Saw this in "Basic Conversational Russian" by Fairbanks and Leed the other day, then was reminded about it when I saw the posts about stress. The book has this to say about questions without an interrogative word.
---------_____/
______/
Is she a teacher?

The pitch of the voice begins on mid pitch, jumps to high on the primary stress, and at the end of the sentence there is a slight rise.

In Russian there are several contours that may occur with such questions, the most important of which is the following:


_______/ \
-------------\__________
Вам понравился Кремль?

The sentence begins on mid pitch and jumps to extra high pitch on the primary stress, thereafter falling to low pitch. Since this question contour is rather similar to a type of statement contour in English, it is a type that an American may interpret as a statement rather than as a question. Therefore, the student should listen to this contour carefully and practice imitating it if he is to avoid misinterpreting Russian questions or being misinterpreted.
something to think about...