If you would like to add audio to a Google Form (or documents, emails, presentations) try using the extension Mote. In this example we will be adding audio to a Google Form (new release).
Once you add the extension and go through the sign-up process make sure you open up a Google Form.
When you open up the form you will see the Mote icon built into your form.
Now, when you add the specific audio you would like to add, you will notice it does not come directly into the form itself. You will need to enter back into the extension and choose My recent motes and select the share icon.
Once you select the share icon you can then copy the link and paste it next to where you would like it to appear. You will see the link and when you preview the form you will see the ability to play the audio.
Embedded below is a 2 minute and 21 second YouTube tutorial.