10^{-7}~\Omega\text{m}\) |
| 3. | \(3\times 10^{-7}~\Omega\text{m}\) | 4. | \(1.6\times 10^{-7}~\Omega\text{m}\) |
Subtopic: Â Derivation of Ohm's Law |
 87%
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A silver wire has a resistance of \(2.1~\Omega\) at \(27.5^\circ \text{C},\) and a resistance of \(2.7~\Omega\) at \(100^\circ \text{C}.\) The temperature coefficient of resistivity of silver is:
1. \(0.0033^\circ \text{C}^{-1}\)
2. \(0.039^\circ \text{C}^{-1}\)
3. \(0.0039^\circ \text{C}^{-1}\)
4. \(0.033^\circ \text{C}^{-1}\)
Subtopic: Â Derivation of Ohm's Law |
 64%
From NCERT
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- 1(current)
Q. No.
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