Q. No.The cause of potential barrier in a P-N junction diode is:
1.
Concentration of positive and negative ions near the junction.
2.
Concentration of positive charges near the junction.
3.
Depletion of negative charges near the junction.
4.
Increment in concentration of holes and electrons near the junction.
Of the diodes shown in the following diagrams, which one of the diodes is reverse biased?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
The truth table for the following network is:
| 1. |
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| 2. |
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| 3. |
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| 4. | None of the above |
Zener diode is used as:
1. Half-wave rectifier
2. Full-wave rectifier
3. A.C. voltage stabilizer
4. D.C. voltage stabilizer
The depletion layer has (for an unbiased \(p-n\) junction):
1. electrons
2. holes
3. static ions
4. neutral atoms
In semiconductors at room temperature:
| 1. | The valence band is completely filled and the conduction band is partially filled. |
| 2. | The valence band is completely filled. |
| 3. | The conduction band is completely empty. |
| 4. | The valence band is partially empty and the conduction band is partially filled. |
The peak voltage in the output of a half-wave diode rectifier fed with a sinusoidal signal without a filter is \(10\) V. The d. c. component of the output voltage is:
1. \(\frac{10}{\pi }\) V
2. \(10\) V
3. \(\frac{20}{\pi }\) V
4. \(\frac{10}{\sqrt{2}}\) V
In a p–n junction photocell, the value of the photo electromotive force produced by monochromatic light is proportional to:
| 1. | the intensity of the light falling on the cell. |
| 2. | the frequency of the light falling on the cell. |
| 3. | the voltage applied at the p–n junction. |
| 4. | the barrier voltage at the p–n junction. |
The output of the OR gate is \(1\):
| 1. | if either or both inputs are \(1.\) |
| 2. | only if both inputs are \(1.\) |
| 3. | if either input is zero |
| 4. | if both inputs are zero |
What is the correct statement regarding a p-n junction:
| 1. | high potential at the n side and low potential at the p side |
| 2. | high potential at the p side and low potential at the n side |
| 3. | p and n both are at the same potential |
| 4. | undetermined |
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