The iQ is structured as a numerical or non caps-sensitive short answer with a maximum of 500 characters allowed per response.
This means you can ask students to respond with a number, a letter, a word , a sentence or a short paragraph.
If you would like the answers to be self correcting then you must ask questions that have a very well defined answer. For more complex questions this might require preparation of multiple choice or true/false questions that can be displayed on the board allowing students to input a simple letter answer.