Some teachers have SMART Response or clickers in their classroom. They are technically mobile tools so I guess you can borrow them as needed. But if you are curious about gathering student responses to multiple choice questions you can also try Plickers. https://www.plickers.com/
Basically, with Plickers you print out 4 papers for each student. Each paper is different for each student so no mixing them up. Ask a question, each student holds up a card with their answer A,B,C,D. You take a picture with the iPad or phone and the answers are tabulated and sent directly to the computer.
Will it work perfectly every time? Nope. Will it be a fun way to practice for tests? I think so. Pre-testing, super idea. Student polls? Absolutely.