I am creating my CV on an A4 and I am wondering whether a 10 point font size is big enough. here is screenshot and I am talking about the content next to the crosses: http://d.pr/i/LDKK.
in fact do e really need to have that kind of description in there?
Most textbooks will use 10 to 12pt type. 10pt type is generally readable provided the font is well designed and line spacing is appropriate.
(Personal opinion: That san serif text is horrible. Letter spacing is horrendous and it is not a very "readable" typeface to use at a small size. Is that Arial? Arial is a horrid typeface.)
10 point can be perfectly readable, but make sure you validate your design choices by printing your CV. Test on both an inkjet and a laser printer is possible. The kind of printer you're using (inkjet vs laser) can have a big impact on how well smaller type sizes are rendered.
I realize that a printed CV is used less frequently these days, but printing is a great way to get a sense of your overall design. Also, the person you send your CV to might choose to print it out.