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Q. No.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 |
79%
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Given below are two statements:
| Statement I: | Kirchhoff’s current law is a consequence of the conservation of energy as applied to electric circuits. |
| Statement II: | Kirchhoff’s voltage law is a consequence of the conservation of charge. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: Kirchoff's Voltage Law |
68%
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The potential difference \(V_{AB}\) (in volts) is plotted as a function of the resistance \(R.\) The graph is given by
1.  |
2.  |
3.  |
4.  |
Subtopic: Derivation of Ohm's Law |
55%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | The electric bulbs glow immediately when switch is on. |
| Reason (R): | The drift velocity of electrons in a metallic wire is very high. |
In the light of the above statements choose the correct answer from the options given below:
| 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. | Both (A) and (R) are false. |
Subtopic: Current & Current Density |
From NCERT
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Four identical bulbs \(A\), \(B\), \(C\) and \(D\) are connected in a circuit as shown in the figure. Now whenever any bulb fails, then it cannot conduct current through it. Then which of the following statements is/are true?
| i. | brightness of bulb \(C\) is highest. |
| ii. | if \(A\) fails, \(B\) will not glow. |
| iii. | if \(C\) fails, brightness of bulb \(D\) increases. |
| 1. | (i) only |
| 2. | (ii) only |
| 3. | (i) and (ii) only |
| 4. | (ii) and (iii) only |
Subtopic: Heating Effects of Current |
59%
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | When an external resistor of resistance R (connected across a cell of internal resistance r) is varied power consumed by resistance R is maximum when R=r. |
| Reason (R): | Power consumed by a resistor of constant resistance R is maximum when the current through it is maximum. |
In the light of the above statements choose the correct answer from the options given below:
| 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. | Both (A) and (R) are false. |
Subtopic: Heating Effects of Current |
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The current-voltage graph for a given metallic conductor at two different temperatures \(T_{1}\) and \(T_{2}\) is as shown in the figure. Then:
1. \(T_{1}=T_{2}\)
2. \(T_{2}>T_{1}\)
3. \(T_{1}>T_{2}\)
4. nothing can be said
1. \(T_{1}=T_{2}\)
2. \(T_{2}>T_{1}\)
3. \(T_{1}>T_{2}\)
4. nothing can be said
Subtopic: Derivation of Ohm's Law |
75%
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | Resistance of a conducting metallic wire depends on the voltage applied across it and current passing through it. |
| Reason (R): | Ohm's law is also valid for semiconductors. |
In the light of the above statements choose the correct answer from the options given below:
| 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. | Both (A) and (R) are false. |
Subtopic: Derivation of Ohm's Law |
55%
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The electric current through a wire varies with time as shown.
The total charge flown across any cross-section of the wire in the time interval (\(0-T\)) is:
The total charge flown across any cross-section of the wire in the time interval (\(0-T\)) is:
| 1. | \( {i}_{0}T\) | 2. | \( \frac{{i}_{0}T}{2}\) |
| 3. | \( \frac{{i}_{0}T}{3}\) | 4. | \( \frac{{i}_{0}T}{\sqrt{2}}\) |
Subtopic: Current & Current Density |
73%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
Several resistances R1, R2,.........Rn are connected in parallel. The equivalent resistance of the combination is R.
In the light of the above statements choose the correct answer from the options given below:
Several resistances R1, R2,.........Rn are connected in parallel. The equivalent resistance of the combination is R.
| Assertion (A): | The fractional error in R is most affected by that of the smallest resistance in the combination, other things being equal. |
| Reason (R): | In parallel, the conductances add. The contribution to the overall error in the conductance is largest for the largest conductance or the smallest 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: Combination of Resistors |
58%
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