What you ask is important but so is what you observe. Look at the work on the walls - is a full range of abilities evident? Does the head teacher know the children and speak to them as they go past?
Are teachers polite and welcoming or do they make you feel like pupils. If your child is with you, how do they speak to him/her? You can read Ofsted reports all you like but your own gut feelings are very important.
When is homework introduced? How long are children expected to work at home? (Some parents demand it, some do not approve of it for the younger end of the primary school). What reading scheme is used and how is reading taught?
Ask teachers if they would send their children to the school (don't expect a straight answer but observe the body language). Ask how long members of staff have been at the school - high turnover is a red flag.
When you visit can you see all over the school or are you excluded from parts of it?
How much physical activity is there?
What input does the PTA have. Are there social/fundraising events?
Ask for details of the bullying policy. If you are told there is no bullying this is a red flag. There is always some but what matters is how it is dealt with
Google to find out if there have been any adverse articles about the school in the local press.
Ask shopkeepers local to the school for their impressions.
Do pupils appear lively and happy on the whole?
Hope at least some of this is helpful.