Ordinances making the annual tax levy, appropriation ordinances, ordinances and resolutions pertaining to local improvements and assessments, ordinances and resolutions providing for or directing any investigation of City affairs, resolutions requesting information from administrative officers or directing emergency measures, shall take effect at the time indicated therein. Except as otherwise prescribed in this Charter or the general law of the State, all other ordinances and resolutions shall take effect at the time indicated therein, but not less than thirty days from the date of their passage.