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Q. No.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
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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%
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 |
 77%
Level 2: 60%+
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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 |
 53%
Level 3: 35%-60%
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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: 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
To make ordinary silicon into a \(\mathrm{p\text-}\)type semiconductor, you might add to it:
| 1. | Indium | 2. | Antimony |
| 3. | Germanium | 4. | Carbon |
Subtopic: Â Types of Semiconductors |
 84%
Level 1: 80%+
Hints
In a forward-biased \(\mathrm{p\text-n}\) junction diode, the potential barrier in the depletion region is of the form of:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Â PN junction |
 63%
Level 2: 60%+
Hints
The electrical circuit used to get smooth DC output from a rectifier circuit is called:
1. logic gate
2. amplifier
3. filter
4. oscillator
1. logic gate
2. amplifier
3. filter
4. oscillator
Subtopic: Â Rectifier |
 65%
Level 2: 60%+
Hints
A full wave rectifier circuit along with the input and output voltages is shown in the figure. The contribution to the output voltage from diode-\(2\) is:
| 1. | \(A,C\) | 2. | \(B,D\) |
| 3. | \(B,C\) | 4. | \(A,D\) |
Subtopic: Â Rectifier |
 82%
Level 1: 80%+
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