This is an activity that will take 15-20 for students.
Students receive a 1 page handout. In the left hand column is the reading assignment. In the right hand column are the questions. As students read, they will answer the questions in the right hand column. Answers can be found near the question. If a student passes a question and hasn't found the answer, they will know go re-read the passage.
Once a student has completed the page, they will obtain a copy of the answer key (included) from the front of the room to do a "self check".
This is a short and simple way to either pass on information to students or check for understanding as the sheet can be easily collected and graded. I choose to use them as either an introduction or follow up to a short lecture in class or sometimes a homework assignment where students will do their "self check" as their do-now activity when they enter class.