- 1(current)
Q. No.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: Â Applications of PN junction |
 72%
Level 2: 60%+
Hints
Zener diode is not used for:
| 1. | oscillatory circuit | 2. | current amplification |
| 3. | voltage amplification | 4. | all of the above |
Subtopic: Â Applications of PN junction |
 69%
Level 2: 60%+
Hints
For a Zener diode used as a voltage regulator, the connections are as follows:
Choose the correct option from the options given below:
| (I) | In forward bias |
| (II) | In reverse bias |
| (III) | In parallel with the load |
| (IV) | In series with the load |
Choose the correct option from the options given below:
| 1. | (I) and (II) only |
| 2. | (II) and (III) only |
| 3. | only (I) |
| 4. | only (IV) |
Subtopic: Â Applications of PN junction |
 87%
Level 1: 80%+
Hints
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 \(\mathrm{p\text{-}n}\) 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: Â Applications of PN junction |
 73%
Level 2: 60%+
Hints
- 1(current)
Q. No.
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