Q. No.The LED:
1. is reverse-biased.
2. is forward-biased.
3. can be made of \(\mathrm{GaAs}\).
4. both (2) & (3) are correct.
1. is reverse-biased.
2. is forward-biased.
3. can be made of \(\mathrm{GaAs}\).
4. both (2) & (3) are correct.
| 1. | the drift of holes. |
| 2. | diffusion of charge carriers. |
| 3. | migration of impurity ions. |
| 4. | drift of electrons. |
1. \(36~\text{mW}\)
2. \(12~\text{mW}\)
3. \(144~\text{mW}\)
4. \(72~\text{mW}\)
A Zener diode is used to obtain a constant voltage. If applied voltage \(\text V\) changes, then:
(\(\text V\) is more than Zener voltage)
| 1. | \(i_{1}\) and \(i_{2}\) change. |
| 2. | \(i_{2}\) and \(\text V_{0}\) change and \(i_{3}\) remains constant. |
| 3. | \(i_{2}\) and \(\text V_{0}\) don't change while \(i_{3}\) changes. |
| 4. | \(i_{3}\) and \(\text V_{0}\) don't change while \(i_{2}\) changes. |
| 1. |  |
2. |  |
| 3. |  |
4. |  |
1. \(2\) A and zero
2. \(3\) A and \(2\) A
3. \(2\) A and \(3\) A
4. zero and \(2\) A
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. |
The given circuit has two ideal diodes connected as shown in the figure below. The current flowing through the resistance \(R_1\) will be:
| 1. | \(2.5\) A | 2. | \(10.0\) A |
| 3. | \(1.43\) A | 4. | \(3.13\) A |
In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is a/an:
| 1. | \(\mathrm{p}\text-\)type semiconductor |
| 2. | insulator |
| 3. | metal |
| 4. | \(\mathrm{n}\text-\)type semiconductor |
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