1. | number density of free current carries increases |
2. | relaxation time increases |
3. | both number density of carries and relaxation time increase |
4. | number density of current carriers increases, relaxation time decreases but the effect of decrease in relaxation time is much less than the increase in number density |
1. | \(1\) and \(3\) both correspond to forward bias of junction. |
2. | \(3\) corresponds to forward bias of junction and \(1\) corresponds to reverse bias of junction. |
3. | \(1\) corresponds to forward bias and \(3\) corresponds to reverse bias of junction. |
4. | \(3\) and \(1\) both correspond to reverse bias of junction. |
In the figure given below, assuming the diodes to be ideal,
1. | D1 is forward biased and D2 is revers-biased and hence current flows from A to B. |
2. | D2 is forward biased and D1 is reverse-biased and hence no current flows from B to A and vice-versa. |
3. | D1 and D2 are both forward-biased and hence current flows from A to B. |
4. | D1 and D2 are both reverse-biased and hence no current flows from A to B and vice-versa. |
A 220 V AC supply is connected between points A and B (figure). What will be the potential difference V across the capacitor?
1.
2.
3.
4.
Hole is:
1. | an anti-particle of electron. |
2. | a vacancy created when an electron leaves a covalent bond. |
3. | absence of free electrons. |
4. | an artificially created particle. |
The output of the given circuit in figure given below,
1. | would be zero at all times. |
2. | would be like a half wave rectifier with positive cycles in output. |
3. | would be like a half wave rectifier with negative cycles in output. |
4. | would be like that of a full wave rectifier. |
In the circuit shown in the figure given below, if the diode forward voltage drop is \(0.3~\text V,\) the voltage difference between \(A\) and \(B\) is:
1. \(1.3~\text V\)
2. \(2.3~\text V\)
3. \(0\)
4. \(0.5~\text V\)
When an electric field is applied across a semiconductor
(a) | electrons move from lower energy level to higher energy level in the conduction band |
(b) | electrons move from higher energy level to lower energy level in the conduction band |
(c) | holes in the valence band move from higher energy level to lower energy level |
(d) | holes in the valence band move from lower energy level to higher energy level |
Choose the correct option:
1. (a), (c)
2. (a), (d)
3. (b), (d)
4. (c), (d)
In the depletion region of a diode:
(a) | there are no mobile charges |
(b) | equal number of holes and electrons exist, making the region neutral |
(c) | recombination of holes and electrons has taken place |
(d) | immobile charged ions exist |
1. (a), (b)
2. (a), (b), (d)
3. (c), (d)
4. All options are correct