The Judge of the Municipal Court shall be appointed by the Mayor and approved by Council for a term which shall not extend beyond the term of the Council by which he is approved; and during his term he shall not be removed except for cause under the provisions of general law; provided, however, that should the Municipal Judge become physically or mentally incapacitated to the extent that, in the opinion of the Mayor, he is unable to perform properly the functions of his office, the Mayor may declare the office vacant.