Q. No.
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.
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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. | \(\dfrac{r_{1}}{r_{2}}\) |
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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 |
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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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The dependence of resistivity \((\rho)\) on the temperature \((T)\) of a semiconductor is, roughly, represented by:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
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Current through the \(2~\Omega\) resistance in the electrical network shown is:
| 1. | zero | 2. | \(1~\text A\) |
| 3. | \(3~\text A\) | 4. | \(5~\text A\) |
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Two batteries, one of emf \(18~\text{V}\) and internal resistance \(2~\Omega\) and the other of emf \(12~\text V\) and internal resistance \(1~\Omega,\) are connected as shown. Reading of the voltmeter is:
(if a voltmeter is ideal)
1. \(14~\text V\)
2. \(15~\text V\)
3. \(18~\text V\)
4. \(30~\text V\)
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A current of \(2\) A is to be sent through a resistor of \(5 ~\Omega.\) Number of cells required in series, if each has emf \(2\) V and internal resistance \(0.5~\Omega,\) are:
1. \(40\)
2. \(30\)
3. \(20\)
4. \(10\)
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A \(50\) kW dc generator produces a potential difference of \(250\) V. If the resistance of the transmission line is \(1~\Omega\), what percentage of the original power is lost during transmission?
1. \(80\%\)
2. \(40\%\)
3. \(20\%\)
4. \(10\%\)
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