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Q. No.What will be the change in the current through the 5 V cell if the diode D is reversed?
1. No change
2. Increases by 0.2 A
3. Increases by 0.3 A
4. Decreases by 0.2 A
Subtopic: PN junction |
From NCERT
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Consider the circuit shown in the figure given below. The input voltage is Vi, the current through the diode is Iz, and the current through the load is IL.
| 1. | If Vi=15 V and RL=40 Ω, and Iz=0.375 A |
| 2. | If Vi=10 V and RL=5 Ω, and IL=1 A |
| 3. | If Vi=20 V and RL=20 Ω, and Iz=0.25 A |
| 4. | If Vi=20 V and RL=10 Ω, and Iz=0.5 A |
Subtopic: Applications of PN junction |
51%
From NCERT
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In the circuit shown in the diagram given below, R is a small resistor, Vi is the input voltage between A & B while Vo is the output voltage between C & D.
Consider the following two statements and mark the correct option.
Consider the following two statements and mark the correct option.
| (I) | If Vi>2 V, then Vo=Vi |
| (II) | If Vi<2 V, then Vo=2 V |
| 1. | (I) is True. |
| 2. | (II) is True. |
| 3. | (I) and (II) are both True. |
| 4. | (I) and (II) are both False. |
Subtopic: PN junction |
From NCERT
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Given below are two statements:
| Assertion (A): | The resistance of a photodiode decreases when light having photons of sufficient energy is incident on it. |
| Reason (R): | When energetic photons fall on the p-n junction of a photodiode, electron-hole pairs are created due to the breaking of the valence bonds. |
| 1. | (A) is True but (R) is False. |
| 2. | (A) is False but (R) is True. |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
Subtopic: Applications of PN junction |
73%
From NCERT
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The peak voltage in the output of a half-wave rectifier is 30 V. The RMS voltage of the output wave is: (assuming no distortion in wave)
| 1. | 30√2 V | 2. | 15 V |
| 3. | 15√2 V | 4. | 10 V |
Subtopic: Rectifier |
From NCERT
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Assume that the threshold voltage of a diode is 0.7 V, and the forward resistance is negligible.
The current through the circuit is:
1. 40 mA
2. 54 mA
3. 33 mA
4. 26 mA
The current through the circuit is:
1. 40 mA
2. 54 mA
3. 33 mA
4. 26 mA
Subtopic: PN junction |
58%
From NCERT
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A voltage VAB is applied to the left side input and the potential differences VAX and VXY are measured. Assume the diodes are ideal i.e., there is no potential difference across the diodes in forward bias. Which of the following is true?
1. If VAB>0,VAX>0
2. If VAB>0,VXY>0
3. If VAB<0,VXY>0
4. If VAB<0,VAX>0
1. If VAB>0,VAX>0
2. If VAB>0,VXY>0
3. If VAB<0,VXY>0
4. If VAB<0,VAX>0
Subtopic: PN junction |
From NCERT
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The truth table for a circuit is given by:
Here, X represents either 0 or 1. A,B, and C are the inputs. Which of the following is the correct circuit?
| A | B | C | Y (Output) |
| 1 | X | 1 | 1 |
| 0 | 1 | X | 1 |
| All other cases | 0 | ||
| 1. |  |
| 2. |  |
| 3. |  |
| 4. |  |
Subtopic: Logic gates |
53%
From NCERT
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A simple p-n junction diode follows the law: i(current)=i0eqV/kT, for large currents in forward bias.
Here, T= absolute temperature, V= voltage across the diode, k= Boltzmann's constant and i0= the drift current.
Then, the differential resistance of the diode (dVdi) is given by:
1. (constant)i
2. (constant)i2
3. constanti
4. (constant)e−βi, β-constant
Here, T= absolute temperature, V= voltage across the diode, k= Boltzmann's constant and i0= the drift current.
Then, the differential resistance of the diode (dVdi) is given by:
1. (constant)i
2. (constant)i2
3. constanti
4. (constant)e−βi, β-constant
Subtopic: PN junction |
From NCERT
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Which of the following represents a circuit that gives an output (i.e. true) when both its inputs are equal?
| 1. |  |
| 2. |  |
| 3. |  |
| 4. |  |
Subtopic: Logic gates |
57%
From NCERT
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