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Q. No.When a \(p\)-type semi-conductor is put in an electric field \(\overrightarrow E\) the electrons in the valence band, on average,
1.
flow in the direction of the \(\overrightarrow E\) and cause a current opposite to \(\overrightarrow E\)
2.
flow opposite to \(\overrightarrow E\) and cause a current along \(\overrightarrow E\)
3.
flow along \(\overrightarrow E\) and cause a current along \(\overrightarrow E\)
4.
flow opposite to \(\overrightarrow E\) and cause a current opposite to \(\overrightarrow E\)
Subtopic: Â Types of Semiconductors |
 68%
From NCERT
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In an unbiased \(\mathrm{p\text{-}n}\) junction, holes diffuse from the \(\mathrm{p\text{-}}\)regions to \(\mathrm{n\text{-}}\)regions because of:
| 1. | the attraction of free electrons of the \(\mathrm{n\text{-}}\)region. |
| 2. | the higher hole concentration in the \(\mathrm{p\text{-}}\)region than that in the \(\mathrm{n\text{-}}\)region. |
| 3. | the higher concentration of electrons is in the \(\mathrm{p\text{-}}\)region than that in the \(\mathrm{n\text{-}}\)region. |
| 4. | the potential difference across the \(\mathrm{p\text{-}n}\) junction. |
Subtopic: Â PN junction |
 67%
From NCERT
NEET - 2013
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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: Â PN junction |
 52%
From NCERT
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In the given circuits (a), (b) and (c), the potential drop across the two \({\mathrm{p\text-n}}\) junctions are equal in:
| 1. | both circuits (a) and (c) |
| 2. | circuit (a) only |
| 3. | circuit (b) only |
| 4. | circuit (c) only |
Subtopic: Â PN junction |
 65%
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 |
 73%
From NCERT
NEET - 2022
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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: Â Rectifier |
 64%
From NCERT
NEET - 2022
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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 |
 77%
From NCERT
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The circuit shown in figure is given an input signal \(V_i,\) which varies with time and the corresponding output is \(V_o.\) Then,
| 1. | \(V_o=V_i+E\) |
| 2. | \(V_o=V_i-E\) |
| 3. | \(V_o=V_i,\) only when \(V_i>E\) |
| 4. | \(V_o=V_i,\) only when \(V_i<E\) |
Subtopic: Â PN junction |
From NCERT
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The voltage \(V_{AB}=20~V\) at its peak value, and is sinusoidal in time. The current \(i\) (in amperes), when plotted as a function of time, is given by:
(Consider the diodes as ideal.)
(Consider the diodes as ideal.)
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Â PN junction |
From NCERT
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A full wave rectifier circuit consists of two \(\mathrm{p\text-n}\) junction diodes, a centre-tapped transformer, capacitor and a load resistance. Which of these components remove the ac ripple from the rectified output?
| 1. | load resistance | 2. | a centre-tapped transformer |
| 3. | \(\mathrm{p\text-n}\) junction diodes | 4. | capacitor |
Subtopic: Â Rectifier |
 52%
From NCERT
NEET - 2023
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