An oscilloscope is basically designed to convert.

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visual signals to electrical signals

sound signals to electrical signals

electrical signals to visual signals

sound signals to visual signals

answer is C.

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Detailed Solution

Concept: Let us discuss what an oscilloscope is.
An oscilloscope (also known as scopes) is used to test and display varying voltage signals as waveforms, visual representations of the variation of voltage with respect to time. The oscilloscope basically shows the signals in the form of graphs which show how the signal is changing.
There are various types of oscilloscopes such as analogue and digital. Earlier analogue oscilloscopes were used but as the technology became advanced in the field of electronics, digital oscilloscopes replaced the older ones.
Normally most oscilloscopes are easy to use and it helps to have an understanding of how these items of electronics theories and experiments work and instruments operate. Mostly soft keys are present on the screen, so there is a lot that can be done.
The main function of an oscilloscope is to display waveforms on some form of display like graphs. In these graphs, normally, the time is displayed along the horizontal axis (X-axis) and amplitude is displayed along the vertical axis (Y-axis) . This makes it possible to easily study the waveforms and draw a conclusion.
Therefore, an oscilloscope is basically designed to convert electrical signals to visual signals.
Hence, the correct option is 3.

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