At the end of a job interview, you will be asked if you have any questions. Irrespective of how much you know about the company, it is good practice to ask a couple of questions.
Asking boring questions at the end of a job interview will not help. Questions like How much is the holiday allowance? is a useless question to ask.
Instead ask these smart questions at the end of a job interview. To read all the questions and why they are important see this amazing article by CareerContessa.com
I have condensed the smart questions to ask at the end of a job interview into a small infographic.