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Q. No.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 |
 75%
Level 2: 60%+
NEET - 2022
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The solids which have the negative temperature coefficient of resistance are:
| 1. | insulators only |
| 2. | semiconductors only |
| 3. | insulators and semiconductors |
| 4. | metals |
Subtopic: Â Energy Band theory |
 60%
Level 2: 60%+
NEET - 2020
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A \(\mathrm{p} \text-\)type extrinsic semiconductor is obtained when Germanium is doped with:
1. antimony
2. phosphorous
3. arsenic
4. boron
1. antimony
2. phosphorous
3. arsenic
4. boron
Subtopic: Â Types of Semiconductors |
 76%
Level 2: 60%+
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 |
 52%
Level 3: 35%-60%
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%
Level 1: 80%+
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: Â Types of Semiconductors |
 83%
Level 1: 80%+
NEET - 2019
Hints
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 |
 81%
Level 1: 80%+
AIPMT - 2013
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\(\mathrm{C}\) and \(\mathrm{Si}\) both have the same lattice structure, having \(4\) bonding electrons in each. However, \(\mathrm{C}\) is an insulator whereas \(\mathrm{Si}\) is an intrinsic semiconductor. This is because:
| 1. | in the case of \(\mathrm{C},\) the valence band is not completely filled at absolute zero temperature. |
| 2. | in the case of \(\mathrm{C},\) the conduction band is partly filled even at absolute zero temperature. |
| 3. | the four bonding electrons in the case of \(\mathrm{C}\) lie in the second orbit, whereas in the case of \(\mathrm{Si},\) they lie in the third. |
| 4. | the four bonding electrons in the case of \(\mathrm{C}\) lie in the third orbit, whereas for \(\mathrm{Si},\) they lie in the fourth orbit. |
Subtopic: Â Energy Band theory |
 72%
Level 2: 60%+
NEET - 2012
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Zener diode works:
| 1. | in forward bias only. |
| 2. | in reverse bias only. |
| 3. | as a voltage regulator in forward bias and as a simple pn junction diode in reverse bias. |
| 4. | as a voltage regulator in reverse bias and as a simple pn junction diode in forward bias. |
Subtopic: Â Applications of PN junction |
 54%
Level 3: 35%-60%
NEET - 2024
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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 |
 64%
Level 2: 60%+
NEET - 2022
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