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Q. No.An electric field is applied to a semiconductor. Let the number of charge carriers be \(n\) and the average drift speed be \(v.\) If the temperature is increased, then:
1.
both \(n\) and \(v\) will increase.
2.
\(n\) will increase but \(v\) will decrease.
3.
\(v\) will increase but \(n\) will decrease.
4.
both \(n\) and \(v\) will decrease.
Subtopic: Â Types of Semiconductors |
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Let \(n_{p}\) and \(n_{e}\) be the number of holes and conduction electrons in an intrinsic semiconductor. Then:
1. \(n_{p}> n_{e}\)
2. \(n_{p}= n_{e}\)
3. \(n_{p}< n_{e}\)
4. \(n_{p}\neq n_{e}\)
Subtopic: Â Types of Semiconductors |
 85%
From NCERT
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In a semiconductor;
| (A) | there are no free electrons at \(0^\circ\text{K}.\) |
| (B) | there are no free electrons at any temperature. |
| (C) | the number of free electrons increases with temperature. |
| (D) | the number of free electrons is less than that in a conductor. |
Choose the correct option from the given ones:
| 1. | (A) and (B) only |
| 2. | (B) and (C) only |
| 3. | (A), (C), and (D) only |
| 4. | (A), (B), and (D) only |
Subtopic: Â Energy Band theory |
 87%
From NCERT
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The peak voltage in the output of a half-wave rectifier is \(30 ~\text{V}.\) The RMS voltage of the output wave is: (assuming no distortion in wave)
| 1. | \(\dfrac{30}{\sqrt2}~\text{V}\) | 2. | \(15 ~\text{V}\) |
| 3. | \(\dfrac{15}{\sqrt2}~\text{V}\) | 4. | \(10 ~\text{V}\) |
Subtopic: Â Rectifier |
From NCERT
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The dominant contribution to current comes from holes in the case of:
| 1. | metals |
| 2. | intrinsic semiconductors |
| 3. | \(\mathrm{p} \text-\)type extrinsic semiconductors |
| 4. | \(\mathrm{n} \text-\)type extrinsic semiconductors |
Subtopic: Â Types of Semiconductors |
 91%
From NCERT
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A junction diode exhibits a resistance of \(25~ \Omega\) in the forward-biased condition and \(25000 ~\Omega\) in the reverse-biased condition. Based on the given circuit configuration, what will be the current flowing through the diode?
| 1. | \(\dfrac{1}{7}\) A | 2. | \(\dfrac{1}{6}\) A |
| 3. | \(\dfrac{1}{25}\) A | 4. | \(\dfrac{1}{180}\) A |
Subtopic: Â PN junction |
 87%
From NCERT
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The resistance between \(A\) and \(B\) is
| 1. | \(100~\Omega\) if \(V_A>V_B\) and \(200~\Omega\) if \(V_A<V_B\) |
| 2. | \(100~\Omega\) if \(V_A<V_B\) and \(200~\Omega\) if \(V_A>V_B\) |
| 3. | \(100~\Omega\) |
| 4. | \(200~\Omega\) |
Subtopic: Â PN junction |
 75%
From NCERT
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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 |
 68%
From NCERT
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: Â Energy Band theory |
 75%
From NCERT
NEET - 2022
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The truth table for the given logic circuit is:
| 1. |
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| 2. |
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| 3. |
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| 4. |
|
Subtopic: Â Logic gates |
 61%
From NCERT
NEET - 2022
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