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Q. No.
A full wave rectifier circuit consists of two \(\mathrm{p\text-n}\) junction diodes, a centre-tapped transformer, capacitor and a load resistance. Which of these components remove the ac ripple from the rectified output?
1. load resistance
2. a centre-tapped transformer
3. \(\mathrm{p\text-n}\) junction diodes
4. capacitor
Subtopic:  Rectifier |
 58%
Level 3: 35%-60%
NEET - 2023
Hints
Given below are two statements:
Statement I: Photovoltaic devices can convert optical radiation into electricity.
Statement II: The Zener diode is designed to operate under reverse bias in the breakdown.
 
1. Statement I is incorrect but Statement II is correct.
2. Both Statement I and Statement II are correct.
3. Both Statement I and Statement II are incorrect.
4. Statement I is correct but Statement II is incorrect.
Subtopic:  Applications of PN junction |
 78%
Level 2: 60%+
NEET - 2023
Hints
For the following logic gate, the truth table is: 
       
1.
\(\mathrm A\) \(\mathrm B\) \(\mathrm C\)
\(0\) \(0\) \(0\)
\(0\) \(1\) \(0\)
\(1\) \(0\) \(0\)
\(1\) \(1\) \(1\)
2.
\(\mathrm A\) \(\mathrm B\) \(\mathrm C\)
\(0\) \(0\) \(1\)
\(0\) \(1\) \(1\)
\(1\) \(0\) \(1\)
\(1\) \(1\) \(0\)
3.
\(\mathrm A\) \(\mathrm B\) \(\mathrm C\)
\(0\) \(0\) \(0\)
\(0\) \(1\) \(1\)
\(1\) \(0\) \(1\)
\(1\) \(1\) \(1\)
4.
\(\mathrm A\) \(\mathrm B\) \(\mathrm C\)
\(0\) \(0\) \(1\)
\(0\) \(1\) \(0\)
\(1\) \(0\) \(1\)
\(1\) \(1\) \(0\)
Subtopic:  Logic gates |
 71%
Level 2: 60%+
NEET - 2023
Hints
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The given circuit is equivalent to:
 
1.
2.
3.
4.
Subtopic:  Logic gates |
 69%
Level 2: 60%+
NEET - 2023
Hints
A \(\mathrm{p} \text-\)type extrinsic semiconductor is obtained when Germanium is doped with:
1. antimony
2. phosphorous
3. arsenic
4. boron
Subtopic:  Types of Semiconductors |
 76%
Level 2: 60%+
NEET - 2023
Hints
    
The above figure shows the circuit symbol of a transistor. Select the correct statements given below:
(A) The transistor has two segments of p-type semiconductor separated by a segment of n-type semiconductor.
(B) The emitter is of moderate size and heavily doped.
(C) The central segment is thin and lightly doped.
(D) The emitter base junction is reverse biased in common emitter amplifier circuit.
 
1. (C) and (D)
2. (A) and (D)
3. (A) and (B)
4. (B) and (C)
Level 3: 35%-60%
NEET - 2023
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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