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Q. No.The band gap between the valence band and the conduction band in a certain material is \(3\) eV. What is the longest wavelength of light that can create an electron-hole pair in the material, with the electron in the conduction band and the hole in the valence band? (Take \(hc\)=\(1240\) eV-nm.)
1.
\(414\) nm
2.
\(300\) nm
3.
\(830\) nm
4.
\(207\) nm
Subtopic: Energy Band theory |
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The current-voltage characteristic of an ideal \(\mathrm{p \text{-}n}\) junction diode is given by the graph as shown in the following figure:
This diode is connected with a resistance of \(5~\Omega\) in series with it as shown below:
Which of the following shows the dependence of the voltage \(V_{AB}\) and the current \(i\), when the diode is forward-biased? (\(V_{AB}\) in volt, \(i\) in ampere)
This diode is connected with a resistance of \(5~\Omega\) in series with it as shown below:
Which of the following shows the dependence of the voltage \(V_{AB}\) and the current \(i\), when the diode is forward-biased? (\(V_{AB}\) in volt, \(i\) in ampere)
| 1. | \(V_{A B}=i\cdot5+0.6\) |
| 2. | \(V_{A B}=i\cdot5-0.6\) |
| 3. | \(V_{A B}=i\cdot5+(0.6-5)\) |
| 4. | \(V_{A B}=i\cdot5+\left(0.6+5\right)\) |
Subtopic: PN junction |
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Currents flowing in each of the circuits A and B respectively are:
(All the diodes are ideal)
1. \(1\) A, \(2\) A
2. \(2\) A, \(1\) A
3. \(4\) A, \(2\) A
4. \(2\) A, \(4\) A
(All the diodes are ideal)
1. \(1\) A, \(2\) A
2. \(2\) A, \(1\) A
3. \(4\) A, \(2\) A
4. \(2\) A, \(4\) A
Subtopic: PN junction |
88%
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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: Types of Semiconductors |
89%
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In half-wave rectification, if the input frequency is \(60\) Hz, then the output frequency would be:
1. \(120\) Hz
2. zero
3. \(30\) Hz
4. \(60\) Hz
1. \(120\) Hz
2. zero
3. \(30\) Hz
4. \(60\) Hz
Subtopic: Rectifier |
64%
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NEET - 2022
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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: Energy Band theory |
73%
From NCERT
NEET - 2022
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Given below are two statements:
| Assertion (A): | Thickness of depletion layer is fixed in all semiconductor devices. |
| Reason (R): | No free-charge carriers are available in the depletion layer. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Subtopic: PN junction |
71%
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In the circuit shown in the figure, \(V_A>V_B.\) Which of the diodes conduct?
| 1. | only \(D_3\) |
| 2. | \(D_1\) and \(D_3\) |
| 3. | all of the diodes |
| 4. | none of the diodes |
Subtopic: PN junction |
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Which circuit element would make the best series filter to prevent high–frequency signals from passing through a bass speaker?
1. a capacitor
2. an inductor
3. a resistor
4. a transformer
1. a capacitor
2. an inductor
3. a resistor
4. a transformer
Subtopic: Rectifier |
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Specify which of the following type of material might satisfy these descriptions:
A half-filled valence band, an empty conduction band, and an energy gap of \(1\) eV.
A half-filled valence band, an empty conduction band, and an energy gap of \(1\) eV.
| 1. | conductor |
| 2. | insulator |
| 3. | semiconductor |
| 4. | none of the above |
Subtopic: Energy Band theory |
78%
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