In all cities and some towns, the Mayor . . .shall nominate and, with the consent of the City Council . . ., appoint three residents of such City or town who shall have the qualifications required by law to hold a municipal office therein and who shall constitute a board to be known by the name of "Police Commission."
The appointees to the police commission shall hold office for 3 years. It shall be the duty of the police commission to examine all applicants whose applications have been referred to the commission as to their age, legal, mental, moral, and physical qualifications and their ability to fill the office as a member of the police force. It shall also be the duty of the police commission, subject to the approval of the Mayor, to make such rules regarding such examinations not inconsistent with this part or the laws of the state.