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Q. No.When a current \(i\) flows through a conductor, the drift velocity of free electrons is \(v.\) If the current is increased to \(2i,\) and the cross-sectional area of the conductor is doubled, what will be the new drift velocity of the free electrons?
1.
\(\dfrac{v}{4}\)
2.
\(\dfrac{v}{2}\)
3.
\(v\)
4.
\(4v\)
Subtopic: Current & Current Density |
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In the given figure, the equivalent resistance between the points \(A\) and \(B\) is:
1. \(8~\Omega\)
2. \(6~\Omega\)
3. \(4~\Omega\)
4. \(2~\Omega\)
1. \(8~\Omega\)
2. \(6~\Omega\)
3. \(4~\Omega\)
4. \(2~\Omega\)
Subtopic: Combination of Resistors |
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What would be the value of current through \(2\) \(\Omega\) resistance for the given circuit in the figure?
1. zero
2. \(2\) A
3. \(5\) A
4. \(4\) A
1. zero
2. \(2\) A
3. \(5\) A
4. \(4\) A
Subtopic: Kirchoff's Current Law |
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Given below are two statements:
| Assertion (A): | In the Wheatstone Bridge shown in the figure, if the resistances in opposite arms are switched (i.e. \(Q, R \) are exchanged) then the bridge remains balanced if it was initially balanced. |
| Reason (R): | The balance condition \(\dfrac P Q\) = \(\dfrac R S\) is not affected if resistances in opposite arms are switched. |
| 1. | (A) is True but (R) is False. |
| 2. | (A) is False but (R) is True. |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
Subtopic: Wheatstone Bridge |
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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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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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