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Q. No.A uniform metallic wire having resistance \(4~\Omega\) is bent to form a square loop \((ABCD)\) (see figure). A resistance of \(2~\Omega\) is connected between points \(B\) and \(D\) and a battery of \(2~\text{V}\) is connected across points \(A\) and \(C\) as shown in the figure. Now the value of the current \((I)\) is:
1. \(2~\text{A}\)
2. \(4~\text{A}\)
3. \(8~\text{A}\)
4. \(4.5~\text{A}\)
1. \(2~\text{A}\)
2. \(4~\text{A}\)
3. \(8~\text{A}\)
4. \(4.5~\text{A}\)
Subtopic: Wheatstone Bridge |
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In a metre bridge experiment (see figure), the positions of the cell, \(E,\) and galvanometer, \(G,\) are interchanged. We shall observe in the galvanometer:
| 1. | Only the right-sided deflection. |
| 2. | Only the left-sided deflection. |
| 3. | There will be no deflection irrespective of the position of the jockey. |
| 4. | Both right-sided and left-sided deflection and, at balance point, no deflection. |
Subtopic: Meter Bridge |
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A resistor is connected to a battery of \(12\) V EMF and internal resistance \(2~\Omega.\) If the current in the circuit is \(0.6\) A, the terminal voltage of the battery is:
1. \(10~\text{V}\)
2. \(10.8~\text{V}\)
3. \(12~\text{V}\)
4. \(1.2~\text{V}\)
1. \(10~\text{V}\)
2. \(10.8~\text{V}\)
3. \(12~\text{V}\)
4. \(1.2~\text{V}\)
Subtopic: EMF & Terminal Voltage |
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A room heater is rated \(400\) W, \(220\) V. If the supply voltage drops to \(200\) V, what will be the power consumed (approximately)?
1. \(121~\text{W}\)
2. \(331~\text{W}\)
3. \(200~\text{W}\)
4. \(400~\text{W}\)
1. \(121~\text{W}\)
2. \(331~\text{W}\)
3. \(200~\text{W}\)
4. \(400~\text{W}\)
Subtopic: Heating Effects of Current |
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The current passing through the battery in the given circuit, is:
1. \(2.5~\text{A}\)
2. \(1.5~\text{A}\)
3. \(2.0~\text{A}\)
4. \(0.5~\text{A}\)
1. \(2.5~\text{A}\)
2. \(1.5~\text{A}\)
3. \(2.0~\text{A}\)
4. \(0.5~\text{A}\)
Subtopic: Wheatstone Bridge |
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NEET - 2025
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A wire of resistance \(R\) is cut into \(8\) equal pieces. From these pieces two equivalent resistance are made by adding four of these together in parallel. Then these two sets are added in series. The net effective resistance of the combination is:
| 1. | \(\dfrac{R}{16}\) | 2. | \(\dfrac{R}{8}\) |
| 3. | \(\dfrac{R}{64}\) | 4. | \(\dfrac{R}{32}\) |
Subtopic: Combination of Resistors |
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A constant voltage of \(50~\text{V}\) is maintained between the points \(A\) and \(B\) of the circuit shown in the figure. The current through the branch \(C D\) of the circuit is:
| 1. | \(2.5~\text{A}\) | 2. | \(3.0~\text{A}\) |
| 3. | \(1.5~\text{A}\) | 4. | \(2.0~\text{A}\) |
Subtopic: Kirchoff's Voltage Law |
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A battery with an EMF of \(10~\text V\) and an internal resistance of \(1~\Omega\) is connected to an external resistance of \(4~\Omega,\) as shown in the figure. The terminal voltage of the battery in this configuration is:
1. \(6~\text V\)
2. \(8~\text V\)
3. \(10~\text V\)
4. \(4~\text V\)
1. \(6~\text V\)
2. \(8~\text V\)
3. \(10~\text V\)
4. \(4~\text V\)
Subtopic: EMF & Terminal Voltage |
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A wire of length \('l'\) and resistance \(100 ~\Omega\) is divided into \(10\) equal parts. The first \(5\) parts are connected in series while the next \(5\) parts are connected in parallel. The two combinations are again connected in series. The resistance of this final combination is:
| 1. | \(52~ \Omega\) | 2. | \(55~ \Omega\) |
| 3. | \(60 ~\Omega\) | 4. | \(26~ \Omega\) |
Subtopic: Combination of Resistors |
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Two heaters \(\mathrm{A}\) and \(\mathrm{B}\) have power rating of \(1~\text{kW}\) and \(2~\text{kW}\), respectively. Those two are first connected in series and then in parallel to a fixed power source. The ratio of power outputs for these two cases is:
| 1. | \(2:9\) | 2. | \(1:2\) |
| 3. | \(2:3\) | 4. | \(1:1\) |
Subtopic: Heating Effects of Current |
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