Specify the following queries in MySQL:

$1.$ Retrieve the names of all employees in department $5$ who work more than $10$ hours per week on the 'ProductX' project.

$2.$ List the names of employees who work on every project.

$3.$ List the names of employees who do not work on any project.

$4.$ List the names of all employees who have a dependent with the same first name as themselves