Q. No.Ammeter and voltmeter readings were recorded as \(0.5~\text{A}\) and \(1~\text{V}\) during the experiment to determine the resistance of a given wire using Ohm's law. The correct value of the resistance is:
1. \(1 ~\Omega\)
2. \(10.5~ \Omega\)
3. \(2 ~\Omega\)
4. \(4.5~ \Omega\)
1. \(1 ~\Omega\)
2. \(10.5~ \Omega\)
3. \(2 ~\Omega\)
4. \(4.5~ \Omega\)
Subtopic: Â Derivation of Ohm's Law |
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The Ohm's law for a metallic conductor can be represented by:
1. \(\frac{\text { potential difference }}{\text { current }}=\text{resistance} \)
2. \( \text{current} = \text{resistance} \times \text{potential difference} \)
3. \(\text{current} =\frac{\text { resistance }}{\text { potential difference }} \)
4. \(\text{Both}~ (2)~ \text{and} ~(3)\)
1. \(\frac{\text { potential difference }}{\text { current }}=\text{resistance} \)
2. \( \text{current} = \text{resistance} \times \text{potential difference} \)
3. \(\text{current} =\frac{\text { resistance }}{\text { potential difference }} \)
4. \(\text{Both}~ (2)~ \text{and} ~(3)\)
Subtopic: Â Derivation of Ohm's Law |
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The shape of \(V\) vs \(I\) graph for an ohmic conductor is:
1. parabola
2. straight line
3. hyperbola
4. none of these
1. parabola
2. straight line
3. hyperbola
4. none of these
Subtopic: Â Derivation of Ohm's Law |
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For the given \(V-I\) graphs it can be concluded that:
1. \(R_1>R_2>R_3 \)
2. \(R_1<R_2>R_3 \)
3. \(R_1=R_2=R_3 \)
4. \(R_3>R_2>R_1\)
1. \(R_1>R_2>R_3 \)
2. \(R_1<R_2>R_3 \)
3. \(R_1=R_2=R_3 \)
4. \(R_3>R_2>R_1\)
Subtopic: Â Derivation of Ohm's Law |
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The resistance of a wire depends on:
| 1. | length of the wire |
| 2. | area of cross-section of the conductor |
| 3. | nature of material and temperature across the conductor |
| 4. | All of these |
Subtopic: Â Derivation of Ohm's Law |
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Given below are two statements:
| Assertion (A): | The conductance of a wire increases linearly with its cross-sectional area, but is inversely proportional to its length. |
| Reason (R): | The conductance is inverse of the resistance \((R)\) and, \(R=\rho\dfrac lA,\) where \(l=\) length, \(A\) = area of cross-section. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Â Derivation of Ohm's Law |
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The resistance of the conductor of unit length and unit area of cross-section is called:
1. conductance
2. capacitance
3. specific resistance
4. conductivity
1. conductance
2. capacitance
3. specific resistance
4. conductivity
Subtopic: Â Derivation of Ohm's Law |
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Given below are two statements:
| Assertion (A): | Alloys such as constantan and manganin are used in making standard resistance coils. |
| Reason (R): | Constantan and manganin have a very small value of temperature coefficient of resistance. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Â Derivation of Ohm's Law |
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A nichrome wire \(50~\text{cm}\) long and \(1~\text{mm}^{2}\) cross-section carries a current of \(4~\text{A}\) when connected to a \(2~\text{V}\) battery. The resistivity of nichrome wire is:
| 1. | \(1\times 10^{-6} ~\Omega-\text{m}\) |
| 2. | \(4\times 10^{-7}~\Omega-\text{m}\) |
| 3. | \(3\times 10^{-7}~\Omega-\text{m}\) |
| 4. | \(2\times 10^{-7}~\Omega-\text{m}\) |
Subtopic: Â Derivation of Ohm's Law |
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A negligibly small current is passed through a wire of length \(15~\text{m}\) and uniform cross-section \(6.0\times10^{-7}~\text{m}^2,\) 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 |
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Level 1: 80%+
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