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Q. No.The cut-off voltage of the diodes (shown in the figure) in forward bias is \(0.6~\text{V}\). The current through the resister of \(40~ \Omega\) is:
1. \(2~\text{mA}\)
2. \(4~\text{mA}\)
3. \(6~\text{mA}\)
4. \(8~\text{mA}\)
Subtopic: Â PN junction |
 78%
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Which doping element is used to make an \(\mathrm{n\text-}\)type semiconductor?
| 1. | Boron | 2. | Phosphorous |
| 3. | Aluminium | 4. | Gallium |
Subtopic: Â Types of Semiconductors |
 85%
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The incorrect statement about the property of a Zener diode is:
| 1. | Zener voltage remains constant at the breakdown. |
| 2. | It is designed to operate under reverse bias. |
| 3. | The depletion region formed is very wide. |
| 4. | \(\mathrm{p}\) and \(\mathrm{n}\) regions of the Zener diode are heavily doped. |
Subtopic: Â Applications of PN junction |
 57%
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NEET - 2022
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The electrical conductivity of a semiconductor increases when electromagnetic radiation with a wavelength shorter than \(2400~\text{nm}\) is incident on it. The band gap of the semiconductor (in eV) is: \((h=6.63\times10^{-34}~\text{J-s})\)
| 1. | \(0.33\) eV | 2. | \(0.80\) eV |
| 3. | \(0.52\) eV | 4. | \(0.10\) eV |
Subtopic: Â Energy Band theory |
 77%
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A piece of iron and a piece of germanium are cooled from the \(400~\text{K}\) temperature down to \(77~\text{K}\).
Then:
Then:
| 1. | the resistance of each of them increases |
| 2. | the resistance of each of them decreases |
| 3. | the resistance of iron increases and that of germanium decreases |
| 4. | the resistance of iron decreases and that of germanium increases |
Subtopic: Â Types of Semiconductors |
 75%
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A potential barrier of \(0.4~\text{V}\) exists across a p-n junction. An electron enters the junction from the n-side with a speed of \(6.0\times10^{5}~\text{ms}^{-1}\). The speed with which the electron enters the p-side will be \(\frac{\mathrm{x}}{3} \times 10^{5} \mathrm{~ms}^{-1}\) The value of \(\mathrm{x}\) is:
(Given the mass of electron = \(9\times 10^{-31}~\text{kg}\), charge on electron = \(1.6\times 10^{-19}~\text{C}\).)
1. \(10\)
2. \(12\)
3. \(14\)
4. \(16\)
(Given the mass of electron = \(9\times 10^{-31}~\text{kg}\), charge on electron = \(1.6\times 10^{-19}~\text{C}\).)
1. \(10\)
2. \(12\)
3. \(14\)
4. \(16\)
Subtopic: Â PN junction |
 58%
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Two ideal diodes are connected in the network as shown in the figure. The equivalent resistance between \(A\) and \(B\) is:
1. \(15~\Omega\)
2. \(25~\Omega\)
3. \(35~\Omega\)
4. \(45~\Omega\)
1. \(15~\Omega\)
2. \(25~\Omega\)
3. \(35~\Omega\)
4. \(45~\Omega\)
Subtopic: Â PN junction |
From NCERT
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Given below are two statements:
| Assertion (A): | The temperature coefficient of resistance is positive for metals and negative for \(\mathrm{p\text-}\)type semiconductors. |
| Reason (R): | The effective charge carriers in metals are negatively charged whereas in \(\mathrm{p\text-}\)type semiconductors, they are positively charged. |
| 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. | Both (A) and (R) are False. |
Subtopic: Â Energy Band theory |
 55%
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The diode used in the circuit shown in the figure has a constant voltage drop of \(0.5\) V at all currents and a maximum power rating of \(100~\text{mW.}\) What should be the value of the resistor \(R,\) connected in series with the diode for obtaining maximum current?
| 1. | \(1.5~\Omega\) | 2. | \(5~\Omega\) |
| 3. | \(6.67~\Omega\) | 4. | \(200~\Omega\) |
Subtopic: Â PN junction |
 67%
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Given below are two statements:
| Assertion (A): | The value of current through \(\mathrm{p\text-n}\) junction in the given figure will be \(10~\text{mA}.\) |
| Reason (R): | In the above figure, \(\mathrm{p\text-}\)side is at a higher potential than \(\mathrm{n\text-}\)side. |
| 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. | Both (A) and (R) are False. |
Subtopic: Â PN junction |
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