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Q. No.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
Choose the correct option:
1. (a), (b)
2. (a), (b), (d)
3. (c), (d)
4. All options are correct
Subtopic: PN junction |
68%
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What happens during the regulation action of a Zener diode?
| a. | the current and voltage across the Zener remain fixed. |
| b. | the current through the series Resistance \((R_s)\) changes. |
| c. | the Zener resistance is constant. |
| d. | the resistance offered by the Zener changes. |
Choose the correct option:
| 1. | (a, b) | 2. | (b, d) |
| 3. | (b, c) | 4. | (c, d) |
Subtopic: Applications of PN junction |
53%
From NCERT
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To reduce the ripples in rectifier circuit with capacitor filter:
| (a) | \(R_L\) should be increased |
| (b) | input frequency should be decreased |
| (c) | input frequency should be increased |
| (d) | capacitors with high capacitance should be used |
Choose the correct option:
| 1. | (a), (c) | 2. | (b), (d) |
| 3. | (a), (c), (d) | 4. | (b), (c), (d) |
Subtopic: Applications of PN junction |
61%
From NCERT
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The breakdown in a reverse-biased \(\mathrm{p\text-n}\) junction is more likely to occur due to:
| (a) | the large velocity of the minority charge carriers if the doping concentration is small. |
| (b) | the large velocity of the minority charge carriers if the doping concentration is large. |
| (c) | strong electric field in a depletion region if the doping concentration is small. |
| (d) | strong electric field in the depletion region if the doping concentration is large. |
Choose the correct option:
1. (a), (d)
2. (b), (d)
3. (c), (d)
4. (b), (c)
Subtopic: PN junction |
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Consider an n-p-n transistor with its base-emitter junction forward biased and collector-base junction reverse biased. Which of the following statements are true?
| a. | Electrons crossover from emitter to collector |
| b. | Holes move from base to collector |
| c. | Electrons move from emitter to base |
| d. | Electrons from the emitter move out of the base without going to the collector. |
1. (a, d)
2. (a, c)
3. (b, c)
4. (c, d)
68%
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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: PN junction |
58%
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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: Logic gates |
74%
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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: PN junction |
67%
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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: PN junction |
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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: Types of Semiconductors |
89%
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