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 |
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh

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If a small amount of aluminium is added to the silicon crystal

1.  Its resistance is decreased

2.  It becomes a p-type semiconductor

3.  There will be less free-electron than holes in semiconductor

4.  All of these are correct

Subtopic:  Types of Semiconductors |
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh

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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 |
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh

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When a p-n junction is forward biased:

1.  Depletion region becomes thick

2.  p-side is at a higher potential than n side

3.  Current flowing is zero

4.  Effective resistance is of the order of 106W

Subtopic:  PN junction |
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh

Difficulty Level:


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 |
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh

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Which of the following is correct for n-type semiconductor?

1.  Electron is 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 |
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh

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If α be the current gain of a transistor in common base mode and β be the current gain incommon emitter mode then-

1.  α < 1 

2.  β > 1 

3.  α = β1 + β

4.  All of these

 

Subtopic:  Transistor |
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh

Difficulty Level:


In semiconductors, which of the following gives the law of mass action (where symbols have their usual meanings)-

1.  n1 = ne = nh  

2.  ni2 = nenh  

3.  nh >> ne  

4.  nh << ne

 

Subtopic:  Types of Semiconductors |
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh

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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 |
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh

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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 |
To view explanation, please take trial in the course below.
NEET 2022 - Target Batch - Aryan Raj Singh

Difficulty Level: