Clock App

Hi har.smith,
I understand that you are having an issue with the alarm sounds on your iPad. Let's see if we can figure out what is going on.
Now if you have the sounds off, is the volume turned up for any audio playback? This could be the reason you are not hearing anything when an alarm goes off. Take a look at the setting in Control Center to ensure you have the volume at an appropriate level. The articles below will have more information on Control Center and what to do with no audio issues on your iPad.
Use Control Center on your iPhone, iPad, and iPod touch
https://support.apple.com/en-us/HT202769
If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker
https://support.apple.com/en-us/HT203794​
Have a good day

Hello har.smith,
If all the settings look correct then your next step would be to back up and then restore your iPad. You might want to restart it and set it up as new. This would require you to sync your content back on manually. Take a look at the article below for more details.
How to erase your iOS device and then set it up as a new device or restore it from backups
https://support.apple.com/en-us/HT204686
Take care