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  • 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:  Types of Semiconductors |
 76%
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:  Types of Semiconductors |
 52%
From NCERT
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%
From NCERT
NEET - 2020
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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:  Types of Semiconductors |
 82%
From NCERT
NEET - 2019
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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:  Types of Semiconductors |
 81%
From NCERT
AIPMT - 2013
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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:  Types of Semiconductors |
 83%
From NCERT
AIPMT - 2011
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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:  Types of Semiconductors |
 77%
From NCERT
AIPMT - 2011
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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:  Types of Semiconductors |
 87%
From NCERT
AIPMT - 2010
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