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Q. No.Kirchhoff's second law is based on the principle of conservation of:
1. charge
2. energy
3. momentum
4. the sum of mass and energy
Subtopic: Kirchoff's Voltage Law |
88%
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The resistance between points \(A\) and \(B\) in the circuit shown in the following figure is:
| 1. | \(10~\Omega\) | 2. | \(20~\Omega\) |
| 3. | \(30~\Omega\) | 4. | \(40~\Omega\) |
Subtopic: Combination of Resistors |
78%
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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 statement(s) is/are true?
Choose the correct option from the options given below:
| (i) | The brightness of bulb \(C\) is the highest. |
| (ii) | If \(A\) fails, \(B\) will not glow. |
| (iii) | If \(C\) fails, the brightness of bulb \(D\) increases. |
Choose the correct option from the options given below:
| 1. | (i) only |
| 2. | (ii) only |
| 3. | (i) and (ii) only |
| 4. | (ii) and (iii) only |
Subtopic: Heating Effects of Current |
63%
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Consider a thin rectangular sheet of side \(L,\) width \(b\) and thickness \(t,\) made of a material of resistivity \(\rho\). The resistance between two opposite faces, shown by the shaded areas in the figure is:
| 1. | directly proportional to \(b\) |
| 2. | inversely proportional to \(t\) |
| 3. | inversely proportional to \(L\) |
| 4. | both (1) and (2) |
Subtopic: Derivation of Ohm's Law |
66%
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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. Insufficient information to conclude.
1. \(T_{1}=T_{2}\)
2. \(T_{2}>T_{1}\)
3. \(T_{1}>T_{2}\)
4. Insufficient information to conclude.
Subtopic: Derivation of Ohm's Law |
77%
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Two resistors of resistance, \(100~\Omega\) and \(200~\Omega\) are connected in parallel in an electrical circuit. The ratio of the thermal energy developed in \(100~\Omega\) resistor to that in \(200~\Omega\) resistor in a given time is:
1. \(4:1\)
2. \(1:2\)
3. \(2:1\)
4. \(1:4\)
1. \(4:1\)
2. \(1:2\)
3. \(2:1\)
4. \(1:4\)
Subtopic: Heating Effects of Current |
71%
From NCERT
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A copper wire of length \(10\) m and radius \(\left({10^{-2}/\sqrt{\pi}}\right)\) m has an electrical resistance of \(10~\Omega.\) The current density in the wire for an electric field strength of \(10\) (V/m) is:
1. \(10^{5}\) A/m2
2. \(10^{4}\) A/m2
3. \(10^{6}\) A/m2
4. \(10^{-5}\) A/m2
1. \(10^{5}\) A/m2
2. \(10^{4}\) A/m2
3. \(10^{6}\) A/m2
4. \(10^{-5}\) A/m2
Subtopic: Current & Current Density |
68%
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Given below are two statements:
| Assertion (A): | Terminal voltage of a cell is greater than emf of a cell during charging of the cell. |
| Reason (R): | The emf of a cell is always greater than its terminal voltage. |
| 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: EMF & Terminal Voltage |
87%
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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 |
80%
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Given below are two statements:
| Assertion (A): | Though a large number of free electrons are present in the metal. Yet there is no current in the absence of an electric field. |
| Reason (R): | In the absence of an electric field, electrons move randomly in all directions. |
| 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 |
90%
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