Final answer:
The time signature of the extract in 'Killer Queen' from 0.00 to 0.50 is 12/8.
Step-by-step explanation:
The time signature of the extract in the song 'Killer Queen' from 0.00 to 0.50 is 12/8. A time signature tells you how many beats are in each measure and what type of note receives one beat. In this case, '12/8' means there are 12 eighth notes in each measure, and an eighth note receives one beat.