Itamar Tzadok

Students can also be advised to make sure their browser's character encoding is set to utf-8.

I don't have 1.9 yet but after skimming through Moodle docs it seems that what you are looking for is in what is called Grage Item

Yes, and this workaround will hopefully become redundant soon with the addition of theme editor.

You can enclose a label you want anchored with <a name="xxx">...</a> (in the 'Toggle HTML Source' mode) and then add a hyperlink in your contents section such that the url is set to #xxx.

Does it happen? Because it shouldn't. For each question if the mark is negative it should become zero, and so the total grade of all incorrect answers should be zero.