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 |
From NCERT
NEET - 2021
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For the given circuit, the input digital signals are applied at the terminals \(A\), \(B\) and \(C\). What would be the output at terminal \(Y\)?
 

1.
2.
3.
4.
Subtopic:  Logic gates |
 56%
From NCERT
NEET - 2021
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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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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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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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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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In half-wave rectification, if the input frequency is \(60\) Hz, then the output frequency would be:
1. \(120\) Hz
2. zero
3. \(30\) Hz
4. \(60\) Hz
Subtopic:  Rectifier |
 63%
From NCERT
NEET - 2022
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As the temperature increases, the electrical resistance:
1. decreases for conductors but increases for semiconductors
2. increases for both conductors and semiconductors
3. decreases for both conductors and semiconductors
4. increases for conductors but decreases for semiconductors
Subtopic:  Energy Band theory |
 72%
From NCERT
NEET - 2022
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In the given circuits (a), (b) and (c), the potential drop across the two \({\mathrm{p\text-n}}\) junctions are equal in: 
        
1. both circuits (a) and (c)
2. circuit (a) only
3. circuit (b) only
4. circuit (c) only
Subtopic:  PN junction |
 65%
From NCERT
NEET - 2022
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The truth table for the given logic circuit is:
1.
A B C
0 0 0
0 1 1
1 0 0
1 1 1
2.
A B C
0 0 0
0 1 1
1 0 1
1 1 0
3.
A B C
0 0 1
0 1 0
1 0 0
1 1 1
4.
A B C
0 0 1
0 1 0
1 0 1
1 1 0
Subtopic:  Logic gates |
 59%
From NCERT
NEET - 2022
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