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Q. No.When the potential difference applied in a conductor is doubled and also the length of the conductor is halved, the drift speed of electrons in the conductor will:
1.
not change
2.
be halved
3.
be four times
4.
be doubled
Subtopic: Current & Current Density |
68%
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In the figure shown, each resistor has resistance \(R.\)
Match Column-I and Column-II.
Match Column-I and Column-II.
| Column-I | Column-II | ||
| (A) | Equivalent resistance between \(a\) and \(b\) | (P) | \(\dfrac{R}{2}\) |
| (B) | Equivalent resistance between \(a\) and \(c\) | (Q) | \(\dfrac{5R}{8}\) |
| (C) | Equivalent resistance between \(b\) and \(d\) | (R) | \(R\) |
| 1. | (A )→ (P), (B) → (Q), (C) → (R) |
| 2. | (A) → (Q), (B) → (P), (C)→ (R) |
| 3. | (A ) → (R), (B) → (P), (C) → (Q) |
| 4. | (A ) → (R), (B) → (Q), (C) → (P) |
Subtopic: Wheatstone Bridge |
75%
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A wire made of a metal of uniform resistivity \(1.0\times 10^{-6}~\Omega{\text{-m}}\) is \(2.0~\text{m}\) long and has a diameter of \(2.0\times 10^{-3}~\text{m}.\). What is the electrical resistance of this length of the wire?
| 1. | \(\dfrac {2.0 ~\times~10^{-3}}{\pi} ~\Omega\) | 2. | \(5.0 ~\times~10^{-13}\pi~\Omega\) |
| 3. | \(\dfrac {1.0}{2\pi}~\Omega\) | 4. | \(\dfrac{2.0}{\pi}~\Omega\) |
Subtopic: Derivation of Ohm's Law |
82%
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In the given figure, the value of \(V_{0}\) will be:
1. \(2\) V
2. \(4\) V
3. \(6\) V
4. \(3\) V
1. \(2\) V
2. \(4\) V
3. \(6\) V
4. \(3\) V
Subtopic: Kirchoff's Voltage Law |
82%
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JEE
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A circuit consists of five identical conductors as shown in the figure. The two similar conductors are added as indicated by the dotted lines. The ratio of resistances before and after the addition will be:
1. \(\dfrac{7}{5}\)
2. \(\dfrac{3}{5}\)
3. \(\dfrac{5}{3}\)
4. \(\dfrac{6}{5}\)
1. \(\dfrac{7}{5}\)
2. \(\dfrac{3}{5}\)
3. \(\dfrac{5}{3}\)
4. \(\dfrac{6}{5}\)
Subtopic: Combination of Resistors |
84%
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Given below are two statements:
| Assertion (A): | Insulators do not allow flow of current through themselves. |
| Reason (R): | They have no free charge carriers. |
| 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 |
94%
From NCERT
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Given below are two statements:
| Assertion (A): | A \(60~\text{W}-220~\text{V}\) bulb glows more than a \(100~\text{W}-220~\text{V}\) bulb when they are connected in series across a potential difference. |
| Reason (R): | When they are connected in series, the resistance of the \(100\) W bulb will be more. |
| 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: Heating Effects of Current |
67%
From NCERT
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Given below are two statements:
| Assertion (A): | Though a large number of free electrons are present in the metal. Yet there is no current in the absence of an electric field. |
| Reason (R): | In the absence of an electric field, electrons move randomly in all directions. |
| 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 |
90%
From NCERT
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The plot of current \(I~\text{(A)}\) flowing through a metallic conductor versus the applied voltage \(V~\text{(volt)}\) across the ends of a conductor is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Derivation of Ohm's Law |
80%
From NCERT
NEET - 2022
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Given below are two statements:
| Assertion (A): | Terminal voltage of a cell is greater than emf of a cell during charging of the cell. |
| Reason (R): | The emf of a cell is always greater than its terminal voltage. |
| 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. | (A) is False but (R) is True. |
Subtopic: EMF & Terminal Voltage |
86%
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