Which of the following is NOT an audio aid?

Audio aids refer to tools or devices that help deliver information through sound, facilitating better understanding, learning, or communication.

Key PointsTypes of Audio Aid:

• Gramophone is an audio device used to play recorded sound, particularly music or voice recordings, making it an audio aid.
• Tape Recorder is a device that plays and records sound, making it another example of an audio aid.
• Radio is an audio device that transmits sound through airwaves, making it a clear example of an audio aid.

Hint

• Epidiascope is not an audio aid. It is a visual aid used to project images, text, or documents onto a screen.
• While it might be used to display visual content like diagrams or pages from books, it does not produce sound. Therefore, it does not belong to the category of audio aids.

Hence, Epidiascope is not an audio aid because it primarily functions as a visual tool.