Which one of the following represents forward biased circuit?

1. 

2. 

3. 

4. 

Subtopic:  PN junction |
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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 p-n junction, a square input signal of 10 V is applied as shown, then the output across RL will be:
              

1. 2.
3. 4.
Subtopic:  Rectifier |
 66%
From NCERT
NEET - 2015
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The given graph represents the V-I characteristic for a semiconductor device. Which of the following statement is correct?

1. It is a V-I characteristic for a solar cell where point A represents open-circuit voltage and point B represents short-circuit current.
2. It is for a solar cell and points A and B represent open-circuit voltage and current respectively.
3. It is for a photodiode and points A and B represent open-circuit voltage and current respectively.
4. It is for a LED and points A and B represent open-circuit voltage and short circuit current respectively.
Subtopic:  Applications of PN junction |
 68%
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) |
 81%
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.

(a) (iii), (ii)and (i)

(b) (iii), (ii) and (iv)

(c) (ii), (iv) and (iii)

(d) (ii), (iii) and (iv)

Subtopic:  Logic gates |
 91%
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 |
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NEET - 2011
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Pure Si at 500 K has equal number of electron (ne) and hole (nh) concentration of 1.5×1016 m-3. Doping by indium increases nh to 4.5×1022 m-3. The doped semiconductor is of:

1. n-type with electron concentration \(n_{e}=5\times10^{22}~m^{-3}\)
2. p-type with electron concentration \(n_{e}=2.5\times10^{23}~m^{-3}\)
3. n-type with electron concentration \(n_{e}=2.5\times10^{10}~m^{-3}\)
4. p-type with electron concentration \(n_{e}=5\times10^{9}~m^{-3}\)
Subtopic:  Types of Semiconductors |
 69%
From NCERT
NEET - 2011
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