The given circuit has two ideal diodes connected as shown in the figure below. The current flowing through the resistance \(R_1\) will be:

1. \(2.5~\text{A}\) 2. \(10.0~\text{A}\)
3. \(1.43~\text{A}\) 4. \(3.13~\text{A}\)

Subtopic:  PN junction | Applications of PN junction |
 87%
Level 1: 80%+
NEET - 2016
Hints

What is the output \(Y\) in the following circuit, when all the three inputs \(A\), \(B\), and \(C\) are first \(0\) and then \(1\)
                          
1. \(0,1\)
2. \(0,0\)
3. \(1,0\)
4. \(1,1\)

Subtopic:  Logic gates |
 83%
Level 1: 80%+
NEET - 2016
Hints

To get output \(Y=1\) for the following circuit, the correct choice for the input is:
  

1. \(A=1,~ B= 0, ~C=0\)
2. \(A=1,~ B= 1, ~C=0\)
3. \(A=1,~ B= 0, ~C=1\)
4. \(A=0,~ B= 1, ~C=0\)

Subtopic:  Logic gates |
 89%
Level 1: 80%+
NEET - 2016
Hints

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Consider the junction diode as an ideal. The value of current flowing through \(AB\) is: 
   
1. \(10^{-2}~\text{A}\)
2. \(10^{-1}~\text{A}\)
3. \(10^{-3}~\text{A}\)
4. \(0~\text{A}\)

Subtopic:  PN junction |
 79%
Level 2: 60%+
NEET - 2016
Hints

In the given figure, a diode \(D\) is connected to an external resistance \(R = 100~\Omega\) and an EMF of \(3.5~\text{V}\). If the barrier potential developed across the diode is \(0.5~\text{V}\), the current in the circuit will be:
  
1. \(30~\text{mA}\)
2. \(40~\text{mA}\)
3. \(20~\text{mA}\)
4. \(35~\text{mA}\)

Subtopic:  PN junction |
 75%
Level 2: 60%+
NEET - 2015
Hints

If in a \(\mathrm{p\text{-}n}\) junction, a square input signal of \(10~\text{V}\) is applied as shown, 

 
then the output across \(R_L\) will be:

1. 2.
3. 4.
Subtopic:  PN junction |
 71%
Level 2: 60%+
NEET - 2015
Hints

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Which logic gate is represented by the following combination of logic gates? 

    
1. \(\mathrm{OR}\)
2. \(\mathrm{NAND}\)
3. \(\mathrm{AND}\)
4. \(\mathrm{NOR}\)
Subtopic:  Logic gates |
 72%
Level 2: 60%+
NEET - 2015
Hints

The given graph represents the \(\mathrm{V\text{-} I}\) characteristic for a semiconductor device.

Which of the following statement is correct?

1. It is a \(\mathrm{V\text{-} I}\) characteristic for the solar cell where point \(\mathrm{A}\) represents open-circuit voltage and point \(\mathrm{B}\) short circuit current.
2. It is for a solar cell and points \(\mathrm{A}\) and \(\mathrm{B}\) represent open-circuit voltage and current, respectively.
3. It is for a photodiode and points \(\mathrm{A}\) and \(\mathrm{B}\) represent open-circuit voltage and current respectively.
4. It is for a LED and points \(\mathrm{A}\) and \(\mathrm{B}\) represent open circuit voltage and short circuit current, respectively.
Subtopic:  Applications of PN junction |
 78%
Level 2: 60%+
AIPMT - 2014
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 an \(\mathrm{n\text-}\)type semiconductor, which of the following statement is true?
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.
Subtopic:  Types of Semiconductors |
 81%
Level 1: 80%+
AIPMT - 2013
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