ALthough I'm able to set an alarm and chose a sound, no sound is emitted. I seam to remember removing it sometime ago, but can't remember how I did it and now would like to re-activate the sound.
You stated this in a response above.
"Actually it was interesting to learn about this action, but unfortunately, this did not help as the sound on the task bar is already at its maximum."
I have no clue as to what you know and don't know so I am merely trying to cover all bases.
There is nothing on your Mac that you can do to enable the sound on the iPad except to restore the iOS software.
I have two more suggestions.
Did you check Settings>Sounds>Ringers and Alerts>Change with Buttons to see how you have that set? If you have it set to "Off" and that volume slider is all the way to the left, that will turn the sound all the way down on those sounds.
The other suggestion is to reboot the iPad.
Reboot the iPad by holding down on the sleep and home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider if it appears on the screen - let go of the buttons. Let the iPad start up.