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Extremely hard mixed knowledge quiz, how many did you answer correctly?

Question 1

Who sang the famous song "You’ve Made Me So Very Happy" (1969)?

Question 2

What is the plural of vertex?

Question 3

In what year of the American Revolutionary War did 'The Battle of Breed's Hill' take place?

Question 4

Who sang the famous song "Tennessee Waltz" (1951)?

Question 5

Who sang the famous song "The Fool On The Hill" (1968)?

Question 6

Which team win the German football championships in both 1956 and 1957?

Question 7

Who designed most of the clothes for Audrey Hepburn in "Breakfast at Tiffany's"?

Question 8

What year did U.S. President Clinton get impeached?

Question 9

Who sang the famous song Constant Craving (MTV unplugged) (1993)?

Question 10

What is the approximate speed of light?