- 1(current)
Q. No.A \(\mathrm{p} \text-\)type extrinsic semiconductor is obtained when Germanium is doped with:
| 1. | antimony | 2. | phosphorous |
| 3. | arsenic | 4. | boron |
Subtopic: Â Types of Semiconductors |
 74%
From NCERT
NEET - 2023
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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: Â Types of Semiconductors |
 51%
From NCERT
NEET - 2021
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NEET 2023 - Target Batch - Aryan Raj Singh
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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 |
 80%
From NCERT
NEET - 2020
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NEET 2023 - Target Batch - Aryan Raj Singh
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For a \(\mathrm{p}\text{-}\)type semiconductor, which of the following statements is true?
| 1. | Electrons are the majority carriers and pentavalent atoms are the dopants. |
| 2. | Electrons are the majority carriers and trivalent atoms are the dopants. |
| 3. | Holes are the majority carriers and trivalent atoms are the dopants. |
| 4. | Holes are the majority carriers and pentavalent atoms are the dopants. |
Subtopic: Â Types of Semiconductors |
 80%
From NCERT
NEET - 2019
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NEET 2023 - Target Batch - Aryan Raj Singh
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In an \(\mathrm{n\text-}\)type semiconductor, which of the following statement is true?
| 1. | Electrons are minority carriers and pentavalent atoms are dopants. |
| 2. | Holes are minority carriers and pentavalent atoms are dopants. |
| 3. | Holes are the majority carriers and trivalent atoms are dopants. |
| 4. | Electrons are the majority carriers and trivalent atoms are dopants. |
Subtopic: Â Types of Semiconductors |
 79%
From NCERT
AIPMT - 2013
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NEET 2023 - Target Batch - Aryan Raj Singh
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If a small amount of antimony is added to germanium crystal:
| 1. | the antimony becomes an acceptor atom |
| 2. | there will be more free electrons than holes in the semiconductor |
| 3. | its resistance is increased |
| 4. | it becomes a \(p\small{-}\)type semiconductor |
Subtopic: Â Types of Semiconductors |
 82%
From NCERT
AIPMT - 2011
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NEET 2023 - Target Batch - Aryan Raj Singh
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Pure Si at \(500~\text{K}\) has an equal number of electron \((n_e)\) and hole\((n_h)\) concentrations of \(1.5\times10^{16}~\text{m}^{-3}\). Doping by indium increases \(n_h\) to \(4.5\times10^{22}~\text{m}^{-3}\). The doped semiconductor is of:
| 1. | \(p\)-type with electron concentration \(n_e=5\times10^9~\text{m}^{-3}\) |
| 2. | \(n\)-type with electron concentration \(n_e=5\times10^{22}~\text{m}^{-3}\) |
| 3. | \(p\)-type with electron concentration \(n_e=2.5\times10^{10}~\text{m}^{-3}\) |
| 4. | \(n\)-type with electron concentration \(n_e=2.5\times10^{23}~\text{m}^{-3}\) |
Subtopic: Â Types of Semiconductors |
 76%
From NCERT
AIPMT - 2011
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh
Which one of the following statements is false?
| 1. | Pure Si doped with trivalent impurities gives a p-type semiconductor. |
| 2. | The majority of carriers in an n-type semiconductor are holes. |
| 3. | The minority carriers in a p-type semiconductor are electrons. |
| 4. | The resistance of intrinsic semiconductors decreases with an increase in temperature. |
Subtopic: Â Types of Semiconductors |
 86%
From NCERT
AIPMT - 2010
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NEET 2023 - Target Batch - Aryan Raj Singh
- 1(current)
Q. No.
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