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?
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?
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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Challenging History Questions
Can you score higher than a 5 in this hard quiz
Average Score: 9
100% knows the answer to this question:
"Which was Nazi Germanys largest concentration and extermination camp?
"
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History Trivia Quiz
10 history questions to train your brain
Average Score: 8
100% knows the answer to this question:
"Which ancient kingdom was ruled by the Pharaohs?
"
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10 questions about history!
go to quiz
Average Score: 8
100% knows the answer to this question:
"What was the name of the US's first music chart, which started recording sales in August 1958?
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Challenging Quiz About History
Are you smart enough for this quiz?
Average Score: 9
99% knows the answer to this question:
"In the Trojan War, Paris of Troy famously stole away which woman?
"
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Challenging Quiz About History
Are you smart enough for this quiz?
Average Score: 8
100% knows the answer to this question:
"Which of these is actually a famous battle in history?
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Quiz on History.
We think you can do way better than a lousy 6
Average Score: 9
100% knows the answer to this question:
"In 1982, 4 streets in which UK city were renamed after the members of the Beatles?
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History Quiz
Are you a Historian?
Average Score: 8
100% knows the answer to this question:
"Lance Armstrong won titles in which sport before being exposed as a cheat?
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History Quiz That Pushes Your Limits
Can you beat a rocking 7?
Average Score: 8
100% knows the answer to this question:
"The July Revolution of 1830 toppled Charles X in favor of Louis-Philippe. Where?
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Quiz about History
How many retries did you need?
Average Score: 7
100% knows the answer to this question:
"Which of these is a real book release from 2015, the latest in a long running series?
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Play This Geography Quiz Now!
It's going to be impossible to score a 6+
Average Score: 6
100% knows the answer to this question:
"Which country lies directly south of Mongolia?
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10 Geography Questions
How many did you answer correctly?
Average Score: 9
100% knows the answer to this question:
"The description "birthplace of American freedom" best relates to which landmark?
"
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Play This Geography Quiz Now!
It's going to be impossible to score a 6+
Average Score: 6
100% knows the answer to this question:
"Which country lies directly south of Mongolia?
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Challenging Geography Quiz
We hope you can handle this quiz!
Average Score: 8
99% knows the answer to this question:
"Which of these cities is located in Holland?
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Geology Quiz - How Much Do You Know?
Test Your Knowledge and See if You're Up to the Challenge
Average Score: 9
99% knows the answer to this question:
"On which body of water will surfers at Newquay catch the wave?
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Geography Quiz
What would be your dream travel destination?
Average Score: 7
98% knows the answer to this question:
"Which is the southern-most country in Africa?
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Geography Knowledge Trivia Quiz
Not a single soul will score a 10
Average Score: 8
96% knows the answer to this question:
"The river Nile is located on which continent?
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Quiz on Geography
Good luck making this fun quiz!
Average Score: 9
100% knows the answer to this question:
"In what city would you find Hyde Park, as well as Piccadilly, Trafalgar and Belgrave squares?
"
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Geography Quiz
Who dares to share his score in the comments?
Average Score: 9
100% knows the answer to this question:
"France shares a border to the south with which European Country?
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Very Hard Music Quiz
10 Questions
Average Score: 6
100% knows the answer to this question:
"What classic song contains the lyrics "And the forests will echo with laughter.."?
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Music Quiz
Can you do better than a 5 out of 10?
Average Score: 7
100% knows the answer to this question:
"What is a group of four performers called?
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Think you know your Beatles from your Stones?
Can you beat your friends' scores?
Average Score: 8
100% knows the answer to this question:
"Which band's drummer had the nickname "Ringo"?
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Challenging Music Quiz
We challenge you to score a 7+
Average Score: 7
100% knows the answer to this question:
"Italian Luciano Pavarotti was part of which music group?
"
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Play Music Quiz
We bet you're not a musician!
Average Score: 9
100% knows the answer to this question:
"Which record company was founded in Detroit by Berry Gordy, Jr, a former boxer, who applied many of the business techniques he'd seen working on the Ford assembly line?
"
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How often do you listen to music?
HARD Music Quiz
Average Score: 7
100% knows the answer to this question:
"Coolio reworked Stevie Wonder's "Pasttime Paradise," turning it into what song?
"
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How often do you listen to music?
HARD Music Quiz
Average Score: 7
100% knows the answer to this question:
"Coolio reworked Stevie Wonder's "Pasttime Paradise," turning it into what song?
"
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Challenging Music Quiz
We challenge you to do better than a 5 out of 10
Average Score: 8
99% knows the answer to this question:
"Who "stuck a feather in his hat and called it macaroni"?
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Challenging Music Quiz
We challenge you to do better than a 5 out of 10
Average Score: 8
99% knows the answer to this question:
"Who "stuck a feather in his hat and called it macaroni"?
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Science Quiz
Try scoring a perfect 10
Average Score: 10
100% knows the answer to this question:
"Poodle, collie, beagle and golden retriever are all types of what animal?
"
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HARD Science Quiz
Who can beat the average score?
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100% knows the answer to this question:
"What is a change in the form of a species over time called?
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Show us your score and you get mad respect
Hard Science Quiz
Average Score: 9
98% knows the answer to this question:
"A 'tracheotomy' is performed when what is blocked?
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Are you a Science Expert?
Prove it in the comments below
Average Score: 9
99% knows the answer to this question:
"What property is a measurement of how hot or cold something is?
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Nobody can score higher than a lousy 5
Science Quiz
Average Score: 7
90% knows the answer to this question:
"What do we call the teeth we grind our food with?
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Quiz For Scientists
Have you ever entered a science fair?
Average Score: 9
100% knows the answer to this question:
"Alexander Graham Bell and his assistant were the first two people to use this invention, but First Lady Lucy Hayes was the third. What?
"
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Can you score a perfect 10 in this Science quiz?
10 questions
Average Score: 9
100% knows the answer to this question:
"What is removed during an appendectomy?
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Nobody can score higher than a lousy 5
Science Quiz
Average Score: 7
88% knows the answer to this question:
"What do we call the teeth we grind our food with?
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Nobody can score a perfect 10
Quiz for Scientists
Average Score: 10
100% knows the answer to this question:
"Just below the epiglottis are two plates called the thyroid cartilage, which in turn meet to produce what body part with a fruity name?
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Who Sang These Songs?
Try scoring at least a 7. It's very hard!
Average Score: 10
100% knows the answer to this question:
"Who sang the famous song "Hey Jude" (1968) ?
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Do You Know Who Sang These Songs?
Try scoring a 6+
Average Score: 8
100% knows the answer to this question:
"Who sang the famous song "Pinball Wizard" (1969)?
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Who Sang These Songs? - Sudden End Style
How many songs didn't you know?
Average Score: 0
0% knows the answer to this question:
"Who sang the famous song "I Left My Heart in San Francisco" (1962)?
"
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Who Sang These Famous Classic Rock Songs?
What's your favorite classic rock hit? Let us know in the comments!
Average Score: 8
100% knows the answer to this question:
"Who sang the famous song "(I Can't Get No) Satisfaction" (1965)?
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Who Sang These Songs?
How many songs did you know?
Average Score: 6
100% knows the answer to this question:
"Who sang the famous song "Just Can't Get Enough (live)" (1985)
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60s music quiz
You won't score a perfect 10
Average Score: 8
100% knows the answer to this question:
"Who sang the famous song "Sunny Afternoon" (1966) ?
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Who Sang These Songs?
Will you be able to do a better job?
Average Score: 10
100% knows the answer to this question:
"Who sang the famous song "Peggy Sue" (1962)?
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60's music quiz
You won't score a perfect 10
Average Score: 8
92% knows the answer to this question:
"Who sang the famous song "Sunny Afternoon" (1966) ?
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Who sang these songs?
10 song questions
Average Score: 9
100% knows the answer to this question:
"Who sang the famous song "Take A Chance On Me" (1977) ?
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Challenging Food & Beverages Quiz
We challenge you to beat his score!
Average Score: 8
100% knows the answer to this question:
"Pop tarts can be heated in which of the following?
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Food and Beverage Quiz
Who is able to score higher than a lousy 4? Share if you did
Average Score: 9
100% knows the answer to this question:
"Which animal's meat is referred to as mutton, particularly when the animal is an adult?
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Test Your Culinary Knowledge with this Delicious Quiz
Show Off your result in the comments
Average Score: 10
100% knows the answer to this question:
"A cucumber preserved in vinegar or salt is called what?
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Food and Beverage Quiz
10 questions but you won't get them all correctly!
Average Score: 9
100% knows the answer to this question:
"What second largest island in the Mediterranean are canned herrings named for?
"
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10 fun questions about food you probably can't answer
Food Quiz
Average Score: 9
100% knows the answer to this question:
"What food group do oatmeal, brown rice and whole wheat belong to?
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Challenging Food Quiz
We bet you're not a true chef!
Average Score: 9
98% knows the answer to this question:
"Known for its sweet, deep-red flesh, what orange mutation probably first appeared in 17th century Sicily?
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Food & Beverages Quiz
We challenge you to score higher than a lousy 5
Average Score: 9
100% knows the answer to this question:
"Also called pieplant, what tart pink vegetable is often used as a pie filling?
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Unknown Fruit Quiz
No one scores a 6 or more in this unknown fruit quiz!
Average Score: 7
100% knows the answer to this question:
"What is the name of this unknown fruit?
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Challenging Food Quiz
10 HARD questions about food & beverages
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100% knows the answer to this question:
"if you order Chateaubriand, what type of meat will you be served?
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10 General Knowledge Questions
Let us know!
Average Score: 8
100% knows the answer to this question:
"3915+2614+1313 equals what number?
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Difficult Knowledge Test
We challenge you to score a 6+
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100% knows the answer to this question:
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General Knowledge Quiz
Beating a 6 is almost impossible
Average Score: 7
100% knows the answer to this question:
"20x12+214 equals what number?
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Challenging Trivia Quiz
We challenge you to beat his 6
Average Score: 7
100% knows the answer to this question:
"Approximately how many minutes are there in 9 Hours?
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Quiz on General Knowledge
What did you score?
Average Score: 9
100% knows the answer to this question:
"Indochinese, Sumatran and Bengal are all types of what?
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Can you beat my score of 9 out of 10?
Mixed Knowledge Quiz
Average Score: 8
100% knows the answer to this question:
"Which bird lays the largest eggs?
"
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HARD Trivia Quiz
It's impossible to beat this one!
Average Score: 7
100% knows the answer to this question:
"Who sang the famous song "The Battle Of New Orleans" (1959)?
"
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We have 10 Knowledge Questions for you!
Are you above average? Prove us!
Average Score: 8
100% knows the answer to this question:
"What is the answer to this simple equation: 13 + 13 + 1 3= ?
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Common Knowledge Questions
We bet you won't score higher!
Average Score: 6
100% knows the answer to this question:
"Who won the Best New Artist award at the 2019 Grammys?
"
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Tell us, what do you really know about literature?
We think not enough to get more than 4 answer correctly!
Average Score: 6
100% knows the answer to this question:
"What John Spyri story is about a girl who lives in the Alps?
"
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Literature Quiz
Who of our quizzers can get a perfect 10? Share below!
Average Score: 8
100% knows the answer to this question:
"What classic novel did D. H. Lawrence write in 1928?
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Literature Quiz
How much knowledge have you stored in you brain about Literature?
Average Score: 7
96% knows the answer to this question:
"What word means to award compensation to?
"
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Literature Quiz
Who is your favorite author?
Average Score: 8
99% knows the answer to this question:
"In "Robinson Crusoe", where is Robinson Crusoe stranded?
"
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Literature Test
What did you score? Share below if you dare!
Average Score: 8
100% knows the answer to this question:
"Who wrote the comedy "Midsummer Night's Dream"?
"
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10 Hard Movie Questions
What is the last movie you have seen?
Average Score: 7
98% knows the answer to this question:
"Which film star is married to Goldie Hawn?
"
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Crazy Quiz About Movies!
Nobody will be able to score a 7+
Average Score: 9
100% knows the answer to this question:
"Finish this famous movie title, "All About ___ ".
"
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Movies: 10 Daunting Questions
We hope you have watched enough movies
Average Score: 9
100% knows the answer to this question:
"The film "Jack the Giant Slayer" is a retelling of what tale?
"
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Movie Quiz Challenge
Think you have what it takes to do better than me?
Average Score: 8
99% knows the answer to this question:
"What type of film is "Kung Fu Panda 2"?
"
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We bet you can't even finish half of these movie titles in this quiz
Movie Quiz
Average Score: 9
100% knows the answer to this question:
" The Lord of the "...." (2003)
"
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Movie Quiz
What movie has your best memory?
Average Score: 8
100% knows the answer to this question:
"You call that a knife? What movie, starring Paul Hogan, got men bragging about the size of their knives?
"
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HARD Movie Quiz
Enjoy and share your score below in the comments
Average Score: 6
100% knows the answer to this question:
"The Turning is a modern take on what novella?
"
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Movie Quiz
What is the last movie you have seen?
Average Score: 8
97% knows the answer to this question:
"Which of these actresses is regarded as a sex symbol of the 1960s?
"
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Only 10% can complete all 10 of these movie titles
Movie Title Quiz
Average Score: 10
100% knows the answer to this question:
"Planet of the …..
"
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Math Quiz
We hope you're smart enough for these questions
Average Score: 8
100% 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
100% knows the answer to this question:
"What is 123 times 4?
"
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No one can score a 7 or better
Math Test
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97% knows the answer to this question:
"Which is the largest number?
"
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Math Quiz
Absolutely no one scores higher than a 5
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100% knows the answer to this question:
"What is an estimate?
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Math Quiz
Absolutely no one scores higher than a 5
Average Score: 8
100% knows the answer to this question:
"What is an estimate?
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Math Quiz
Only those who are good with numbers stand a change!
Average Score: 8
95% knows the answer to this question:
"How many feet long is a 100-yard football field?
"
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SUDDEN DEATH QUIZ
Try to stay on your feet!
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0% knows the answer to this question:
"How fast do you need to travel to go 150 miles in 3 hours?
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Math Quiz
Are you real mathelete? Let us know below!
Average Score: 8
100% knows the answer to this question:
"Which is the correct spelling?
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Math Quiz
Only those who are good with numbers stand a chance!
Average Score: 8
98% knows the answer to this question:
"What is 10% of 1,000?
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