Q. No.Match List-I with List-II.
| 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 |
| 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 |
 93%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
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 |
 89%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
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
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
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 |
 87%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
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. | \(10^{18}~\text{m}^{-3}\) |
Subtopic: Â Types of Semiconductors |
 82%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
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 |
 82%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
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
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
An intrinsic Germanium (\(Ge\)) semiconductor having \(2.5 \times 10^{29}\) atoms per m3 is doped uniformly by trivalent aluminium at \(1\) ppm. If the thermally generated electron concentration at room temperature is \(n_i=10^{17}\) /m3, the resulting electron concentration after doping at the same temperature will be:
1. \(2.5 \times 10^{29}\) m-3
2. \(4 \times 10^{10}\) m-3
3. \(2.5 \times 10^{18}\) m-3
4. \(4 \times 10^{20}\) m-3
1. \(2.5 \times 10^{29}\) m-3
2. \(4 \times 10^{10}\) m-3
3. \(2.5 \times 10^{18}\) m-3
4. \(4 \times 10^{20}\) m-3
Subtopic: Â Types of Semiconductors |
 71%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
The charge on a \(\mathrm{p}\)-type semiconductor is:
1. neutral
2. negative
3. positive
4. may be positive or negative
1. neutral
2. negative
3. positive
4. may be positive or negative
Subtopic: Â Types of Semiconductors |
 72%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Pure \(Si\) at \(500\) K has equal number of electron \((n_i)\) and hole \((n_h)\) concentration of \(1.5\times10^{16}~\text{m}^{-3}.\) Doping by indium increases \(n_h\) 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 |
 69%
From NCERT
NEET - 2011
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
© 2024 GoodEd Technologies Pvt. Ltd.