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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.
(I) \(\text{If}~V_i>2~\text{V}, ~\text{then}~V_o = V_i\)
(II) \(\text{If}~V_i<2~\text{V}, ~\text{then}~V_o = 2~\text{V}\)
 
1. (I) is True.
2. (II) is True.
3. (I) and (II) are both True.
4. (I) and (II) are both False.
Subtopic:  PN junction |
Level 3: 35%-60%
Hints
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:  PN junction |
 73%
Level 2: 60%+
Hints

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:  PN junction |
 84%
Level 1: 80%+
NEET - 2014
Hints
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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:  PN junction |
 86%
Level 1: 80%+
AIPMT - 2011
Hints

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:  Applications of PN junction |
 72%
Level 2: 60%+
Hints

In an unbiased p-n 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 n side to p side

4. Both 2 & 3

Subtopic:  PN junction |
 60%
Level 2: 60%+
Hints
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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:  PN junction |
 70%
Level 2: 60%+
Hints
\(A\) and \(B\) are the inputs for the given logic gate. The output \(Y\) will be:

    
 
1. 2.
3. 4.
Subtopic:  Logic gates |
 76%
Level 2: 60%+
Hints
Zener diode is not used for:
1. oscillatory circuit 2. current amplification
3. voltage amplification 4. all of the above
Subtopic:  Applications of PN junction |
 69%
Level 2: 60%+
Hints
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For a Zener diode used as a voltage regulator, the connections are as follows:
(I) In forward bias
(II) In reverse bias
(III) In parallel with the load
(IV) In series with the load

Choose the correct option from the options given below:
1. (I) and (II) only
2. (II) and (III) only
3. only (I)
4. only (IV)
Subtopic:  Applications of PN junction |
 87%
Level 1: 80%+
Hints
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