OK,
Thank you!
But now I can not understand the logics of answering to my questions.
I think when user select an answer (radio button) he automatically see the result of this very question. But nothing happens when I press all radio-buttons. I have to press "Save" button to see my results?

A user answer is accepted when "Save" button is pressed.

Regards,
ARI Soft

Well, OK.
But what progress bar is intended for?
As I understand it should change when radio-buttons are pressed along all questions. Isn't it?

Also,
When I go to the article with embedded quiz, it freezes showing red "loading..." message in a half cases (Google Chrome). I checked many times.

1. The progress bar is shown how many questions are completed (pressed "Save" button).

2. Is "Loading" message shown on quiz description page or during a quiz? Does it occur when a quiz is embedded into an article? What version of Google Chrome browser you use?

Regards,
ARI Soft

1. The progress bar is shown how many questions are completed (pressed "Save" button).

Yes, I see. But if all the questions are at the same page then it seems there is no need in this bar. By the way, I tried to change test pagination to "show each question on the separate page", but no effect - all questions remain on the same page.

2. Is "Loading" message shown on quiz description page or during a quiz? Does it occur when a quiz is embedded into an article? What version of Google Chrome browser you use?

I use the latest version of Google Chrome.
"Loding..." message shown on quiz description page when a quiz is embedded into an article (fulltext view). It goes further if I reload a page once again.