I tried your scenario on my side and found out the following:
- This issue is not related to IPad or other mobile devices it's related to the survey list itself.
- The default survey views
(Overview, All Response, Graphic Summary)
didn't enabled for Mobile access by default.
- There is no OOTB option to edit the current default views.
- There is no OOTB option to create a new view like other lists.
- If you tried to edit the view by any means you will not find the Mobile section to enable Mobile access as shown below

So to overcome this issue, you should create a new view with Mobile Access Enabled.
But as I above mentioned, There is no OOTB option to create a new view, so try to apply the below workaround
Open Survey list setting, the URL should look like
http://SiteURL/_layouts/15/survedit.aspx?List=%7BB6ECB328%2D7975%2D4749%2D9E90%2DFD8634CD7A10%7D
Replace survedit.aspx
with ViewNew.aspx
, the new view page should be opened.
Type your view name, and at Mobile section. make sure that you have the below options.
- Enable this view for mobile access (Applies to public views only)
- Make this view the default view for mobile access (Applies to public views only)

Browse your survey that should be now browsed on Mobile.