Q. No.Match the items in List-I with their corresponding descriptions in List-II:
Codes:
| List-I | List-II | ||
| (a) | Intrinsic semiconductor | (e) | Prepared by adding phosphorus |
| (b) | \(\mathrm{n}\text-\)type semiconductor | (f) | The width is nearly one micron |
| (c) | \(\mathrm{p}\text-\)type semiconductor | (g) | Silicon |
| (d) | Depletion layer | (h) | Prepared by adding indium |
Codes:
| 1. | (a)-(g), (b)-(e), (c)-(h), (d)-(f) |
| 2. | (a)-(h), (b)-(f), (c)-(e), (d)-(g) |
| 3. | (a)-(e), (b)-(g), (c)-(f), (d)-(h) |
| 4. | (a)-(f), (b)-(h), (c)-(g), (d)-(e) |
Subtopic: Â Types of Semiconductors |
 92%
From NCERT
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Suitable impurities are added to a semiconductor depending on its use. This is to:
| 1. | increase its electrical resistivity |
| 2. | increase its electrical conductivity |
| 3. | increase its life |
| 4. | enable it to tolerate higher voltage |
Subtopic: Â Types of Semiconductors |
 90%
From NCERT
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A semiconductor is known to have an electron concentration of \(8\times 10^{13}~\text{cm}^{-3},\) and a hole concentration of \(5\times 10^{2}~\text{cm}^{-3}.\) The semiconductor is:
| 1. | \(\mathrm{n}\text-\)type | 2. | \(\mathrm{p}\text-\)type |
| 3. | intrinsic | 4. | insulator |
Subtopic: Â Types of Semiconductors |
 87%
From NCERT
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Hole is:
| 1. | an anti-particle of electron. |
| 2. | a vacancy created when an electron leaves a covalent bond. |
| 3. | absence of free electrons. |
| 4. | an artificially created particle. |
Subtopic: Â Types of Semiconductors |
 89%
From NCERT
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A \(\mathrm{Ge}\) specimen is doped with \(\mathrm{Al}.\) The concentration of acceptor atoms is approximately \(10^{24}~\text{m}^{-3}.\) Given that intrinsic carrier concentration is nearly \(10^{19}~\text{m}^{-3},\) then the concentration of electrons in the specimen is nearly:
1. \(10^{10}~\text{m}^{-3}\)
2. \(10^{14}~\text{m}^{-3}\)
3. \(10^{19}~\text{m}^{-3}\)
4. \(10^{18}~\text{m}^{-3}\)
1. \(10^{10}~\text{m}^{-3}\)
2. \(10^{14}~\text{m}^{-3}\)
3. \(10^{19}~\text{m}^{-3}\)
4. \(10^{18}~\text{m}^{-3}\)
Subtopic: Â Types of Semiconductors |
 84%
From NCERT
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To make ordinary silicon into a \(\mathrm{p\text-}\)type semiconductor, you might add to it:
| 1. | Indium | 2. | Antimony |
| 3. | Germanium | 4. | Carbon |
Subtopic: Â Types of Semiconductors |
 84%
From NCERT
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If a small amount of aluminium is added to the silicon crystal:
| 1. | its resistance decreases. |
| 2. | it becomes a \(\mathrm{p\text-}\)type semiconductor. |
| 3. | there will be fewer free electrons than holes in the semiconductor. |
| 4. | All of these are correct. |
Subtopic: Â Types of Semiconductors |
 75%
From NCERT
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An intrinsic Germanium \(\mathrm{(Ge)}\) semiconductor having \(2.5 \times 10^{29}\) atoms per \(\text m^3\) is doped uniformly by trivalent aluminium at \(1~\text{ppm}.\)If the thermally generated electron concentration at room temperature is \(n_i=10^{17}/\text m^3,\) the resulting electron concentration after doping at the same temperature will be:
1. \(2.5 \times 10^{29}~\text m^{-3}\)
2. \(4 \times 10^{10}~\text m^{-3}\)
3. \(2.5 \times 10^{18}~\text m^{-3}\)
4. \(4 \times 10^{20}~\text m^{-3}\)
1. \(2.5 \times 10^{29}~\text m^{-3}\)
2. \(4 \times 10^{10}~\text m^{-3}\)
3. \(2.5 \times 10^{18}~\text m^{-3}\)
4. \(4 \times 10^{20}~\text m^{-3}\)
Subtopic: Â Types of Semiconductors |
 72%
From NCERT
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The charge on a \(\mathrm{p}\)-type semiconductor is:
| 1. | neutral |
| 2. | negative |
| 3. | positive |
| 4. | may be positive or negative |
Subtopic: Â Types of Semiconductors |
 74%
From NCERT
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Pure \(\mathrm{Si}\) at \(500~\text K\) has an equal number of electrons \((n_i)\) and the hole \((n_h)\) concentration of \(1.5\times10^{16}~\text{m}^{-3}.\) Doping by indium increases the hole concentration \(n_h\) to \(4.5\times 10^{22}~\text{m}^{-3}.\) The doped semiconductor is of:
| 1. | \(\mathrm{n}\text-\)type with electron concentration \(n_{e}=5\times10^{22}~\text{m}^{-3}\) |
| 2. | \(\mathrm{p}\text-\)type with electron concentration \(n_{e}=2.5\times10^{23}~\text{m}^{-3}\) |
| 3. | \(\mathrm{n}\text-\)type with electron concentration \(n_{e}=2.5\times10^{10}~\text{m}^{-3}\) |
| 4. | \(\mathrm{p}\text-\)type with electron concentration \(n_{e}=5\times10^{9}~\text{m}^{-3}\) |
Subtopic: Â Types of Semiconductors |
 71%
From NCERT
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