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Q. No.The band gap between the valence band and the conduction band in a certain material is \(3~\text{eV}.\) 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 \(hc=1240~\text{eV-nm}\) )
1. \(414~\text{nm}\)
2. \(300~\text{nm}\)
3. \(830~\text{nm}\)
4. \(207~\text{nm}\)
Subtopic: Â Energy Band theory |
 87%
Level 1: 80%+
Hints
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: Â PN junction |
Level 3: 35%-60%
Hints
The currents flowing through circuits \(A\) and \(B,\) respectively, are: (assume all diodes are ideal)
| 1. | \(1\) A, \(2\) A | 2. | \(2\) A, \(1\) A |
| 3. | \(4\) A, \(2\) A | 4. | \(2\) A, \(4\) A |
Subtopic: Â PN junction |
 86%
Level 1: 80%+
Hints
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%
Level 1: 80%+
Hints
In half-wave rectification, if the input frequency is \(60\) Hz, the output frequency will be:
| 1. | \(120\) Hz | 2. | zero |
| 3. | \(30\) Hz | 4. | \(60\) Hz |
Subtopic: Â Rectifier |
 67%
Level 2: 60%+
NEET - 2022
Hints
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
Hints
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: Â PN junction |
 78%
Level 2: 60%+
Hints
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: Â PN junction |
 53%
Level 3: 35%-60%
Hints
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: Â Rectifier |
Level 3: 35%-60%
Hints
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: Â Energy Band theory |
 79%
Level 2: 60%+
Hints
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