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Q. No.

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 |
 59%
Level 3: 35%-60%
NEET - 2021
Hints
Given below are two statements:
Statement A: A Zener diode is connected in reverse bias when used as a voltage regulator.
Statement B: The potential barrier of \(\mathrm{p\text-n}\) junction lies between \(0.2\) V to \(0.3\) V.
 
1. Statement A is correct and Statement B is incorrect.
2. Statement A is incorrect and Statement B is correct.
3. Statement A and Statement B both are correct.
4. Statement A and Statement B both are incorrect.
Subtopic:  Applications of PN junction |
 52%
Level 3: 35%-60%
NEET - 2021
Hints

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 |
 52%
Level 3: 35%-60%
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 |
 82%
Level 1: 80%+
NEET - 2020
Hints

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 |
 79%
Level 2: 60%+
NEET - 2020
Hints

Out of the following which one is a forward-biased diode?

1.  
2.
3.
4.
Subtopic:  PN junction |
 86%
Level 1: 80%+
NEET - 2020
Hints
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In half-wave rectification, if the input frequency is \(60\) Hz, the output frequency will be:
1. \(120\) Hz 2. zero
3. \(30\) Hz 4. \(60\) Hz
Subtopic:  Rectifier |
 68%
Level 2: 60%+
NEET - 2022
Hints
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 |
 75%
Level 2: 60%+
NEET - 2022
Hints
In the given circuits \((a),\) \((b),\) and \((c),\) the potential drop across the two \({\mathrm{p\text-n}}\) junctions is equal in:

            
1. both circuits \((a)\) and \((c)\)
2. circuit \((a)\) only
3. circuit \((b)\) only
4. circuit \((c)\) only
Subtopic:  PN junction |
 64%
Level 2: 60%+
NEET - 2022
Hints
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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 |
 62%
Level 2: 60%+
NEET - 2022
Hints
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