- 1(current)
Q. No.A current passes through a resistor. Let K1 and K2 represent the average kinetic energy of the conduction electrons and the metal ions respectively.
1. K1 < K2
2. K1 = K2
3. K1 > K2
4. Any of these three may occur
The electrons are emitted by a hot filament and are accelerated by an electric field as shown in the figure. The two stops at the left ensure that the electron beam has a uniform cross-section.
| (a) | The speed of the electron is more at \(B\) than at \(A.\) |
| (b) | The electric current is from left to right. |
| (c) | The magnitude of the current is larger at \(B\) than at \(A.\) |
| (d) | The current density is more at \(B\) than at \(A.\) |
| 1. | (a) only |
| 2. | (b) and (c) only |
| 3. | (c) and (d) only |
| 4. | (a) and (d) only |
When no current is passed through a conductor,
| (a) | the free electrons do not move. |
| (b) | the average speed of a free electron over a large period of time is zero. |
| (c) | the average velocity of a free electron over a large period of time is zero. |
| (d) | the average of the velocities of all the free electrons at an instant is zero. |
Choose the correct option:
| 1. | (a) only | 2. | (b), (c) |
| 3. | (c), (d) | 4. | (a), (d) |
| (a) | the charge crossing in a given time interval |
| (b) | drift speed |
| (c) | current density |
| (d) | free-electron density |
Choose the correct option from the given ones:
| 1. | (a) \(\text { only }\) | 2. | (b) and (c) \(\text { only}\) |
| 3. | (c) and (d) \(\text { only }\) | 4. | (a) and (d) \(\text { only }\) |
Electric conduction takes place in a discharge tube due to the movement of
(a) positive ions
(b) negative ions
(c) electrons
(d) protons
Choose the correct option:
1. (a), (b), (c)
2. (b), (c)
3. (b), (c), (d)
4. (a), (b), (d)
- 1(current)
Q. No.
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