Q. No.The current passing through a certain device doubles when the temperature rises by \(10^{\circ}\text{C}\), in the temperature range from \(0^{\circ}\text{C}\) to \(500^{\circ}\text{C}\). This effect is used to measure the temperature of a sample. The current is measured to be \(5~\text{mA}\) at \(15^{\circ}\text{C}\) and then the next measurement shows a current of \(50~\text{mA}\). The temperature of the new measurement is nearly: (take \(\text{log}_{10}2 \simeq 0.3\), if required)
1. \(150^{\circ}\text{C}\)
2. \(50^{\circ}\text{C}\)
3. \(450^{\circ}\text{C}\)
4. \(25^{\circ}\text{C}\)
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| 1. | \(1.5~\text{V}\) | 2. | \(-1.5~\text{V}\) |
| 3. | \(1.2~\text{V}\) | 4. | \(-1.2~\text{V}\) |
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| 1. | equals \(400~\Omega.\) |
| 2. | equals \(200~\Omega.\) |
| 3. | can have any value less than \(400~\Omega.\) |
| 4. | cannot be determined from the given information. |
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| 1. | \(V=2\) volts, positive at \(A.\) |
| 2. | \(V=2\) volts, negative at \(A.\) |
| 3. | \(V=6\) volts, positive at \(A.\) |
| 4. | \(V=6\) volts, negative at \(A.\) |
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| 1. | \(4~\Omega\) | 2. | \(2~\Omega\) |
| 3. | \(\dfrac43~\Omega\) | 4. | \(\dfrac{10}3~\Omega\) |
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| 1. |  |
2. |  |
| 3. |  |
4. |  |
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| 1. | \(1~\text A\) | 2. | \(0.5~\text A\) |
| 3. | \(2.5~\text A\) | 4. | \(3~\text A\) |
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1. \(2~\Omega\)
2. \(4~\Omega\)
3. \(6~\Omega\)
4. \(1.6~\Omega\)
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1. \(1\)
2. \(\dfrac12\)
3. \(\dfrac21\)
4. \(\sqrt2\)
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1. \(2 ~\Omega\)
2. \(3.2 ~\Omega\)
3. \(4 ~\Omega\)
4. \(6.4 ~\Omega\)
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