1. | forward biased zener diode. |
2. | type of light-emitting diode. |
3. | diode working on the principle of photo-voltaic effect. |
4. | type of photo-diode with external biasing. |
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1. | C, B, D | 2. | A, D, E |
3. | C, D, E | 4. | A, B, C |