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Q. No.Each branch in the following circuit has a resistance \(R\).
The equivalent resistance of the circuit between points \(A\) and \(B\) is:
1.
\(R\)
2.
\(2R\)
3.
\(4R\)
4.
\(8R\)
Subtopic: Â Combination of Resistors |
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In the circuit, wire \(1\) is of negligible resistance. Then:
| 1. | current will flow through wire \(1\) if \(E _{1}\neq E _{2}\) |
| 2. | current will flow through wire \(1\) if \(\dfrac{E _{1}}{R_{1}}\neq \dfrac{E _{2}}{R_{2}}\) |
| 3. | current will flow through wire \(1\) if \((E_{1} +E _{2})\left ( R_{1}+R_{2} \right )\neq (E_{1} -E _{2})\left ( R_{1}-R_{2} \right )\) |
| 4. | no current will flow through wire \(1\) |
Subtopic: Â Kirchoff's Current Law |
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Three resistors are connected to a \(20\) V battery with a constant voltage supply. One of the resistors is a variable resistor. The resistance of the variable resistor is gradually increased from \(0~\Omega\) to \(5\) \(\Omega.\)
Which graph correctly represents how the current drawn from the battery varies with the resistance \((R)\) of the variable resistor?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Â Derivation of Ohm's Law |
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Two non-ideal batteries are connected in parallel: Battery of EMF \(E_1,\) resistance \(r_1\) and of EMF \(E_2\), resistance \(r_2.\) The resulting equivalent battery has EMF '\(E,\)' resistance \(r.\) If \(r_1<r_2,\)
1. \(|E-E_1|<|E-E_2|\)
2. \(|E+E_1|<|E+E_2|\)
3. \(|E-E_1|>|E-E_2|\)
4. \(|E+E_1|>|E+E_2|\)
1. \(|E-E_1|<|E-E_2|\)
2. \(|E+E_1|<|E+E_2|\)
3. \(|E-E_1|>|E-E_2|\)
4. \(|E+E_1|>|E+E_2|\)
Subtopic: Â Grouping of Cells |
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All the resistances shown in the network are equal to \(1~\Omega.\) Find the resistance of the network measured between \(A\) and \(D.\)
1. \(1~\Omega\)
2. \(2~\Omega\)
3. \(\dfrac{1}{2}~\Omega\)
4. \(\dfrac{1}{4}~\Omega\)
1. \(1~\Omega\)
2. \(2~\Omega\)
3. \(\dfrac{1}{2}~\Omega\)
4. \(\dfrac{1}{4}~\Omega\)
Subtopic: Â Combination of Resistors |
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Find the current through the rightmost \(2~\Omega\) resistor.
1. \(1~\text{A}\)
2. \(2~\text{A}\)
3. \(0.5 ~\text{A}\)
4. \(0.25~\text{A}\)
1. \(1~\text{A}\)
2. \(2~\text{A}\)
3. \(0.5 ~\text{A}\)
4. \(0.25~\text{A}\)
Subtopic: Â Kirchoff's Voltage Law |
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The potential difference between the ends of a \(12~\text{V}\) battery when it is being charged by a \(2~\text{A}\) charger is found to be \(13.2~\text{V}\). If this battery is connected in a circuit with a \(6~\Omega\) resistance, the current will be nearly:
| 1. | \(2~\text{A}\) | 2. | \(1~\text{A}\) |
| 3. | \(1.8~\text{A}\) | 4. | \(2.2~\text{A}\) |
Subtopic: Â Kirchoff's Voltage Law |
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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: Â Derivation of Ohm's Law |
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Two hundred cells of the same emf \(E\) and same internal resistance \(r\) are connected in series in the same order without external resistance. The potential drop across \(50\) cells is found to be:
1. \(50E\)
2. \(150E\)
3. \(200E\)
4. zero
1. \(50E\)
2. \(150E\)
3. \(200E\)
4. zero
Subtopic: Â Grouping of Cells |
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\(18\) cells each having the same EMF are connected in series with some cells being wrongly connected. This arrangement of battery is connected in series with an ammeter and two identical cells which are in series. Current of \(3~\text{A}\) is drawn when cells and battery support each other and current of \(2~\text{A}\) is drawn when cells and battery oppose each other. The number of wrongly connected cells is:
| 1. | \(1\) | 2. | \(2\) |
| 3. | \(3\) | 4. | \(4\) |
Subtopic: Â Grouping of Cells |
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