Multiple choice general knowledge math & puzzles

I went to bed at eight O'clock in the evening and wound up my clock and set the alarm to sound at nine O'clock in the morning. How many hours sleep would I get before being awoken by the alarm?

  1. 13

  2. 12

  3. 1

  4. No sleep at all

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A mechanical wind-up alarm clock does not distinguish between AM and PM. If set to 9, it will ring at the first 9 o'clock it reaches, which is 9 PM, just one hour later.