It is always a good practice to ask the candidate at the end of the interview if they have any questions. A candidate who has researched your organization and thought about the job and what further opportunities this may bring will likely have questions burning inside them! An insightful question from the candidate indicates they have given thought to how the job may suit them.
This is your final opportunity to observe the candidate:
Do they show enthusiasm?
Are they excited at the opportunity or faintly bored?
How do you rate their questions?
Some candidates may find the interview very tiring and will just want to get away as quickly as possible. A candidate who is still showing the right attitude and is fired up, eager to know more, and shows signs of wanting to work with you will stand out from the crowd.