1. Normally i want to convert electrical signal into audio signal.
2. By using Microphone i can able to see the electrical signal in Oscilloscope. But I can't able to see the audio signal in Oscilloscope
3. Is any method to see the Audio signal in Oscilloscope

 

Oscilloscopes can only see electrical signals. That's what they do. You must first convert any signal to an electrical signal in order to see it on an oscilloscope. A microphone converts air pressure changes to electrical signals. A photodiode converts light changes to electrical signals. And so on.

What is the nature of the audio signal you want to see on the oscilloscope?

 

The audio signal may be too small compared to the "electrical" signal - the DC bias.
Put a 1 nF capacitor in series with your oscilloscope probe (or select AC input) and reduce the scope vertical display range.

 

By using Microphone i can able to see the electrical signal in Oscilloscope. But I can't able to see the audio signal in Oscilloscope

What is the nature of the electrical signal you see?
What do you expect to see for the audio signal?