Multiple choice general knowledge The first alarm clock could only ring at _ a.m ? 4:45 5 4:30 4 Reveal answer Fill a bubble to check yourself D Correct answer Explanation The first mechanical alarm clock was invented by Levi Hutchens in 1787 and was designed to ring only at 4 a.m. This early invention could not be set for different times like modern alarm clocks. Option D (4 a.m.) is historically accurate.