67% knows the answer to this question: "In 1991, what was made the official language of Puerto Rico? "

And do you know the answer to this one? "What do levees, bunds and weirs help prevent?"

37% knows the answer to this question: "Oil, coal and natural gas are known as what? "

And do you know the answer to this one? "Luxury vehicles such as Ferrari, Maserati, and Lamborghini are manufactured in what country? "

45% knows the answer to this question: "Which genre of fiction features historical events? "

And do you know the answer to this one? "Apart from the toga, what was the main article of Roman fashion?"

55% knows the answer to this question: "Which 2005 movie is about an abandoned zebra growing up believing he is a racehorse? "

And do you know the answer to this one? "As David St Hubbins might know, what kind of procedure are you having done if your doctor orders up a lumbar puncture?"

31% knows the answer to this question: "What US state is nicknamed "The Great Lakes state"? "

And do you know the answer to this one? "The Gulf of Taranto represents the arch of the foot of what boot-shaped country?"

41% knows the answer to this question: "Which 1950s James Dean film had a huge influence on teenage fashion? "

And do you know the answer to this one? "Elvis graduated from high school in which city in 1953?"

69% knows the answer to this question: "What is 31 time 8? "

And do you know the answer to this one? "What would be a 10% tip on a £23.50 restaurant bill?"

84% knows the answer to this question: "The start of which year was known as Y2K? "

And do you know the answer to this one? "The Louisiana Purchase was a transaction between France and which other country?"

81% knows the answer to this question: "Where is Jamaica located? "

And do you know the answer to this one? "What is 25% of 48"

87% knows the answer to this question: "During the American Revolution, militants dumped more than 92,000 pounds of tea into what city's harbor, enough for 18.5 million teabags? "

And do you know the answer to this one? "What nationality was Jean Moulin?"

68% knows the answer to this question: "In 2013, Hassan Rouhani became the new President of which country? "

And do you know the answer to this one? "What was the name of the online music store launched by Apple in 2001?"

47% knows the answer to this question: "What country's official name is Lao People's Democratic Republic? "

And do you know the answer to this one? "What is the word for the money you earn by leaving cash in the bank?"