The following table is for which logic gate?
Input | Output | |
A | B | C |
0 | 0 | 1 |
0 | 1 | 1 |
1 | 0 | 1 |
1 | 1 | 0 |
1. AND
2. OR
3. NAND
4. NOT
Zener diode is used for:
1. rectification.
2. stabilisation.
3. amplification.
4. producing oscillations in an oscillator.
Given Truth table is correct for:
1. NAND
2. AND
3. NOR
4. OR
Identify the incorrect statement from the following:
1. | The resistivity of a semiconductor increases with an increase in temperature. |
2. | Substances with an energy gap of the order of 10 eV are insulators. |
3. | In conductors, the valence and conduction bands may overlap. |
4. | The conductivity of a semiconductor increases with an increase in temperature. |
Application of a forward bias to a p-n junction:
1. | widens the depletion zone. |
2. | increases the number of donors on the n side. |
3. | increases the potential difference across the depletion zone. |
4. | increases the electric field in the depletion zone. |
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 |
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. |
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. |
For the given circuit of the P-N junction diode, which of the following statements is correct?
1. | In F.B. the voltage across R is V. |
2. | In R.B. the voltage across R is V. |
3. | In F.B. the voltage across R is 2V. |
4. | In R.B. the voltage across R is 2V. |