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Q. No.Two electric bulbs, one of \(200~\text{V}-40~\text{W}\) and the other of \(200~\text{V}-100~\text{W}\) are connected in a domestic circuit. Then:
1.
they have equal currents through them.
2.
the resistances of both the bulbs are the same.
3.
the resistance of the bulb of \(40~\text{watts}\) is more.
4.
the resistance of the bulb of \(100~\text{watts}\) is more.
Subtopic: Heating Effects of Current |
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A house is served by \(220~\text{V}\) supply line. In a circuit protected by a fuse marked by \(9~\text{A},\) the maximum number of \(60~\text{W}\) lamps in parallel that can be turned on, is:
1. \(44\)
2. \(20\)
3. \(22\)
4. \(33\)
1. \(44\)
2. \(20\)
3. \(22\)
4. \(33\)
Subtopic: Heating Effects of Current |
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In the adjoining figure, the galvanometer reads zero. The resistance \(x\) is:
| 1. | \(7~\Omega\) | 2. | \(14~\Omega\) |
| 3. | \(21~\Omega\) | 4. | \(28~\Omega\) |
Subtopic: Wheatstone Bridge |
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A nichrome wire \(50~\text{cm}\) long and \(1~\text{mm}^{2}\) cross-section carries a current of \(4~\text{A}\) when connected to a \(2~\text{V}\) battery. The resistivity of nichrome wire is:
| 1. | \(1\times 10^{-6} ~\Omega-\text{m}\) |
| 2. | \(4\times 10^{-7}~\Omega-\text{m}\) |
| 3. | \(3\times 10^{-7}~\Omega-\text{m}\) |
| 4. | \(2\times 10^{-7}~\Omega-\text{m}\) |
Subtopic: Derivation of Ohm's Law |
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The given, figure represents a meter bridge setup, with the galvanometer showing null deflection at the balance point.
What is the value of the unknown resistor \(R?\)
1. \(13.75~\Omega\)
2. \(220~\Omega\)
3. \(110~\Omega\)
4. \(55~\Omega\)
Subtopic: Meter Bridge |
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Given below are two statements:
| Assertion (A): | As the drift velocity decreases, the current flowing through the conductor decreases. |
| Reason (R): | The current flowing through a conductor is directly proportional to the drift velocity. |
| 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 |
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The figure shows a circuit with two cells connected in opposition. One cell has an EMF of \(6~\text{V}\) and an internal resistance of \({2}~\Omega,\) while the other cell has an EMF of \(4~\text{V}\) and an internal resistance of \({8}~\Omega.\) The potential difference across the terminals \(X\) and \(Y\) is:
| 1. | \(5.4\) V | 2. | \(5.6\) V |
| 3. | \(5.8\) V | 4. | \(6.0\) V |
Subtopic: Grouping of Cells |
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In the electrical network shown below, resistors are connected between points, \(P\) and \(Q.\) Each corner branch contains a resistance of \(2R,\) while the central horizontal branch contains two resistors of resistance \(r\) each. The vertical branch resistors also have a resistance of \(2R\) each.
What is the effective resistance between points \(P\) and \(Q\text{?}\)
| 1. | \(2 R r /(R+r)\) | 2. | \(8 R(R+r) /(3 R+r)\) |
| 3. | \((2r+4R)\) | 4. | \((5R/2+2r)\) |
Subtopic: Combination of Resistors |
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The current in a simple series circuit is \(5.0\) A. When an additional resistance of \(2.0\) \(\Omega\) is inserted, the current decreases to \(4.0\) A. The original resistance of the circuit was:
1. \(1.25\) \(\Omega\)
2. \(8\) \(\Omega\)
3. \(10\) \(\Omega\)
4. \(20\) \(\Omega\)
Subtopic: Combination of Resistors |
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A current of \(15\) mA flows in the circuit as shown in the figure. The value of the potential difference between the points \(A\) and \(B\) will be:
1. \(50\) V
2. \(75\) V
3. \(150\) V
4. \(275\) V
1. \(50\) V
2. \(75\) V
3. \(150\) V
4. \(275\) V
Subtopic: Combination of Resistors |
82%
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