Three ideal diodes are connected to the battery as shown in the circuit. The current supplied by the battery is:

                         

1. Zero
2. \(4~\text{A}\)
3. \(2~\text{A}\)
4. \(6~\text{A}\)

Subtopic:  PN junction |
 77%
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In a common emitter transistor amplifier, the audio signal voltage across resistance of 1 kΩ is 2V. If the base resistance is 200Ω and the current amplification factor is 50, the input signal voltage will be

(1) 4 mV

(2) 8 mV

(3) 16 mV

(4) 32 mV

 

Subtopic:  Transistor (OLD NCERT) |
 70%
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If a small amount of aluminium is added to the silicon crystal:

1. its resistance decreases.
2. it becomes a p-type semiconductor.
3. there will be fewer free electrons than holes in the semiconductor.
4. All of these are correct.
Subtopic:  Types of Semiconductors |
 75%
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A transistor is operated in common emitter configuration at Vc = 10V. When base current is changed from 10mA to 30mA, it produces a change in emitter current from 2A to 4A, the current amplification factor is

1.  100

2.  99

3.  10

4.  9

Subtopic:  Applications of Transistor (OLD NCERT) |
 52%
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When a p-n junction is forward biased, then:

1. the depletion region becomes thick.
2. the p-side is at a higher potential than n side.
3. the current flowing is zero.
4. the effective resistance is of the order of \(10^6 ~\Omega\).

Subtopic:  PN junction |
 83%
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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) |
 63%
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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 |
 87%
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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) |
 74%
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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 |
 83%
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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 |
 66%
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