The net charges on -type semiconductor and -type semiconductor are, respectively:
1. Positive, negative
2. Negative, positive
3. Positive, positive
4. Zero, zero
In which of the following condition, diffusion current in junction is more than drift current?
1. | Forward biasing | 2. | Reverse biasing |
3. | No biasing | 4. | All of these |
What is the reading of the ideal ammeters A1 and A2 connected in the given circuit diagram, if junction diodes are ideal?
1. 2 A and zero
2. 3 A and 2 A
3. 2 A and 3 A
4. Zero and 2 A
If in a reverse-biased junction, an increase in carrier concentration takes place due to the creation of new hole-electron pairs by the light of wavelength less than or equal to 620 nm, then the bandgap is:
1. 1 eV
2. 2 eV
3. 20 eV
4. 0.2 eV
Which of the following graphs may correctly represent the variation of current (l) with potential difference (V) across a zener diode?
1. | 2. | ||
3. | 4. |
Which of the following statements is incorrect about LED?
1. | It requires a low operational voltage. |
2. | It has a fast on-off switching capability. |
3. | The bandwidth of the emitted light is 100 A to 10000 A. |
4. | It does not require warm-up time. |
A combination of logic gates is shown in the circuit. If \(A\) is at \(0\) V and \(B\) is at \(5\) V, then the potential of \(R\) is:
1. \(0\) V
2. \(5\) V
3. \(10\) V
4. Any of these
How many minimum number of NOR gates are required to obtain an AND gate?
1. One
2. Two
3. Three
4. Five
The circuit shown below is an electrical analogue for which of the following logic gates?
1. AND gate
2. OR gate
3. NOT gate
4. NOR gate
What is the equivalent resistance across the terminals of the battery if the diodes are ideal?
1. | \(10~ \Omega\) | 2. | \(20~ \Omega\) |
3. | \(15~ \Omega\) | 4. | \({10\over3} ~ \Omega\) |