Uh, how can you even answer the questions, if you don’t read the book?
Are you just going to make blind guesses?
It’s gonna show in your answers or if teacher decides to surprise you with a quiz or test later. You won’t be able to look up answers in Cliff Notes or the Internet then! 
But if you are simply are looking for an answer to is it sinful to not do everything the teacher asks? Then no it isn’t. But I again stress it’s a very dumb (and quite immature) thing to do. 
You might actually enjoy reading the book and thinking about what you read. Just answering the questions will not give you as rich an experience. It’s the easy short-cut method that often doesn’t work effectively and is ultimately less rewarding mentally and emotionally.
We just had an honor code presentation at our kid’s junior/senior high school, and they specifically mentioned watching a movie or using Cliff notes as a violation of the honor code.
Interesting.
I wonder why? The kid is likely to fail before long by not doing the assigned work. As long as there’s no lying, cheating or plagiarism I wouldn’t see this as an honor issue. I may be in the minority, but school shouldn’t be forced. Then it becomes a mandatory juvenile prison. 
. They don’t do the work, then they fail and will eventually screw up their lives. Simple consequences for simple problems.I was perplexed by that school’s banning of movies and study guides too, which sounds like book banning to me. It’s outside of the school’s authority to tell parents what their children can or cannot read or watch outside of school.Interesting.
b t w, my usual reading style is to start at the back or middle of a book, fasten on the middle of a page, let my eyes spiral outwards, when I am fed up with that page I find another page, etc. Not recommended to be copied if you can find a better way and I only discovered I was doing it in late middle age. I am admitting it in case someone else thinks they are the only one! Often I work my way systematically through afterwards to fill in any gaps!