I'd go further to say that if you don't ask to yourself a single question while you're reading a substantial part of a book (a section, a chapter), then you don't really internalize what you think you're learning.

The questions don't need to be answered perfectly, nor they need to be "good" questions. The questions can be general and simple, like:

- Does it have to be this way? Why?

- How is it related/connected to what I've learned previously (last chapter, last year, last decade)? Do I need to unlearn something or adjust my previous mental model?