MCQOPTIONS
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				| 1. | 
                                    A microphone converts: | 
                            
| A. | Sound energy into mechanical energy in stereo system | 
| B. | Sound energy into electrical energy in public address system | 
| C. | Electrical energy into sound energy in ordinary telephone | 
| D. | Microwave energy into sound energy in a mobile phone | 
| Answer» C. Electrical energy into sound energy in ordinary telephone | |