The Big Bang Theory
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176 free The Big Bang Theory trivia questions with answers — entertainment quiz, new questions added Oct 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!
Bazinga! even reached biology: in 2012 Brazilian scientists named a new orchid bee Euglossa bazinga because it had tricked them for some time by resembling another species.
Q 02Where does Penny work as a waitress when The Big Bang Theory begins?
The Cheesecake Factory
The Cheesecake Factory employs Penny as a waitress until season 7, when she quits to chase acting full-time.
Q 03At which university do Leonard, Sheldon, Howard and Raj work in The Big Bang Theory?
Caltech
Caltech fires Sheldon in season 1 for insulting his new department head, and takes him back only after his mother flies in and charms the boss.
Q 04What is the number of the apartment shared by Sheldon and Leonard?
4A
4A is Sheldon and Leonard's apartment until season 10, when Sheldon moves across the hall with Amy and leaves it to Leonard and Penny.
Q 05What social difficulty does Raj Koothrappali have in early seasons?
He cannot talk to women unless he has been drinking
He cannot talk to women unless he has been drinking, a mutism that lifts in the season 6 finale: after Lucy dumps him, he finds himself chatting to Penny sober.
Q 06What kind of scientist is Sheldon Cooper?
Theoretical physicist
Theoretical physicist Sheldon builds his career on string theory, then decides in season 7 that he has wasted his life on it and switches to dark matter.
Q 07In The Big Bang Theory's finale, what prestigious award do Sheldon and Amy receive?
The Nobel Prize in Physics
The Nobel Prize in Physics goes to Sheldon and Amy, and Sheldon scraps the speech he has been preparing since childhood to thank his family and friends instead.
Q 08Which Star Trek actor has a recurring role as a fictionalized version of himself on The Big Bang Theory?
Wil Wheaton
Wil Wheaton starts out on Sheldon's mortal-enemy list for skipping a 1995 convention the teenage Sheldon had travelled to see him at, but the two end up friends.
Q 09What is Howard Wolowitz's highest academic qualification, a running source of teasing from his friends?
Master's
Master's is where Howard stopped at MIT; in season 8 he joins Sheldon's class to start a doctorate, then drops it after the two spend the lessons humiliating each other.
Q 10Which Canadian band wrote and performs The Big Bang Theory's theme, 'The History of Everything'?
Barenaked Ladies
Barenaked Ladies were a lucky fit: when the show's creators asked for a theme song, the band's singer had just finished reading Simon Singh's book Big Bang.
Q 11Why did The Big Bang Theory end after its 12th season in 2019?
One of its stars chose to leave
One of its stars chose to leave: the actor behind Sheldon was ready to say goodbye, so the studio and network ended the show rather than carry on without him.
Q 12Which actress plays Penny in The Big Bang Theory?
Kaley Cuoco
Kaley Cuoco broke her leg in a 2010 riding accident, so Penny spent several episodes tending bar, with the cast hidden behind the counter.
Q 13What type of scientist is Amy Farrah Fowler?
Neurobiologist
Neurobiologist Amy gets a paper into the journal Neuron in season 5, and Sheldon is so unimpressed by the news that she walks out on their date.
Q 21Which actress plays Leonard's mother Beverly Hofstadter?
Christine Baranski
Christine Baranski plays Beverly Hofstadter, who thaws when she and Penny get drunk together in season 3 and ends the night by kissing Sheldon.
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
Microbiology is Bernadette's field; she waits tables to pay for her doctorate, and the job it wins her soon pays far more than Howard's, to his discomfort.
Q 14What is the name of Stuart Bloom's store, the group's regular hangout?
The Comic Center of Pasadena
The Comic Center of Pasadena burns down in the season 7 finale and reopens in season 8, where Howard is furious to find it furnished with his mother's furniture.
Q 15Which state is Sheldon Cooper originally from?
Texas
Texas is where Sheldon flees in the season 3 premiere after learning his friends tampered with his Arctic data, and they have to follow him there to coax him back.
Q 16Sheldon and Leonard's apartment building stands at which Pasadena address?
2311 North Los Robles Avenue
2311 North Los Robles Avenue even hosts a wedding: Howard and Bernadette marry on its roof in season 5, timed so a passing mapping satellite would photograph them.
Q 17Which theory do Sheldon and Amy develop together in The Big Bang Theory'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 Big Bang Theory?
Laurie Metcalf
Laurie Metcalf's real-life daughter Zoe Perry inherited the part, playing the younger Mary Cooper in the prequel Young Sheldon.
Q 20What is Leonard's mother's profession?
Neuroscientist
Neuroscientist and psychiatrist Beverly Hofstadter treats her son as a case study, even publishing a book about his childhood called The Disappointing Child.
Q 24In The Big Bang Theory's unaired pilot, what was the name of the female lead later 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 25Sheldon Leonard, namesake of The Big Bang Theory's two leads, produced which classic sitcom?
The Dick Van Dyke Show
The Dick Van Dyke Show began as a failed pilot starring its creator, Carl Reiner; Sheldon Leonard saw the fault and had the lead recast with Dick Van Dyke.
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
India is home to Raj's wealthy parents in New Delhi, who bankroll his lifestyle until season 10, when he tells his father to stop the money so he can stand on his own feet.
Q 29Which video game gets its own weekly night in Sheldon's schedule on The Big Bang Theory?
Halo
Halo night is every Wednesday; in season 1 Penny fills in for Howard and turns out to be a natural at the game, to Sheldon's disbelief.
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.