This is a .pptx file with 16 questions. I use this with my clickers after Ch 28 in the Hewitt Conceptual Physics text book.
You can see 12 of the 16 questions on the FREE preview file.
The answers are in the NOTES part under each slide.
I have included each original slide that I created with PowerPoint, and also a slide of each question that is a JPEG. You can edit the original slides, the JPEGs are nice because they preserve the font & formatting and you can easily grab it to put in another file type. (for a test or your clicker software)