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127 free The Big Bang Theory trivia questions with answers — entertainment quiz, new questions added Aug 2026.
56 free The Big Bang Theory trivia questions with answers. From Bazinga to the Nobel Prize, The Big Bang Theory gave us 12 seasons of laughs, science, and unforgettable characters. Whether you're a casual viewer or a die-hard fan who can recite the Roommate Agreement, this quiz covers everything from character quirks and plot twists to behind-the-scenes secrets and real science references.
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Q 01What is Sheldon Cooper's catchphrase that he uses when pulling a prank or making a joke?
Bazinga!
Sheldon's catchphrase is "Bazinga!", first heard in the season 2 finale "The Monopolar Expedition" (2009) after he pranks Leonard.
Q 02Where does Penny work as a waitress when she is first introduced on the show?
The Cheesecake Factory
Penny works as a waitress at The Cheesecake Factory while pursuing her acting career.
Q 03At which university do the main characters work?
Caltech
The main characters work at the California Institute of Technology (Caltech) in Pasadena.
Q 04What is the number of the apartment shared by Sheldon and Leonard?
4A
Sheldon and Leonard share Apartment 4A, while Penny lives across the hall in Apartment 4B.
Q 05What social difficulty does Raj Koothrappali experience in the early seasons?
He cannot talk to women unless he has been drinking
Raj has selective mutism around women in the early seasons and can only speak to them after consuming alcohol.
Q 06What kind of scientist is Sheldon Cooper?
Theoretical physicist
Sheldon is a theoretical physicist specializing in string theory and related areas.
Q 07In the series finale, what prestigious award do Sheldon and Amy receive?
The Nobel Prize in Physics
Real laureate Frances Arnold, a chemical engineer, appeared as herself in the same final season.
Q 08Which Star Trek actor has a recurring role as a fictionalized version of himself on the show?
Wil Wheaton
Wheaton starts out as number six on Sheldon's mortal-enemy list for skipping a 1995 convention, before the two eventually become friends.
Q 09What is Howard Wolowitz's highest academic qualification, a running source of teasing from his friends?
Master's
Howard only holds a Master's degree in Engineering from MIT, which is a frequent source of teasing from the others who all have doctorates.
Q 10Which Canadian band wrote and performs The Big Bang Theory's theme, 'The History of Everything'?
Barenaked Ladies
Barenaked Ladies wrote and performed 'The History of Everything' for the show's 2007 debut.
Q 11How many seasons did The Big Bang Theory run?
12
The Big Bang Theory ran for 12 seasons from 2007 to 2019.
Q 12What is the name of the actress who plays Penny?
Kaley Cuoco
When Cuoco broke her leg in 2010, Penny was written in as a bartender for several episodes to hide the cast.
Q 13What type of scientist is Amy Farrah Fowler?
Neurobiologist
Amy Farrah Fowler is a neurobiologist who studies addiction in primates, among other things.
Q 14What is the name of Stuart Bloom's store, the group's regular hangout?
Q 21Which actress plays Leonard's mother Beverly Hofstadter?
Christine Baranski
Christine Baranski plays Beverly Hofstadter, Leonard's brilliant but emotionally distant psychiatrist mother, first appearing in season 2's "The Maternal Capacitance".
Q 22Bob Newhart won an Emmy playing Arthur Jeffries, the aged host of which children's science show Sheldon idolised?
Professor Proton
Professor Proton had become a children's party entertainer by the time Sheldon meets him in season six, a turn that earned Newhart a Primetime Emmy.
Q 23What is Bernadette's field of scientific expertise?
Microbiology
The Comic Center of Pasadena
Stuart Bloom's store is The Comic Center of Pasadena; it burns down in the season 7 finale and reopens in season 8 with money and furniture from Howard's mother.
Q 15Which state is Sheldon Cooper originally from?
Texas
Sheldon and his twin sister Missy were born in a Kmart in Galveston and raised in the fictional East Texas town of Medford.
Q 16Sheldon and Leonard's apartment 4A is in a building at which Pasadena address?
2311 North Los Robles Avenue
2311 North Los Robles Avenue, Pasadena, California, is the address of Apartment 4A.
Q 17Which theory do Sheldon and Amy develop together in the show's final season?
Super-asymmetry
Sheldon and Amy develop super-asymmetry, an idea sparked by Sheldon's lopsided bow tie minutes before their season 11 wedding; the paper drives the final season's science arc.
Q 18What major life event does Howard experience that none of his friends do until much later seasons?
Going to space
Howard goes to the International Space Station as a payload specialist, a major storyline in Season 5/6.
Q 19Who plays Sheldon's mother, Mary Cooper, in the original series?
Laurie Metcalf
Metcalf's real-life daughter, Zoe Perry, plays the younger Mary Cooper in the prequel Young Sheldon.
Q 20What is Leonard's mother's profession?
Neuroscientist
Beverly Hofstadter is a psychiatrist and neuroscientist whose cold, clinical approach to raising Leonard is a running joke.
Microbiology is Bernadette's field, and her Cheesecake Factory wages paid for the graduate studies.
Q 24What was the name of the female lead in the unaired pilot, before the character was replaced by Penny?
Katie
Katie, played by Amanda Walsh, was written as a street-hardened tough girl; test audiences disliked her, so the show was reworked around a sunnier neighbour.
Q 25What famous TV producer are Sheldon and Leonard named after?
Sheldon Leonard
The characters are named after Sheldon Leonard, the legendary TV producer known for The Dick Van Dyke Show and The Andy Griffith Show.
Q 26What does Sheldon say between each of his knocks when he arrives at someone's door?
The person's name
Sheldon says the person's name between each of his three knocks; in season 10 he explains the habit began at age 13 after walking in on his father with another woman.
Q 27In which field is Howard an engineer?
Aerospace
Howard is an aerospace engineer who designs hardware for NASA missions, including the zero-gravity waste disposal system that famously malfunctions in season 2.
Q 28In which country does Raj's family live?
India
Raj comes from a wealthy family in New Delhi, India. His father is a gynecologist.
Q 29Which night of the week is Halo night for the group?
Wednesday
Halo night is Wednesday, established in season 1's "The Dumpling Paradox", when Penny joins the guys' game for the first time.
Q 30What online platform did Amy and Sheldon use to first meet?
A dating website
Howard and Raj signed Sheldon up on a dating website, which matched him with Amy Farrah Fowler based on their compatibility.