For the logic circuit shown, the truth table is:

 

1.
A B Y
0 0 0
0 1 1
1 0 1
1 1 1
2.
A B Y
0 0 1
0 1 1
1 0 1
1 1 0
3.
A B Y
0 0 1
0 1 1
1 0 1
1 1 0
4.
A B Y
0 0 0
0 1 0
1 0 0
1 1 1

Subtopic:  Logic gates |
 69%
From NCERT
NEET - 2020
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The increase in the width of the depletion region in a \(\mathrm{p\text{-}n}\) junction diode is due to:

1. reverse bias only
2. both forward bias and reverse bias
3. increase in forwarding current
4. forward bias only
Subtopic:  PN junction |
 78%
From NCERT
NEET - 2020
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The solids which have the negative temperature coefficient of resistance are:

1. insulators only
2. semiconductors only
3. insulators and semiconductors
4. metals
Subtopic:  Energy Band theory |
 56%
From NCERT
NEET - 2020
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Out of the following which one is a forward-biased diode?

1.  
2.
3.
4.
Subtopic:  PN junction |
 83%
From NCERT
NEET - 2020
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Which of the following gate is called the universal gate? 
1. \(\mathrm{OR}\) gate 
2. \(\mathrm{AND}\) gate 
3. \(\mathrm{NAND}\) gate 
4. \(\mathrm{NOT}\) gate 

Subtopic:  Logic gates |
 77%
From NCERT
NEET - 2020
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An intrinsic semiconductor is converted into an \(\mathrm{n\text{-}}\)type extrinsic semiconductor by doping it with: 

1. phosphorous 2. aluminium
3. silver 4. germanium
Subtopic:  Types of Semiconductors |
 79%
From NCERT
NEET - 2020
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The circuit diagram shown here corresponds to the logic gate:

    
1. \(\mathrm{NOR}\)
2. \(\mathrm{AND}\)
3. \(\mathrm{OR}\)
4. \(\mathrm{NAND}\)

Subtopic:  Logic gates |
From NCERT
NEET - 2019
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An LED is constructed from a \(\mathrm{p\text{-}n}\) junction diode using \(\mathrm{GaAsP}\). The energy gap is \(1.9~\text{eV}\). The wavelength of the light emitted will be equal to:
1. \(10.4 \times 10^{-26} \text{m}\)
2. \(654~ \text{nm}\)
3. \(654~ \text{m}\)
4. \(654\times 10^{-11}~\text{m}\)

Subtopic:  Applications of PN junction |
 78%
From NCERT
NEET - 2019
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The electron concentration in an \(\mathrm{n\text-}\)type semiconductor is the same as the hole concentration in a \(\mathrm{p\text{-}}\)type semiconductor. An external field (electric) is applied across each of them. Compare the currents in them.

1. current in \(\mathrm{n\text-}\)type \(>\) current in \(\mathrm{p\text{-}}\)type.
2. no current will flow in \(\mathrm{p\text{-}}\)type, current will only flow in \(\mathrm{n\text-}\)type.
3. current in \(\mathrm{n\text-}\)type \(=\) current in \(\mathrm{p\text{-}}\)type.
4. current in \(\mathrm{p\text{-}}\)type \(>\) current in \(\mathrm{n\text-}\)type.
Subtopic:  Types of Semiconductors |
From NCERT
NEET - 2021
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Consider the following statements (A). and (B). and identify the correct answer. 

(A). A zener diode is connected in reverse bias when used as a voltage regulator.
(B). The potential barrier of p-n junction lies between 0.2 V to 0.3 V.

1. (A) is correct and (B) is incorrect.
2. (A) is incorrect and (B) is correct.
3. (A) and (B) both are correct.
4. (A) and (B) both are incorrect.

Subtopic:  Applications of PN junction |
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