How do I create a questionnaire that provides an automatic response based on certain answers

want to create a questionnaire that provides automated responses which vary depending on answer.  how do I do this please?

You need to create the autoresponder email then set up a conditional logic to send the emails based on the answer. Here's our general guide for that: https://www.jotform.com/help/167-How-to-send-to-a-specific-email-address-based-on-a-selection. 

To create an autoresponder email, https://www.jotform.com/help/26-Creating-a-Form-Autoresponder.