A semiconductor is known to have an electron concentration of \(8\times 10^{13}~\text{cm}^{-3}\) and a hole concentration of \(5\times 10^{2}~\text{cm}^{-3}\). The semiconductor is:
1. \(\mathrm{n}\text-\)type
2. \(\mathrm{p}\text-\)type
3. intrinsic
4. insulator

Subtopic:  Types of Semiconductors |
 87%
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In the given figure, the potential difference between \(A\) and \(B\) is:

1. \(0\) 2. \(5\) volt
3. \(10\) volt 4. \(15\) volt
Subtopic:  PN junction |
 55%
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PMT - 2000
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In the given circuit power 
developed in 1 resistor is

     

1.  36 mW

2.  12 mW

3.  144 mW

4.  64 mW

 

Subtopic:  Applications of PN junction |
 64%
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The current through an ideal p-n junction diode shown in the circuit will be -

                                       

1.  5 A

2.  0.2 A 

3.  0.6 A

4.  Zero

Subtopic:  PN junction |
 60%
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The conductivity of an n-type semiconductor whose density of conduction electrons is ne, Density of holes is nh, Mobility of conduction electrons is meand Mobility of holes is mh, will be

1.  enemh + neme 

2.  eneme + nhme  

3.  eneme + mh  

4.  eneme + nhmh 

Subtopic:  Types of Semiconductors |
 65%
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In semiconductors, which of the following gives the law of mass action?
(where symbols have their usual meanings.)
1. \(n_i=n_e=n_h\)
2. \(n_i^2=n_en_h\)
3. \(n_h>> n_e\)
4. \(n_h<<n_e\)

Subtopic:  Types of Semiconductors |
 82%
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If α be the current gain of a transistor in common base mode and β be the current gain in
common emitter mode then-

1.  α < 1 

2.  β > 1 

3.  α = β1 + β

4.  All of these

 

Subtopic:  Transistor (OLD NCERT) |
 73%
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Which of the following is correct for \(\mathrm{n}\)-type semiconductors?

1. electron is the majority carriers and trivalent atoms are dopants.
2. electrons are majority carriers and pentavalent atoms are dopants.
3. holes are majority carriers and pentavalent atoms are dopants.
4. holes are majority carriers and trivalent atoms are dopants.
Subtopic:  Types of Semiconductors |
 86%
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When a transistor is used as a switch it is in:

1.  Active state

2.  Cut off state

3.  Saturation state

4.  Both cut off state and saturation state are possible

Subtopic:  Applications of Transistor (OLD NCERT) |
 62%
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When a \(\mathrm{p\text-n}\) junction is forward biased, then:
1. the depletion region becomes thick.
2. the \(\mathrm{p}\text-\)side is at a higher potential than \(\mathrm{n\text-}\)side.
3. the current flowing is zero.
4. the effective resistance is of the order of \(10^6 ~\Omega\).
Subtopic:  PN junction |
 82%
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