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Q. No.The conductivity of a semiconductor increases with an increase in temperature,
because:
because:
| 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 |
Subtopic: Â Energy Band theory |
 77%
Level 2: 60%+
Hints
In figure given below \(V_0\) is the potential barrier across a \(\mathrm{p\text-n}\) junction, when no battery is connected across the junction.
| 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. |
Subtopic: Â PN junction |
 63%
Level 2: 60%+
Hints
In the figure given below, assuming the diodes to be ideal,
| 1. | \(D_1\) is forward biased and \(D_2\) is revers-biased and hence current flows from \(A\) to \(B\). |
| 2. | \(D_2\) is forward biased and \(D_1\) is reverse-biased and hence no current flows from \(B\) to \(A\) and vice-versa. |
| 3. | \(D_1\) and \(D_2\) are both forward-biased and hence current flows from \(A\) to \(B\). |
| 4. | \(D_1\) and \(D_2\) are both reverse-biased and hence no current flows from \(A\) to \(B\) and vice-versa. |
Subtopic: Â PN junction |
 84%
Level 1: 80%+
Hints
A \(220~\text{V}\) AC supply is connected between points \(A\) and \(B\) (figure). What will be the potential difference \(V\) across the capacitor?
| 1. | \(220~\text{V}\) | 2. | \(110~\text{V}\) |
| 3. | \(0~\text{V}\) | 4. | \(220\sqrt{2}~\text{V}\) |
Subtopic: Â PN junction |
Level 3: 35%-60%
Hints
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. |
Subtopic: Â Types of Semiconductors |
 89%
Level 1: 80%+
Hints
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. |
Subtopic: Â PN junction |
Level 3: 35%-60%
Hints
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. | \(0.5~\text V\) |
Subtopic: Â PN junction |
 67%
Level 2: 60%+
Hints
A truth table for the given circuit is:
| 1. | \(A\) | \(B\) | \(E\) | 2. | \(A\) | \(B\) | \(E\) |
| \(0\) | \(0\) | \(1\) | \(0\) | \(0\) | \(1\) | ||
| \(0\) | \(1\) | \(1\) | \(0\) | \(1\) | \(0\) | ||
| \(1\) | \(0\) | \(1\) | \(1\) | \(0\) | \(0\) | ||
| \(1\) | \(1\) | \(0\) | \(1\) | \(1\) | \(0\) | ||
| 3. | \(A\) | \(B\) | \(E\) | 4. | \(A\) | \(B\) | \(E\) |
| \(0\) | \(0\) | \(0\) | \(0\) | \(0\) | \(0\) | ||
| \(0\) | \(1\) | \(1\) | \(0\) | \(1\) | \(1\) | ||
| \(1\) | \(0\) | \(0\) | \(1\) | \(0\) | \(1\) | ||
| \(1\) | \(1\) | \(1\) | \(1\) | \(1\) | \(0\) | ||
Subtopic: Â Logic gates |
 74%
Level 2: 60%+
Hints
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)
Subtopic: Â PN junction |
 58%
Level 3: 35%-60%
Hints
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
Subtopic: Â PN junction |
 68%
Level 2: 60%+
Hints
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