How to show fields based on user's selection in a drop down?

Hi. 

Question:

If I create a drop down with two choices, is it possible for the form to automatically populate one set of questions tied to one choice and an entirely different set of questions to be populated if the other choice is choosen? 

You can indeed do that with conditional logic, first add the drop down with the options, then add the group of fields you want to show per option, it's recommended to group the fields in section collapse tools so you can easily handle them. Then show each section collapse according to the selected option, this can be configured on the conditions section. Also, note that while doing this, it's not needed to select all the fields in the conditions wizard, you only need to select the collapse tool and this will automatically include the fields inside the section. 

Here's a guide with more details and steps about doing this: https://www.jotform.com/help/297-Show-or-Hide-Multiple-Fields-at-Once-Using-the-Section-Collapse-Field

If you have questions, let us know.