Which one of the following represents forward biased circuit?

1. 

2. 

3. 

4. 

Subtopic:  PN junction |
 84%
From NCERT
NEET - 2017
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To get output 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 |
 85%
From NCERT
NEET - 2016
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An n-p-n transistor is connected in the common base configuration in a given amplifier. A load resistance of 800Ω is connected in the collector circuit and the voltage drop across it is 0.8 V. If the current amplification factor is 0.96 and the input resistance of the circuits is 192 Ω the voltage gain and the power gain of the amplifier will respectively be

1. 3.69,3.84
2. 4,4
3. 4,3.69
4. 4,3.84

Subtopic:  Applications of Transistor (OLD NCERT) |
 63%
From NCERT
NEET - 2016
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If in a \(\mathrm{p\text-n}\) junction, a square input signal of \(10\) V is applied as shown, then the output across \(R_L\) will be:
              

1. 2.
3. 4.
Subtopic:  Rectifier |
 66%
From NCERT
NEET - 2015
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The given graph represents the \(V\text-I\) characteristics of a semiconductor device. Which of the following statements is correct?
 

1. It is a \(V\text-I\) characteristic of a solar cell where the point \(A\) represents open-circuit voltage and the point \(B\) represents short-circuit current.
2. It is for a solar cell and points \(A\) and \(B\) represents open-circuit voltage and current respectively.
3. It is for a photodiode and points \(A\) and \(B\) represents open-circuit voltage and current respectively.
4. It is for an LED and points \(A\) and \(B\) represents open-circuit voltage and short-circuit current respectively.
Subtopic:  Applications of PN junction |
 69%
From NCERT
NEET - 2014
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The output (x) of logic circuit shown in figure will be 

 

(1) X=A=·B=

(2) X=A.B¯

(3)X=A·B

(4)X=A+B¯

Subtopic:  Logic gates |
 66%
From NCERT
NEET - 2013
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The input resistance of a silicon transistor is

100 Ω. Base current is changed by 40 μA

which results in a change in collector current

by 2 mA. This transistor is used as a common-

emitter amplifier with a load resistance of 4 kΩ.

The voltage gain of the amplifier is

1. 2000

2. 3000

3. 4000

4. 1000

Subtopic:  Transistor (OLD NCERT) |
 80%
From NCERT
NEET - 2012
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Symbolic representation of four logic gates

are shown as

(i) 

(ii) 

(iii) 

(iv) 

Pick out which ones are for AND, NAND and 

NOT gates, respectively.

1. (iii), (ii)and (i)

2. (iii), (ii) and (iv)

3. (ii), (iv) and (iii)

4. (ii), (iii) and (iv)

Subtopic:  Logic gates |
 90%
From NCERT
NEET - 2011
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In the following figure, the diodes which are forward biased, are

                                                                    

                                                                  

1.  III and IV only

2.  I and III only

3.  II only

4.  II and IV only

Subtopic:  PN junction |
 83%
From NCERT
NEET - 2011
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Pure \(\mathrm{Si}\) at \(500~\text K\)  has an equal number of electrons \((n_i)\) and the hole \((n_h)\) concentration of \(1.5\times10^{16}~\text{m}^{-3}.\) Doping by indium increases the hole concentration \(n_h\) to \(4.5\times 10^{22}~\text{m}^{-3}.\) The doped semiconductor is of:
1. \(\mathrm{n}\text-\)type with electron concentration \(n_{e}=5\times10^{22}~\text{m}^{-3}\)
2. \(\mathrm{p}\text-\)type with electron concentration \(n_{e}=2.5\times10^{23}~\text{m}^{-3}\)
3. \(\mathrm{n}\text-\)type with electron concentration \(n_{e}=2.5\times10^{10}~\text{m}^{-3}\)
4. \(\mathrm{p}\text-\)type with electron concentration \(n_{e}=5\times10^{9}~\text{m}^{-3}\)
Subtopic:  Types of Semiconductors |
 70%
From NCERT
NEET - 2011
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