To define a minimum or maximum character count for a text response:
- Set the question type to Paragraph.
- Open the data validation menu (two dots in lower right corner).
- Choose Min or Max character count, enter the desired number.
- Enter custom error text as desired.
To force a specific number of multiple select choices:
To limit grid response to one per column:
To force email or URL as a text response:
- Set the question type is Checkboxes.
- Open the data validation menu (two dots in lower right corner).
- Choose at least, at most, or exactly.
- Set number of checkboxes.
- Enter custom error text as desired.
To limit grid response to one per column:
- Let the question type is Multiple choice grid.
- Open the data validation menu (two dots in lower right corner).
- Choose Limit to one response per column.
To force email or URL as a text response:
- Set the question type is Short answer.
- Open the data validation menu (two dots in lower right corner).
- Select Email address or URL.
- Enter custom error text as desired.