Q. No.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
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 |
| 1. | the drift of holes. |
| 2. | diffusion of charge carriers. |
| 3. | migration of impurity ions. |
| 4. | drift of electrons. |
The LED:
1. is reverse-biased.
2. is forward-biased.
3. can be made of \(\mathrm{GaAs}\).
4. both (2) & (3) are correct.
In a half-wave rectification, what is the output frequency if the input frequency is \(50\) Hz?
1. \(50~\text{Hz}\)
2. \(100~\text{Hz}\)
3. \(25~\text{Hz}\)
4. \(60~\text{Hz}\)
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
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