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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: Â Types of Semiconductors |
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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: Â Applications of PN junction |
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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: Â Logic gates |
 59%
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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: Â Types of Semiconductors |
 82%
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: Â Logic gates |
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From NCERT
NEET - 2020
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Subtopic: Â PN junction |
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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: Â Rectifier |
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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: Â Energy Band theory |
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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: Â PN junction |
 65%
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The truth table for the given logic circuit is:
| 1. |
|
|||||||||||||||
| 2. |
|
|||||||||||||||
| 3. |
|
|||||||||||||||
| 4. |
|
Subtopic: Â Logic gates |
 61%
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NEET - 2022
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