The plot of current \(I~\text{(A)}\) flowing through a metallic conductor versus the applied voltage \(V~\text{(volt)}\) across the ends of a conductor is:

1.   2.
3. 4.
Subtopic:  Derivation of Ohm's Law |
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A certain wire \(A\) has resistance \(81\) \(\Omega\). The resistance of another wire \(B\) of the same material and equal length but of diameter thrice the diameter of \(A\) will be:
1. \(81\) \(\Omega\) 2. \(9\) \(\Omega\)
3. \(729\) \(\Omega\) 4. \(243\) \(\Omega\)
Subtopic:  Derivation of Ohm's Law |
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On the basis of electrical conductivity, which one of the following material has the smallest resistivity?
1. Germanium 
2. Silver
3. Glass
4. Silicon 
Subtopic:  Derivation of Ohm's Law |
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As the temperature of a metallic resistor is increased, the product of its resistivity and conductivity:

1. increases
2. decreases
3. remains constant
4. may increase or decrease
Subtopic:  Derivation of Ohm's Law |
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The reciprocal of resistance is:
1. reactance 2. mobility
3. conductivity 4. conductance
Subtopic:  Derivation of Ohm's Law |
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The resistance of platinum wire at \(0^{\circ} \text{C}\) is \(2~ \Omega\) and \(6.8~ \Omega\) at \(80^{\circ}\text{C}\). The temperature coefficient of resistance of the wire is:
1. \((3\times 10^{-1})^\circ \text{C}^{-1}\) 2. \((3 \times 10^{-4})^\circ \text{C}^{-1}\)
3. \((3 \times 10^{-3})^\circ \text{C}^{-1}\) 4. \((3 \times 10^{-2})^\circ \text{C}^{-1}\)
Subtopic:  Derivation of Ohm's Law |
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