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    science
    Grade-4-
    Easy

    Question

    A device that changes electrical energy to sound energy is

    1. A microphone    
    2. An alarm    
    3. A speaker    
    4. Both b and c    

    hintHint:

    A device that changes electrical energy to sound energy is speaker and alarm.

    The correct answer is: Both b and c

      •  Device like speakers works on electricity.
      • When turned on, this electrical energy moves the diaphragm.
      • This finally produces sound energy and we can hear the sound waves.

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