Is there a way to limit the number of responses allowed per form or question?

Is there a way to limit the number of responses allowed per form or question?

Yes there is, please check the following guide:

1) Setup unique submissions in your form per browsers cache, or IP address: https://www.jotform.com/help/64-How-to-Set-Unique-Submissions-on-a-Form 

2) Limit the total allowed submissions in a form: https://www.jotform.com/help/137-How-to-Limit-Submissions-in-a-Form 

3) Limit submissions based on a unique question: https://www.jotform.com/help/223-How-to-set-Form-Limits-Based-on-a-Unique-Question 

Let us know if you have more questions on this, or open a new thread if you need anything else, we will be glad to assist you.