Can a form be password protected?

No, the word password will get your account suspended by our anti-phishing filter tool. 

Please check my demo form: https://form.jotform.com/81258648420964

It is a workaround to protect your form. Here's the condition I used to create the demo form: https://www.jotform.com/help/316-How-to-Show-or-Hide-Fields-Base-on-User-s-Answer

Please try it and let us know if you have any questions.