Most of the oxygen in the air is produced by what chemical process?
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Question 2 of 10
Which of these devices would you most likely use to listen to music?
Question 3 of 10
Alfred J Gross invented this for doctors, who didn't like it, although the last people to use it were hospital doctors. Mind you, the tech behind it also powers garage openers. What is it?
Question 4 of 10
Which space probe landed on Mars in June 1999?
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Question 5 of 10
What country shares its name with an ink that is chemically inert, not affected by sunlight and virtually permanent?
Question 6 of 10
At 11:38 a.m., on January 28, 1986, just 74 seconds into its 10th mission, an O-ring ruptured, setting off a fiery explosion in the main fuel tank of which space shuttle?
Question 7 of 10
What happens to the pressure of water as depth under the water increases?
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Question 8 of 10
The grandfather paradox is held up as one of the risks of what improbable science fiction activity?
Question 9 of 10
Water freezes at what temperature?
Question 10 of 10
Wood's glass, which blocks most wavelengths of light, was originally used to encode messages. What kind of light does it let through?
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Who Sang Quizzes
Who Delivered This Track?
How many songs didn't you know?
Average Score: 8
82% knows the answer to this question:
"Which trumpeter serenaded us with “What a Wonderful World” (1967)?
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Who Sang These Songs?
How many artists did you know?
Average Score: 8
29% knows the answer to this question:
"Who originally rocked "Hound Dog" (1956)?
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Who Sang These 70s Songs?
Do you remember?
Average Score: 8
42% knows the answer to this question:
"Who sang "The House of the Rising Sun" (1964)?
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Dare to step out of your comfort zone?
Who Sang These 90s Hip-Hop Songs?
Average Score: 4
84% knows the answer to this question:
"Who sang the song, "Juicy" (1994)?
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Impossible Music Quiz
Nobody gets more than 5 right
Average Score: 6
95% knows the answer to this question:
"Who delivered "Help Me, Rhonda" (1965)?
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These Songs Are Iconic...
but who sang them? How many did you know?
Average Score: 7
58% knows the answer to this question:
"Who sang the song, "Runaround Sue" (1961)?
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General Knowledge Quizzes
Impossible Knowledge Quiz
A quiz only seniors will be able to score a decent score
Average Score: 6
83% knows the answer to this question:
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Do you know the answer to this riddle?
General Knowledge Quiz
Average Score: 5
65% knows the answer to this question:
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General Knowledge Quiz
We bet you won't be able to score a 10/10
Average Score: 5
57% knows the answer to this question:
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10 Mixed Questions
Drop us a comment when you score a perfect 10
Average Score: 4
38% knows the answer to this question:
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Difficult Knowledge Test
We challenge you to score a 6+
Average Score: 6
52% knows the answer to this question:
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10 Mixed Knowledge Questions
What was the hardest question?
Average Score: 4
37% knows the answer to this question:
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Math Quizzes
Math Quiz
We hope you're smart enough for these questions
Average Score: 8
86% knows the answer to this question:
"If you eat 23 sweets from a tub that contains 687 how many sweets do you have left?
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Math Quiz
Only those who are good with numbers stand a change!
Average Score: 9
28% knows the answer to this question:
"What is 123 times 4?
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Unbeatable Math Quiz
You won't score higher than a 6
Average Score: 8
83% knows the answer to this question:
"Doubling is the same as multiplying by which number?
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Math Quiz
Please let us know your score below
Average Score: 9
61% knows the answer to this question:
"What is 18 doubled?
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Math quiz for intelligent people
Average Score: 8
92% knows the answer to this question:
"What is 15 + 27?
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Can you solve this?
go to Math Quiz
Average Score: 9
50% knows the answer to this question:
"If a five day vacations costs 2500 dollars, how much does each day cost?
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Who sang these famous pop songs?
Extremely Hard History Quiz, most people score only 3 out of 10.