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Q. No.

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
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

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
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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 |
 65%
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 |
 61%
Level 2: 60%+
NEET - 2022
Hints
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