Q. No.In the given figure, a diode D is connected to an external resistance R=100 Ω and an EMF of 3.5 V. If the barrier potential developed across the diode is 0.5 V, the current in the circuit will be:
1. 30 mA
2. 40 mA
3. 20 mA
4. 35 mA
If in a p-n junction, a square input signal of 10 V is applied as shown,
then the output across RL will be:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Which logic gate is represented by the following combination of logic gates?
2. NAND
3. AND
4. NOR
The given graph represents the V-I characteristic for a semiconductor device.
Which of the following statement is correct?
| 1. | It is a V-I characteristic for the solar cell where point A represents open-circuit voltage and point B short circuit current. |
| 2. | It is for a solar cell and points A and B represent open-circuit voltage and current, respectively. |
| 3. | It is for a photodiode and points A and B represent open-circuit voltage and current respectively. |
| 4. | It is for a LED and points A and B represent open circuit voltage and short circuit current, respectively. |
The barrier potential of a p-n junction depends on:
| (a) | type of semiconductor material |
| (b) | amount of doping |
| (c) | temperature |
Which one of the following is correct?
1. (a) and (b) only
2. (b) only
3. (b) and (c) only
4. (a), (b) and (c)
| 1. | Electrons are minority carriers and pentavalent atoms are dopants. |
| 2. | Holes are minority carriers and pentavalent atoms are dopants. |
| 3. | Holes are the majority carriers and trivalent atoms are dopants. |
| 4. | Electrons are the majority carriers and trivalent atoms are dopants. |
The output (X) of the logic circuit shown in the figure will be:
1. X=¯A⋅B
2. X=A⋅B
3. X=¯A+B
4. None of the above
1. AND gate
2. NOR gate
3. OR gate
4. NOT gate
| 1. | the attraction of free electrons of the n-region. |
| 2. | the higher hole concentration in the p-region than that in the n-region. |
| 3. | the higher concentration of electrons is in the p-region than that in the n-region. |
| 4. | the potential difference across the p-n junction. |
Two ideal diodes are connected to a battery as shown in the circuit. The current supplied by the battery is:
| 1. | 0.75 A | 2. | zero |
| 3. | 0.25 A | 4. | 0.5 A |
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