- 1(current)
Q. No.In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is a/an:
| 1. | p-type semiconductor |
| 2. | insulator |
| 3. | metal |
| 4. | n-type semiconductor |
Subtopic: Energy Band theory |
74%
From NCERT
AIPMT - 2007
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh
Identify the incorrect statement from the following:
| 1. | The resistivity of a semiconductor increases with an increase in temperature. |
| 2. | Substances with an energy gap of the order of 10 eV are insulators. |
| 3. | In conductors, the valence and conduction bands may overlap. |
| 4. | The conductivity of a semiconductor increases with an increase in temperature. |
Subtopic: Energy Band theory |
78%
From NCERT
AIPMT - 2005
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints
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NEET 2023 - Target Batch - Aryan Raj Singh
Carbon, Silicon, and Germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy gaps represented by \(\left(E_g\right)_C,(E_g)_{Si}~\text{and}~(E_g)_{Ge}\) respectively. Which one of the following relationships is true in their case?
| 1. | \(\left(E_g\right)_C<\left(E_g\right)_{G e} \) | 2. | \(\left(E_g\right)_C>\left(E_g\right)_{S i} \) |
| 3. | \(\left(E_g\right)_C=\left(E_g\right)_{S i} \) | 4. | \(\left(E_g\right)_C<\left(E_g\right)_{S i}\) |
Subtopic: Energy Band theory |
70%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh
A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength:
1. 6000 Å
2. 4000 nm
3. 6000 nm
4. 4000 Å
Subtopic: Energy Band theory |
63%
From NCERT
AIPMT - 2009
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh
\({C}\) and \({Si}\) both have the same lattice structure, having \(4\) bonding electrons in each. However, \(C\) is an insulator whereas \(Si\) is an intrinsic semiconductor. This is because:
| 1. | in the case of \(C\), the valence band is not completely filled at absolute zero temperature. |
| 2. | in the case of \(C\), the conduction band is partly filled even at absolute zero temperature. |
| 3. | the four bonding electrons in the case of \(C\) lie in the second orbit, whereas in the case of \(Si\), they lie in the third. |
| 4. | the four bonding electrons in the case of \(C\) lie in the third orbit, whereas for \(Si\), they lie in the fourth orbit. |
Subtopic: Energy Band theory |
71%
From NCERT
NEET - 2012
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints
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NEET 2023 - Target Batch - Aryan Raj Singh
- 1(current)
Q. No.
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