Google Docs, in addition to creating documents and spreadsheets, allows you to create "forms" that can then be embedded in other programs, such as Blogger or Wikispaces. A form can be a survey, quiz, or poll. It is simply a way to gather information. Because of the nature of the form, it is not very secure. Your students won't be stopped from voting more than once, putting someone else's name in, or other mischievous actions.
From your Google Docs homepage, click the "Create New" and select "Form". Create the survey/quiz/poll as desired. To add another question, there is a button in the left top corner of the page with a green plus sign "Add item".
When you are done with your form, you will need to get the "embed" code to place the form into your blog or wiki. Click the button titled "More Actions" and select "Embed". You will need to copy the code in the box by highlighting it and right clicking and selecting "copy".
If you would like to place this form in a blog, simply go to a new post and paste the embed code. If you would like to place the form in a wiki, you must add the code as the "Other HTML" widget. Just paste the embed code in the box that comes up when you select the correct widget.
If you want to edit your form after you've embedded it, but before people have started taking it, you must go back to the Google Docs form page and click the "Form" tab on the blue strip near the top of the page. You will have to go back through the embed steps and replace the revised in your blog or wiki.