While creating your experiment you can add in survey questions using the Question element.
There are different question types for you to use:
Multiple Choice: You are able to type in multiple possible responses, and you can allow the respondents to select one or multiple answers. You can also randomize the available choices.
Text Box: Respondents will have a text box to type in their responses. The size of the text box can be adjusted.
Matrix: You are able to create a question table with columns and rows, both of which can be randomized. You can also enable single or multiple responses for respondents.