Silpion

This plugin gives a possibility to manage Frequently Asked Questions as a custom post type. Site admin is able to add and edit questions and answers, assign them to categories and then display the output on any page using [faq] or [faq category={{category_id}}] on any WordPress page.
You can embeed the FAQ directly in your code using lcb_faq_display() function.

LCB FAQ

Displays questions with answers with FAQ category column.

kuryk

Stranger Questions – FAQ
Stranger Questions – FAQ is a free WordPress plugin. The plugin is very user-friendly and easy to use. It will help you add a frequently asked questions block. 
You can also add an image to the answer to the question. And you can use the basket for questions. A block of questions can be taken out in a convenient place with the help of a shortcode. I hope this plugin is useful to you and use this plugin.
<h3>Plugin features</h3>
<ul>
<li>Add a block of frequently asked questions.</li>
<li>Adding an image to an answer.</li>
<li>Output using shortcode.</li>
<li>Delete questions in the basket.</li>
</ul>

Stranger Questions – FAQ

Stranger Questions - FAQ is a convenient plug-in for use. Now, this plugin will help you add a frequently asked questions block.

LCB FAQ vs Stranger Questions – FAQ