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Q. No.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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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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NEET - 2026
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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 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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Consider two circuits, \((\mathrm{A})\) and \((\mathrm{B}),\) each having two resistors. One of them has a positive temperature coefficient of resistance, \(+\alpha\), while the other one has a negative temperature coefficient of coefficient, \(-\alpha\), as shown in the figure. The current through these circuits are denoted by \(I_A\) and \(I_B\). At the initial temperature, the resistance of the two resistors is \(R_0.\) As the temperature is increased, the correct option that describes the variation of current in these circuits is:
1. both \(I_A\) and \(I_B\) remain constant
2. \(I_A\) remains constant while \(I_B\) increases
3. \(I_A\) decreases while \(I_B\) increases
4. \(I_A\) increases while \(I_B\) decreases
1. both \(I_A\) and \(I_B\) remain constant
2. \(I_A\) remains constant while \(I_B\) increases
3. \(I_A\) decreases while \(I_B\) increases
4. \(I_A\) increases while \(I_B\) decreases
Subtopic: Derivation of Ohm's Law |
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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 |
Level 3: 35%-60%
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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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 |
Level 3: 35%-60%
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There are two heaters \(A\) and \(B.\) The heater \(A\) takes time \(t_1\) to boil a given quantity of water, while \(B\) takes time \(t_2\) to boil the same quantity of water across the same supply voltage. If the two heaters are connected in series, the time taken by this combination to boil the same quantity of water will be:
| 1. | \(\large\dfrac{t_1t_2}{t_1+t_2}\) | 2. | \(t_1+t_2\) |
| 3. | \({\large\dfrac12}(t_1+t_2)\) | 4. | \(\large\dfrac{t_1t_2}{2(t_1+t_2)}\) |
Subtopic: Heating Effects of Current |
58%
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NEET - 2024
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The equivalent resistance \(R_{AB}\) between points \(A\) and \(B\) in the given network is:
| 1. | \(1R\) | 2. | \({\dfrac35}R\) |
| 3. | \({\dfrac78}R\) | 4. | \({\dfrac58}R\) |
Subtopic: Combination of Resistors |
70%
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