Q. No.If the potential difference across ends of a metallic wire is doubled, the drift velocity of charge carriers will become:
1. double
2. half
3. four times
4. one-fourth
1. double
2. half
3. four times
4. one-fourth
The resistance between terminals \(A\) and \(B\) is:
| 1. | \(5~\Omega\) | 2. | \(15~\Omega\) |
| 3. | \(10~\Omega\) | 4. | \(20~\Omega\) |
What is the ratio of currents flowing in the resistors \(x\) and \(y\) of resistance \(10~\Omega\) each?
1. \(1\)
2. \(0.5\)
3. \(1.5\)
4. \(2.0\)
| 1. | \(7R\) | 2. | \(5R\) |
| 3. | \(4R\) | 4. | \(3R\) |
What is the value of current \(I\) in the network shown below?
| 1. | \(2\) A | 2. | \(3\) A |
| 3. | \(4\) A | 4. | \(7\) A |
A current passes through a wire of variable cross-section in steady-state as shown. Then incorrect statement is:
| 1. | Current density increases in the direction of the current. |
| 2. | Potential increases in the direction of the current. |
| 3. | Electric field increases in the direction of the current. |
| 4. | Drift speed increases in the direction of the current. |
Two cells of emf \(E\) and internal resistance \(r_1\) and \(r_2\) are connected in series through an external resistance \(R\). The value of \(R\) for which the potential difference across one of the cells becomes zero will be:
| 1. | \(\dfrac{r_{1} r_{2}}{r_{1} + r_{2}}\) | 2. | \(r_{1} + r_{2}\) |
| 3. | \(|r_{1} - r_{2}|\) | 4. | \(\dfrac{r_{1}}{r_{2}}\) |
In the given circuit diagram, \(3\) identical bulbs are connected. If bulb \(B_3\) get fused suddenly, how will the brightness of bulbs \(B_1\) and \(B_2\) change?
| 1. | Brightness of bulb \(B_1\) will increase whereas brightness of bulb \(B_2\) will decrease |
| 2. | Brightness of bulb \(B_2\) will increase whereas brightness of bulb \(B_1\) will decrease |
| 3. | Brightness of both bulbs \(B_1\) and \(B_2\) will increase |
| 4. | Brightness of bulb \(B_1\) will increase whereas brightness of bulb \(B_2\) will remain the same |
What is the reading of the voltmeter of resistance \(1200~\Omega\) connected in the following circuit diagram?
| 1. | \(2.5\) V | 2. | \(5.0\) V |
| 3. | \(7.5\) V | 4. | \(40\) V |
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