At the center of the iris is a round, black opening, whose special muscles expand or shrink to help you focus or adjust to lighting. As a biology student should know, what is this opening called?
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Difficult History Test
Take the test and show off your score
Average Score: 9
100% knows the answer to this question:
"Tony Blair is best known for holding what political position?
"
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History Quiz
Please share your score no matter how low or high
Average Score: 6
100% knows the answer to this question:
"In which century was pioneering nurse and heroine of the Crimean War Mary Seacole born?
"
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History Quiz
What did you score?
Average Score: 8
99% knows the answer to this question:
"Who founded the Ford Motor Company?
"
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10 Questions About History
We bet you'll never ever score a solid 10
Average Score: 9
100% knows the answer to this question:
"In what year was Maggie Thatcher first elected UK Prime Minister?
"
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Challenging History Quiz
Please tell us if you scored higher than a 5
Average Score: 9
100% knows the answer to this question:
"Who was murdered in the Ides of March in 44 BC by a group of senators led by Brutus and Cassius?
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History Trivia Quiz
Scoring higher than a 6 is impossible!
Average Score: 8
100% knows the answer to this question:
"In 2014, the International Court of Justice ruled that what country should stop its whaling program?
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History Quiz
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Average Score: 8
98% knows the answer to this question:
"Geli Raubal had commited suicide on September 18th 1931, but who was her well known uncle?
"
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Test your History skills
Let us know how you did in the comments
Average Score: 7
98% knows the answer to this question:
"In 1966, French and British media falsely report the death of what famous person?
"
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History Test
Can you score a 6 or better?
Average Score: 9
100% knows the answer to this question:
"In which state did Rosa Park refuse to give up her bus seat to a white passenger?
"
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Challenging Geography Quiz
We hope you can handle this quiz!
Average Score: 9
100% knows the answer to this question:
"Which of these countries has a population of over 1.2 billion?
"
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HARD Geography Quiz
This really is a hard one!
Average Score: 6
100% knows the answer to this question:
"Malta achieved independence from which European country in 1964?
"
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10 Geography Questions
Where did you go?
Average Score: 9
100% knows the answer to this question:
"In which country would tourists visit Ayers Rock?
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Have you ever been to Japan?
HARD Geography Quiz
Average Score: 6
100% knows the answer to this question:
"In what country was Citroen founded in 1919?
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Challenging Geography Quiz
We hope you can handle this quiz!
Average Score: 7
93% knows the answer to this question:
"Which of these capital cities is in Europe?
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Geography Quiz
You won't score a 6 or higher!
Average Score: 7
100% knows the answer to this question:
"With 1,000 plus rooms, what is the largest inhabited castle in the world?
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Sorry, you are just not good enough
to score a perfect 10!
Average Score: 8
100% knows the answer to this question:
"What is the capital city of the Central American country of Guatemala?
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Challenging Geography Quiz
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Average Score: 8
99% knows the answer to this question:
"Which of these cities is located in Holland?
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Geography quiz. Level Impossible.
Dare to share?
Average Score: 8
100% knows the answer to this question:
"The Harrods department store is in the Knightbridge neighborhood of which city?
"
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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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Challenging Music Quiz
We think scoring a 5+ is impossible
Average Score: 10
100% knows the answer to this question:
"Finish this line of lyrics: 'I've travelled each and every highway - And more, much more than this - I did it ___________'.
"
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Music Quiz
Hats off if you're able to score a perfect 10
Average Score: 7
98% knows the answer to this question:
"The song from which film won the 1997 Oscar for Best Song?
"
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Challenging Music Quiz
We challenge you to score a 6 or higher
Average Score: 7
86% knows the answer to this question:
"According to the famous song, where does John Brown's body lie?
"
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HARD Music Quiz
Let us know your score in the comments below
Average Score: 7
89% knows the answer to this question:
"Who wrote the opening to "California Girls" the first time he took acid?
"
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New Music Trivia
Can you answer all music questions correctly?
Average Score: 9
100% knows the answer to this question:
"Which of these is the name of a '60s song by Bob Dylan?
"
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Challenging Music Quiz
We think scoring a 5+ is impossible
Average Score: 9
100% knows the answer to this question:
"Which of these was a member of The Beatles?
"
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Music Quiz For Intelligent People
Are you smart enough?
Average Score: 7
100% knows the answer to this question:
"After a brief mid-career effort to play for the Detroit Lions, who included two of the Lions (Mel Farr and Lem Barney) portraying party-goers in the background of "What's Going On"?
"
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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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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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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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Science Quiz
Are you smarter than a astronaut? Prove us by score higher than a 6
Average Score: 10
100% knows the answer to this question:
"What protective layer surrounds Earth?
"
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Mad Science Quiz
Can you do better than a 7?
Average Score: 8
100% knows the answer to this question:
"When you shuffle along carpets on dry days, the friction builds up your negative charge, which is attracted to the positive charge on a doorknob. What does that produce?
"
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Try scoring a 10 out of 10
10 HARD Science Questions
Average Score: 7
100% knows the answer to this question:
"John Luther Jones of Cayce, Kentucky, has a special place in railway lore. By what name is he better known?
"
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Science Quiz
Are you worthy of the respect?
Average Score: 8
99% knows the answer to this question:
"What growth do pine trees have where most other trees have leaves?
"
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Show us your score and you get mad respect
Hard Science Quiz
Average Score: 9
97% knows the answer to this question:
"A 'tracheotomy' is performed when what is blocked?
"
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Play This Science Quiz
Only for quizzers with an high IQ
Average Score: 9
100% knows the answer to this question:
"Most of the oxygen in the air is produced by what chemical process?
"
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HARD Science Quiz
Who can beat the average score?
Average Score: 8
100% knows the answer to this question:
"What is a change in the form of a species over time called?
"
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Who sang these songs?
10 questions about music
Average Score: 6
100% knows the answer to this question:
"Who sang the famous song "Djangology" (1949)?
"
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Who Sang These Songs From The 70s?
10 hard questions
Average Score: 9
100% knows the answer to this question:
"Who sang the famous song "Fernando" (1975) ?
"
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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 This Song: Sudden Death Style
Nobody will reach question 12
Average Score: 0
0% knows the answer to this question:
"Who sang the famous song "Time After Time" (1984) ?
"
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Who sang these songs?
Music Quiz
Average Score: 9
99% knows the answer to this question:
"Who sang the famous song "Fly Me To The Moon" (1964) ?
"
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Who Sang These Psychedelic Rock Songs?
How many rock songs did you know?
Average Score: 8
99% knows the answer to this question:
"Who sang the famous song "Good Vibrations" (1966)?
"
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Who Sang These Songs?
You'll never ever score higher than a 6
Average Score: 6
100% knows the answer to this question:
"Who sang the famous song "Disco Inferno" (1976)?
"
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Who Sang These Songs?
Did you know these songs?
Average Score: 9
98% knows the answer to this question:
"Who sang the famous song "Lay Lady Lay" (1969)
"
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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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Challenging Food Quiz
10 HARD questions about food & beverages
Average Score: 6
100% knows the answer to this question:
"if you order Chateaubriand, what type of meat will you be served?
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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:
"By what name is Beijing kao ya better known in the West?
"
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Can you answer all 10 questions correctly?
Challenging Quiz About Food & Beverages
Average Score: 7
100% knows the answer to this question:
"The gland which controls your metabolism is called what?
"
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Food & Beverages Quiz
Did you top a 6? Please tell us!
Average Score: 8
100% knows the answer to this question:
"Where would you find mussels?
"
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Food & Beverages Quiz
Are you able to score a perfect 10?
Average Score: 10
99% knows the answer to this question:
"Which of the following breakfasts has the most nutritional value?
"
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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 & 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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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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Scoring a 5 or higher is almost impossible
Play this quiz
Average Score: 8
98% knows the answer to this question:
"What sport was the subject of the film National Velvet?
"
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No human soul will be able to score a 4 or better
Challenging Trivia Quiz
Average Score: 9
100% knows the answer to this question:
"Construction started on a wall dividing which European city in 1961?
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Brain Exercise Quiz
Start training your brain
Average Score: 9
98% knows the answer to this question:
"Which word means to form a mental picture of something?
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General Knowledge Quiz
We challenge you to score a 7+
Average Score: 8
95% knows the answer to this question:
"On what continent is the world's largest glacier?
"
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Quiz about Mixed Knowledge
Are you ready to score a perfect 10?
Average Score: 8
100% knows the answer to this question:
"What is the answer to the sum 23+34+99?
"
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Are you smarter than the average player?
Find out by scoring an 8 or higher
Average Score: 8
99% knows the answer to this question:
"A boat sailed 3km on day one and 15km on day two. What was the total distance travelled?
"
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HARD Knowledge Quiz
No one scores a perfect 10
Average Score: 6
100% knows the answer to this question:
"In what year was the Ethernet Computer Network established?
"
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Challenging Mixed Trivia
We doubt you can score a 10 in this trivia quiz
Average Score: 8
99% knows the answer to this question:
"Which famous guitarist died in 1970?
"
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Quiz for the Exceptionally Intelligent
An 8+ is considered genius
Average Score: 9
100% knows the answer to this question:
"What is the largest island in the continental United States?
"
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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
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 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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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
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 Quiz
How much knowledge have you stored in your brain about Literature?
Average Score: 6
84% knows the answer to this question:
"Which king said "A horse, a horse! my kingdom for a horse!"?
"
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Literature Quiz
We challenge you to score an 8+
Average Score: 7
99% knows the answer to this question:
"Which one of these means an animal's poisonous fluids?
"
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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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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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Movie Quiz
Can you top a 6 out of 10
Average Score: 8
98% knows the answer to this question:
"Climb Every Mountain is from which film musical?
"
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Quiz about Movies
What is the last movie you saw?
Average Score: 8
99% knows the answer to this question:
"What animated movie is based on "The Snow Queen" by Hans Christian Andersen?
"
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It's highly doubtful you can complete even half of these movie titles in this quiz.
Movie Quiz
Average Score: 9
100% knows the answer to this question:
"One Flew Over the Cuckoo's "..." (1975)
"
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Movie Quiz
Can you score perfect 10?
Average Score: 6
100% knows the answer to this question:
"What is Whoopi Goldberg's character doing for a living before posing as a nun after witnessing a mob killing?
"
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Movie Quiz
Click to start this quiz
Average Score: 7
99% knows the answer to this question:
"How would you categorise the film The Texas Chainsaw Massacre?
"
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Movie Quiz
Leave your favorite Horror movie below in the comments
Average Score: 6
98% knows the answer to this question:
"Which movie is about a bored married couple surprised to learn that they are both assassins?
"
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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 ___ ".
"
-
Math Quiz
We hope you can do better than a simple 5
Average Score: 9
99% knows the answer to this question:
"180+124+68 equals what number?
"
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Test Your Math Knowledge
Absolutely nobody scores a solid 10
Average Score: 9
98% knows the answer to this question:
"What number when added to 1661, gives 2723?
"
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Challenging Mathematics Quiz
Prove us if you are a true Mathematics Mastermind!
Average Score: 8
99% knows the answer to this question:
"What is 0.6 as a percentage?
"
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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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No one can score a 7 or better
Math Test
Average Score: 9
97% knows the answer to this question:
"Which is the largest number?
"
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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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Math Quiz
Only those who are good with numbers stand a change!
Average Score: 8
94% knows the answer to this question:
"How many feet long is a 100-yard football field?
"
-
Unbeatable Math Quiz
You won't score higher than a 6
Average Score: 8
99% knows the answer to this question:
"Doubling is the same as multiplying by which number?
"
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Challenging Math Quiz
You aren't smart enough to score a solid 10!
Average Score: 8
100% knows the answer to this question:
"76 plus 36 gives which result?
"