MCQOPTIONS
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				| 1. | 
                                    The specially designed semi-conductor diodes used as fast counters in electronic circuits are______________? | 
                            
| A. | The light emitting diodes | 
| B. | Photo diodes | 
| C. | Photo voltaic cell | 
| D. | Solar cells. | 
| Answer» C. Photo voltaic cell | |