A common emitter amplifier has a voltage gain of 50, an input impedance of 100Ω and an output impedance of 200Ω. The power gain of the amplifier is-

1. 500         

2. 1000

3. 1250       

4. 50

Subtopic:  Applications of Transistor (OLD NCERT) |
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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 |
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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) |
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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 |
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NEET - 2009
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The symbolic representation of four logic gates 

                                       

                           (i)                                                                              (ii)

                                

                           (iii)                                                                              (iv)

The logic symbols for OR, NOT and NAND gates are respectively

1. (iii), (iv), (ii)                                           
2. (iv), (i), (iii)
3. (iv), (ii), (i)                                             
4. (i), (iii), (iv) 

Subtopic:  Logic gates |
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From NCERT
NEET - 2009
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A transistor is operated in common-emitter configuration at Vc=2volt such that a change in the base current from 100 μA to 200 μA produces a change in the collector current from 5 mA to 10 mA. The current gain is 

1. 75                               
2. 100
3. 150                             
4. 50

Subtopic:  Transistor (OLD NCERT) |
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Sodium has body-centered packing. The distance between the two nearest atoms is \(3.7~\mathring{A}\). The lattice parameter is:
1. \(6.8~\mathring{A}\)
2. \(4.3~\mathring{A}\)
3. \(3.0~\mathring{A}\)
4. \(8.6~\mathring{A}\)

Subtopic:  Energy Band theory |
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NEET - 2009
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If the lattice parameter for a crystalline structure is 3.6 A0, then the atomic radius in fcc crystal is

1. 1.81A0

2. 2.10A0

3. 2.92A0

4. 1.27A0

Subtopic:  Energy Band theory |
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NEET - 2008
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The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be

1. 90                           

2. 10

3. 1.25                         

4. 100

Subtopic:  Applications of Transistor (OLD NCERT) |
NEET - 2008
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A p-n photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly

1. 10×1014 Hz                             
2. 5×1014 Hz
3. 1×1014 Hz                               
4. 20×1014 Hz

Subtopic:  Energy Band theory | Applications of PN junction |
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