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%
From NCERT
NEET - 2015
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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 |
 72%
From NCERT
NEET - 2015
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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 |
 67%
From NCERT
NEET - 2015
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

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 |
 75%
From NCERT
AIPMT - 2014
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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 |
 83%
From NCERT
NEET - 2014
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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 |
 79%
From NCERT
AIPMT - 2013
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

The output \((X)\) of the logic circuit shown in the figure will be: 
  
1. \(X= \overline{A\cdot B}\)
2. \(X = A\cdot B\)
3. \(X= \overline{A+ B}\)
4. \(X=\overline{\overline{A}} \cdot \overline{\overline{B}}\)

Subtopic:  Logic gates |
 77%
From NCERT
AIPMT - 2013
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The output from a \(\mathrm{NAND}\) gate is divided into two in parallel and fed to another \(\mathrm{NAND}\) gate. The resulting gate is a:

 
1. \(\mathrm{AND}\) gate
2. \(\mathrm{NOR}\) gate
3. \(\mathrm{OR}\) gate
4. \(\mathrm{NOT}\) gate
Subtopic:  Logic gates |
 78%
From NCERT
NEET - 2013
Please attempt this question first.
Hints
Please attempt this question first.

In an unbiased \(\mathrm{p\text{-}n}\) junction, holes diffuse from the \(\mathrm{p\text{-}}\)regions to \(\mathrm{n\text{-}}\)regions because of: 
1. the attraction of free electrons of the \(\mathrm{n\text{-}}\)region.
2. the higher hole concentration in the \(\mathrm{p\text{-}}\)region than that in the \(\mathrm{n\text{-}}\)region. 
3. the higher concentration of electrons is in the \(\mathrm{p\text{-}}\)region than that in the \(\mathrm{n\text{-}}\)region. 
4. the potential difference across the \(\mathrm{p\text{-}n}\) junction. 
Subtopic:  PN junction |
 68%
From NCERT
NEET - 2013
Please attempt this question first.
Hints
Please attempt this question first.

advertisementadvertisement

Two ideal diodes are connected to a battery as shown in the circuit. The current supplied by the battery is:
    
1. \(0.75~\text{A}\)
2. zero
3. \(0.25~\text{A}\)
4. \(0.5~\text{A}\)

Subtopic:  PN junction |
 86%
From NCERT
AIPMT - 2012
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch