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Q. No.In the circuit shown in the diagram given below, \(R\) is a small resistor, \(V_i\) is the input voltage between \(A\) & \(B\) while \(V_o\) is the output voltage between \(C\) & \(D\).
Consider the following two statements and mark the correct option.
1. I is True.
2. II is True.
3. I and II are both True.
4. I and II are both False.
Consider the following two statements and mark the correct option.
| (I) | \(\text{If}~V_i>2~\text{V}, ~\text{then}~V_o = V_i\) |
| (II) | \(\text{If}~V_i<2~\text{V}, ~\text{then}~V_o = 2~\text{V}\) |
2. II is True.
3. I and II are both True.
4. I and II are both False.
Subtopic: Â PN junction |
From NCERT
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The dynamic resistance of a diode is given by; \(R=\dfrac{26}{i(\text{mA})}~\Omega,\) where \(i\) is the diode current.
| Statement I: | If the current through the diode increases, then the dynamic resistance decreases. |
| Statement II: | If the temperature of the diode is increased, with the potential difference fixed, the dynamic resistance decreases. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: Â PN junction |
 69%
From NCERT
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The barrier potential of a \(\mathrm{p\text{-}n}\) 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)
Subtopic: Â PN junction |
 83%
From NCERT
NEET - 2014
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In the following figure, the diodes which are forward biased are:
| (a) |  |
| (b) |  |
| (c) |  |
| (d) |  |
1. (a), (b) and (d)
2. (c) only
3. (a) and (c)
4. (b) and (d)
Subtopic: Â PN junction |
 83%
From NCERT
AIPMT - 2011
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The LED:
| 1. | is reverse-biased. |
| 2. | is forward-biased. |
| 3. | can be made of \(\mathrm{GaAs}.\) |
| 4. | both (2) and (3) are correct. |
Subtopic: Â Applications of PN junction |
 70%
From NCERT
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In an unbiased - junction diode
1. p-type side is at higher potential than n-type side
2. p-type side is at lower potential than n-type side
3. Electric field is directed from side to side
4. Both 2 & 3
Subtopic: Â PN junction |
 59%
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The \((I\text-V)\) characteristics of a \(\mathrm{p\text-n}\) junction diode is as shown. If \(R_1\) and \(R_2\) be the dynamic resistance of the \(\mathrm{p\text-n}\) junction when (i) a forward bias of \(1\) volt is applied and (ii) a forward bias of \(2\) volts is applied respectively, then \(\frac{R_1}{R_2}=?\)
1. \(160\)
2. \(16\)
3. \(1.6\)
4. \(0.16\)
Subtopic: Â PN junction |
 71%
From NCERT
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Subtopic: Â Logic gates |
 75%
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Zener diode is not used for:
1. oscillatory circuit
2. current amplification
3. voltage amplification
4. all of the above
1. oscillatory circuit
2. current amplification
3. voltage amplification
4. all of the above
Subtopic: Â Applications of PN junction |
 70%
From NCERT
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A Zener diode when used as a voltage regulator is connected:
Choose the correct option:
| i. | in forward bias |
| ii. | in reverse bias |
| iii. | in parallel with the load |
| iv. | in series with the load |
| 1. | (i) and (ii) are correct |
| 2. | (ii) and (iii) are correct |
| 3. | only (i) is correct |
| 4. | only (iv) is correct |
Subtopic: Â Applications of PN junction |
 88%
From NCERT
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