- 1(current)
Q. No.
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| 1. |  |
2. |  |
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4. |  |
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An LED is constructed from a \(\mathrm{p\text{-}n}\) junction diode using \(\mathrm{GaAsP}.\) The energy gap is \(1.9~\text{eV}.\) The wavelength of the light emitted will be equal to:
1. \(10.4 \times 10^{-26}~ \text{m}\)
2. \(654~ \text{nm}\)
3. \(654~ \text{m}\)
4. \(654\times 10^{-11}~\text{m}\)
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The zener breakdown will occur if:
| 1. | the impurity level is low. |
| 2. | the impurity level is high. |
| 3. | the impurity is less on the \(\mathrm{n\text-}\)side. |
| 4. | the impurity is less on the \(\mathrm{p\text-}\)side. |
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1. \(36~\text{mW}\)
2. \(12~\text{mW}\)
3. \(144~\text{mW}\)
4. \(72~\text{mW}\)
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The LED:
| 1. | is reverse-biased. |
| 2. | is forward-biased. |
| 3. | can be made of \(\mathrm{GaAs}.\) |
| 4. | both (2) and (3) are correct. |
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A Zener diode is used to obtain a constant voltage. If the applied voltage \(V\) changes, then:
(\( V\) is more than Zener voltage)
| 1. | \(i_{1}\) and \(i_{2}\) change. |
| 2. | \(i_{2}\) and \( V_{0}\) change and \(i_{3}\) remain constant. |
| 3. | \(i_{2}\) and \(V_{0}\) don't change while \(i_{3}\) changes. |
| 4. | \(i_{3}\) and \( V_{0}\) don't change while \(i_{2}\) changes. |
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The given graph represents the \(V\text-I\) characteristics of a semiconductor device. Which of the following statements is correct?
| 1. | It is a \(V\text-I\) characteristic of a solar cell where the point \(A\) represents open-circuit voltage and the point \(B\) represents short-circuit current. |
| 2. | It is for a solar cell and points \(A\) and \(B\) represents open-circuit voltage and current respectively. |
| 3. | It is for a photodiode and points \(A\) and \(B\) represents open-circuit voltage and current respectively. |
| 4. | It is for an LED and points \(A\) and \(B\) represents open-circuit voltage and short-circuit current respectively. |
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A Zener diode is shown in the following circuit diagram. When the source voltage fluctuates such that \(V>V_z\) then:
| 1. | all the current \(I_1, I_2~\text{and}~I_3\) change. |
| 2. | only \(I_1\) and \(I_2\) change and \(I_3\) remains constant. |
| 3. | only \(I_1\) and \(I_3\) change and \(I_2\) remains constant. |
| 4. | all the currents remain constant. |
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- 1(current)
Q. No.
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