A transistor is operated in common emitter configuration at VC=2 V such that a change in the base current from 100 μA to 300 μA produces a change in the collector current from 10 mA to 20 mA. The current gain is 

1. 75                                               2. 100

3. 25                                                4. 50

Subtopic:  Transistor (OLD NCERT) |
 83%
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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A Zener diode, having breakdown voltage equal to \(15\) V, is used in a voltage regulator circuit, as shown in the figure. The current through the diode is:

                      
1. \(10\) mA
2. \(15\) mA
3. \(20\) mA
4. \(5\) mA

Subtopic:  Applications of PN junction |
 61%
From NCERT
NEET - 2011
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Which one of the following statement is false?

(1) Pure Si doped with trivalent impurities gives a p-type semiconductor 

(2) Majority carries in a n-type semiconductor are holes

(3) Minority carries in a p-type semiconductor are electrons

(4) The resistance of intrinsic semiconductor decreases with increase of temperature 

Subtopic:  Types of Semiconductors |
 84%
From NCERT
NEET - 2010
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To get an output Y =1 from the circuit shown below, the input must be

        A     B     C

1.   0      1     0

2.   0      0     1

3.   1      0     1

4.   1      0     0

Subtopic:  Logic gates |
 91%
From NCERT
NEET - 2010
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The following figure shows a logic gate circuit with two inputs A and B and the output Y. The voltage waveforms of A, B and Y are as given

                            

The logic gate is 

1. NOR gate                                                 

2. OR gate

3. AND  gate                                                 

4. NAND gate

Subtopic:  Logic gates |
 69%
From NCERT
NEET - 2010
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For transistor action:

(a) the base, emitter and collector regions should have similar size and doping concentrations.
(b) the base regions must be very thin and lightly doped.
(c) the emitter-base junction is forward biased and the base-collector junction is reverse biased.
(d) both the emitter-base junction as well as the base-collector junction are forward biased.

Which of the following pairs of statements is correct?
1. (d) and (a)
2. (a) and (b)
3. (b) and (c)                                       
4. (c) and (d)

Subtopic:  Transistor (OLD NCERT) |
 86%
From NCERT
NEET - 2010
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A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength 

1. 6000 A                                   
2. 4000 nm
3. 6000 nm                                 
4. 4000 A

Subtopic:  Applications of PN junction |
 60%
From NCERT
NEET - 2009
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The circuit is equivalent to

1. AND gate                              2. NAND gate

3. NOR gate                              4. OR gate 

Subtopic:  Logic gates |
 66%
From NCERT
NEET - 2008
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In the forward bias arrangement of a PN-junction diode

(1) The N-end is connected to the positive terminal of the battery

(2) The P-end is connected to the positive terminal of the battery

(3) The direction of current is from N-end to P-end in the diode

(4) The P-end is connected to the negative terminal of battery

Subtopic:  PN junction |
 94%
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