Q: Refraction concerns a changed direction of sound, radiation, a river or a missile?
What is the answer?

A: radiation

Q: Charles Stent practised what surgery, for which he invented his eponymous technique?
What is the answer?

A: dental

Q: In snooker, what is usually the maximum that can be scored in a single break?
What is the answer?

A: 147

Q: Which four letter word beginning with Y is the basic monetary unit of China, equal to 100 Fen?
What is the answer?

A:
yuan