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Q. No.For the logic circuit given below, the output \(Y\) for \(A=0,B=0\) and \(A=1,B=1\) are:
1. \(0\) and \(1\)
2. \(0\) and \(0\)
3. \(1\) and \(0\)
4. \(1\) and \(1\)
1. \(0\) and \(1\)
2. \(0\) and \(0\)
3. \(1\) and \(0\)
4. \(1\) and \(1\)
Subtopic: Logic gates |
81%
Level 1: 80%+
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A photocell is illuminated by a point source of radiation \(4\) m away. If the same source is kept \(8\) m away, then the number of photoelectrons emitted:
| 1. | becomes four times the initial value. |
| 2. | becomes one-fourth of the initial value. |
| 3. | remains unchanged. |
| 4. | becomes half of the initial value. |
Subtopic: Applications of PN junction |
68%
Level 2: 60%+
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A Zener diode is used to obtain a constant voltage. If the applied voltage \(V\) changes, then:
(\( V\) is more than Zener voltage)
| 1. | \(i_{1}\) and \(i_{2}\) change. |
| 2. | \(i_{2}\) and \( V_{0}\) change and \(i_{3}\) remain constant. |
| 3. | \(i_{2}\) and \(V_{0}\) don't change while \(i_{3}\) changes. |
| 4. | \(i_{3}\) and \( V_{0}\) don't change while \(i_{2}\) changes. |
Subtopic: Applications of PN junction |
65%
Level 2: 60%+
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Subtopic: Logic gates |
81%
Level 1: 80%+
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Which of the following-junction is used unbiased?
1. Photo diode
2. LED
3. Zener diode
4. Solar cell
Subtopic: Applications of PN junction |
75%
Level 2: 60%+
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In the given circuit, the power developed in the \(2~\text{k}\Omega\) resistor is:
1. \(36~\text{mW}\)
2. \(12~\text{mW}\)
3. \(144~\text{mW}\)
4. \(72~\text{mW}\)
Subtopic: Applications of PN junction |
75%
Level 2: 60%+
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Current \(I_1\) through the Zener diode shown in the circuit is:
1. Zero
2. \(0.6\) mA
3. \(0.2\) mA
4. \(0.8\) mA
Subtopic: Applications of PN junction |
62%
Level 2: 60%+
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The output of the OR gate is \(1\):
| 1. | only if both inputs are zero. |
| 2. | if either or both inputs are \(1\). |
| 3. | only if both inputs are \(1\). |
| 4. | if any of the inputs is zero. |
Subtopic: Logic gates |
88%
Level 1: 80%+
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In the circuit shown, \(I_1~\text{and}~I_2\) are respectively:
(If diodes are ideal)
(If diodes are ideal)
| 1. | \(0,0\) | 2. | \(5~\text{mA},5~\text{mA}\) |
| 3. | \(5~\text{mA},0\) | 4. | \(0,5~\text{mA}\) |
Subtopic: PN junction |
54%
Level 3: 35%-60%
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The LED:
| 1. | is reverse-biased. |
| 2. | is forward-biased. |
| 3. | can be made of \(\mathrm{GaAs}.\) |
| 4. | both (2) and (3) are correct. |
Subtopic: Applications of PN junction |
72%
Level 2: 60%+
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