One of the requirements we have been facing from our customers was to have an easy way of creating simple, easy, publically accessible surveys on top of SharePoint. With the SharePoint 2013 and it's integrated Excel Services this has become very easy.
In the below example I am using the pre-configured environment of SharePoint 2013 - Office 365.
Go to Sky Drive click on New Document and further Click on Excel Survey (see the image below)
This will automatically create an Excel and will Open a Wizard to create a Survey.
Enter the Questions, set their Properties, Save & Share the Survey.