General Knowledge Quiz for Friday, 4 February 2011
A new general knowledge quiz is available every day. Try today's quiz or work through our archive of daily and themed quizzes.
Question 1: What is the word for the apparent change in frequency of a vibration due to the relative change in position of the observer?
A
B
Boyle's Law
Echo
C
Archimedes's Principle
D
Doppler effect