Answer:
I am a king but also a common device of measure. What am I?
They can be long or short; they can be grown or bought; they can be painted or left bare; they can be round or square.
A colorful cuisine without flesh
What comes down but never back goes up?
I can be found in seconds, minutes and centuries, but not in days, years or decades.
I am a room that has a roof but no walls. What am I?