Attention, all Big Bang Theory fans! Are you ready to prove your dedication to the show that brought physics nerds into the spotlight?

Prepare yourself for the ultimate trivia challenge that will test even the most devoted viewers.

Purpose of this blog? To separate the casual watchers from the true devotees who can recite Sheldon’s spot speech verbatim.

If you’ve seen every episode multiple times or just enjoy the occasional rerun, there’s something here for everyone.

Performance is key, so grab your favorite hot beverage, channel your inner Sheldon, and see if you can answer these questions without consulting the sacred texts of the series.

Bazinga! It’s time to find out if you’re a true Big Bang Theory expert.

Fun Facts About The Big Bang Theory

1. Sheldon’s Shirts Tell a Story

Throughout The Big Bang Theory, Sheldon wears various superhero t-shirts. Interestingly, the color of his shirt often reflects his mood for that particular scene.

2. Penny Was Originally Katie

The show initially cast actress Amanda Walsh as “Katie,” a tougher, edgier version of Penny. However, test audiences didn’t connect with her, leading to Kaley Cuoco’s beloved character.

3. Real-Life Science Consultant

David Saltzberg, an actual physicist, reviewed scripts to ensure all scientific jargon was accurate. He also provided authentic equations featured in the background.

4. Amy’s Neuroscience Is Authentic

Mayim Bialik, who portrayed Amy Farrah Fowler, holds a real-life PhD in neuroscience. The show occasionally included real scientific references from her field of expertise.

5. “Bazinga!” Came from Grapefruit

Sheldon’s iconic catchphrase “Bazinga!” originated behind the scenes from writer Stephen Engel, who used it after successfully pulling a prank involving hollowed-out grapefruits.

Big Bang Theory Characters Trivia

1. What is Sheldon Cooper’s catchphrase?

Bazinga!

2. What is the name of Sheldon’s older brother?

George Cooper Jr.

3. What song does Sheldon want Penny to sing when he’s sick?

Soft Kitty

4. What is the name of Raj’s Yorkshire Terrier?

Cinnamon

5. Who does Howard Wolowitz marry?

Bernadette Rostenkowski

6. What is the full name of Amy Farrah Fowler?

Amy Farrah Fowler

7. What food does Sheldon refuse to eat?

Anything with bread that has been toasted on both sides

8. Where did Leonard Hofstadter earn his Ph.D.?

Princeton University

9. What is the name of Penny’s father?

Wyatt

10. What is Howard Wolowitz’s profession?

Aerospace Engineer

11. What is Sheldon’s favorite number?

73

12. What is the name of Sheldon’s childhood pet cat?

Lucky

13. What did Raj struggle with when talking to women?

Selective mutism

14. What instrument does Leonard play?

Cello

15. Where does Penny work before becoming a pharmaceutical sales rep?

The Cheesecake Factory

16. What is Sheldon’s middle name?

Lee

17. What nickname did Howard’s mother call him?

Howie

18. What is Raj’s sister’s name?

Priya Koothrappali

19. Who officiates Sheldon and Amy’s wedding?

Mark Hamill

20. What was Sheldon’s childhood dream job?

Train conductor

21. What does Howard’s belt buckle do?

Plays the original Star Trek theme

22. Who plays Sheldon Cooper’s nemesis Barry Kripke?

John Ross Bowie

23. What is the name of Sheldon’s favorite childhood TV show?

Professor Proton

24. What is Amy’s field of expertise?

Neurobiology

25. What superhero does Sheldon idolize?

The Flash

26. What’s the name of Leonard’s high school bully?

Jimmy Speckerman

27. What is Raj’s field of study?

Astrophysics

28. What is Penny’s last name?

Never revealed in the show

29. Who does Bernadette work for?

Zangen Pharmaceuticals

30. What was Sheldon’s password in one episode?

Spock’s home planet (Vulcan)

31. What does Raj’s father do for a living?

Gynecologist

32. What is the name of Howard and Bernadette’s first child?

Halley Wolowitz

33. What is Leonard allergic to?

Lactose

34. What is Sheldon’s favorite spot on the couch?

The leftmost seat on the main couch, closest to the window

35. Who does Howard impersonate often?

Nicholas Cage

36. What was Penny’s big break in acting?

A hemorrhoid cream commercial

37. What instrument does Sheldon play?

Theremin

38. Who was Raj’s first girlfriend?

Lalita Gupta

39. What was Amy’s pet name for Sheldon?

Moonpie

40. What does Howard’s mother often yell at him?

“Howard!”

41. What is Sheldon’s Meemaw’s real name?

Constance

42. Who gets tenure at Caltech?

None of the main characters

43. What kind of car does Penny drive in early seasons?

A red Volkswagen Golf

44. What song do Sheldon and Leonard’s mothers sing together?

Any Way You Want It

45. What is Sheldon’s online gaming name?

Obi-Wan

46. What do Howard and Raj call their magic act?

Mysterious Mysterio & the Enchanter

47. Who is Raj’s favorite Bollywood actress?

Aishwarya Rai

48. What is Bernadette’s Ph.D. in?

Microbiology

49. What item does Sheldon lend Penny that shocks everyone?

A napkin signed by Leonard Nimoy

50. What board game does Sheldon create?

Research Lab

51. What happens to Howard when he goes to space?

He gets motion sickness

52. What was the name of Sheldon’s childhood friend?

Tam Nguyen

53. Who does Leonard date before Penny?

Leslie Winkle

54. What is the name of Stuart’s comic book store?

The Comic Center of Pasadena

55. What is Raj’s dog’s favorite treat?

Butter

56. What is Sheldon’s favorite drink?

Hot chocolate (when sad)

57. What famous scientist does Sheldon insult on Twitter?

Neil deGrasse Tyson

58. What was Sheldon’s Halloween costume when he met Amy?

Doppler Effect

59. What is Amy’s favorite instrument?

Harp

60. What does Raj call his alter ego?

“Rajesh Koothrapali, ladies’ man”

61. Who does Penny marry?

Leonard Hofstadter

62. What was Leonard’s mother’s profession?

Neuroscientist and psychiatrist

63. What does Amy buy Sheldon as a gift?

A signed picture of Leonard Nimoy

64. Who is the first main character to get a doctorate?

Leonard Hofstadter

65. Where does Sheldon propose to Amy?

Outside her apartment building

66. What sport does Howard excel at?

Fencing

67. What does Raj often drink to talk to women?

Alcohol

68. What song does Sheldon compose for Amy?

“The Amy Farrah Fowler Song”

69. What was Howard’s failed invention?

A robotic arm

70. What is Penny’s dream job?

Actress

71. Who does Sheldon admire the most?

Professor Proton

72. What is the name of Amy’s apartment building?

Los Robles

73. What is Leonard’s experiment nickname?

Rocket Man

74. What fruit does Sheldon claim is evil?

Grapefruit

75. What is the title of Sheldon’s YouTube show?

Fun with Flags

76. Who is Howard’s best man at his wedding?

Raj Koothrappali

77. Who helps Penny get her pharmaceutical sales job?

Bernadette

78. What is the name of Howard and Bernadette’s second child?

Neil Michael Wolowitz

79. What is Sheldon’s last name?

Cooper

80.What is Leonard’s favorite science fiction franchise?

Star Trek

Fan Favourite Episode: Big Bang Theory Trivia

81. What is the title of the episode where Sheldon and Amy get married?

The Bow Tie Asymmetry

82. In which episode does Sheldon first say “Bazinga”?

The Monopolar Expedition

83. What happens in “The Bath Item Gift Hypothesis” that makes Sheldon hug Penny?

She gives him a napkin signed by Leonard Nimoy

84. In “The Adhesive Duck Deficiency,” why does Penny need Sheldon’s help?

She dislocates her shoulder in the bathtub

85. What is the name of the episode where Howard goes to space?

The Countdown Reflection

86. In “The Scavenger Vortex,” who surprisingly teams up well together?

Sheldon and Penny

87. Which episode introduces Amy Farrah Fowler?

The Lunar Excitation

88. In “The Staircase Implementation,” what is revealed about the broken elevator?

Leonard caused it to break with an experimental rocket fuel mishap

89. What is the name of the episode where Leonard and Penny finally get married?

The Matrimonial Momentum

90. In “The Justice League Recombination,” what superhero costume does Sheldon wear?

The Flash

91. What causes Sheldon to become obsessed with solving a physics problem in “The Einstein Approximation”?

He can’t sleep due to an unsolved equation

92. In “The Roommate Transmogrification,” who temporarily becomes Sheldon’s new roommate?

Raj

93. What game do Sheldon and Wil Wheaton face off in during “The Creepy Candy Coating Corollary”?

Mystic Warlords of Ka’a

94. What happens in “The 21-Second Excitation” that upsets Sheldon?

Wil Wheaton and his friends cut in line for a special screening of Raiders of the Lost Ark

95. Which episode features the gang playing Dungeons & Dragons with a special celebrity guest?

The Love Spell Potential (featuring Wil Wheaton)

96. In “The Parking Spot Escalation,” what does Sheldon do to get revenge on Howard?

He sits naked in Howard’s car

97. What major life event happens to Howard in “The Stag Convergence”?

His bachelor party leads to embarrassing revelations for Bernadette

98. In “The Precious Fragmentation,” what item do the guys fight over?

A prop ring from The Lord of the Rings

99. What does Sheldon do after getting fired in “The Bus Pants Utilization”?

He tries to form a smartphone app business with Leonard, Raj, and Howard

100. What is the shocking twist at the end of “The Cooper Extraction”?

Sheldon realizes how much his friends’ lives would be different without him

101. In “The Romance Resonance,” what romantic gesture does Howard do for Bernadette?

He writes and sings a love song for her at work

102. In “The Pants Alternative,” what embarrassing thing does Leonard do at an award ceremony?

He gets drunk and gives an outrageous acceptance speech

103. What happens when Penny gives Sheldon acting lessons in “The Thespian Catalyst”?

Sheldon dramatically overacts and scares Penny

104. In “The Justice League Recombination,” who refuses to wear a costume at first?

Penny

105. What milestone does Sheldon reach in “The Intimacy Acceleration”?

He experiences a simulated romantic connection with Penny

106. What event do Sheldon and Amy attend in “The Prom Equivalency”?

A recreated prom on the rooftop

107. In “The Werewolf Transformation,” what causes Sheldon to have a meltdown?

His barber is unavailable, and he can’t get a haircut

108. What does Howard try to teach Sheldon in “The Skywalker Incursion”?

How to drive

109. In “The Bakersfield Expedition,” why do the guys abandon their Comic-Con trip?

Their car is stolen

110. In “The Nerdvana Annihilation,” what oversized item does Leonard buy?

A replica of the time machine from The Time Machine

111. What does Sheldon try to teach Penny in “The Gorilla Experiment”?

Physics

112. In “The Recombination Hypothesis,” what significant event happens between Leonard and Penny?

They decide to try dating again

113. In “The Space Probe Disintegration,” what does Raj’s father finally allow him to do?

Stop relying on his parents’ money

114. In “The Vengeance Formulation,” what prank does Sheldon pull on Kripke?

He fills Kripke’s office with foam

115. In “The Shiny Trinket Maneuver,” how does Howard make things right with Bernadette?

He gives her a star-shaped locket

116. In “The Egg Salad Equivalency,” what does Sheldon accidentally do to his assistant Alex?

He unknowingly harasses her with inappropriate comments

117. In “The Relationship Diremption,” what does Sheldon decide to break up with?

String theory

118. In “The Military Miniaturization,” what ethical dilemma does Howard face?

The U.S. military wants to use his invention for classified purposes

119. What do Amy and Sheldon debate in “The Cohabitation Experimentation”?

Whether they can successfully live together

120. What game does Raj introduce to the group in “The Friendship Contraction”?

Mystic Warlords of Ka’a

121. What happens to Penny’s apartment in “The Spoiler Alert Segmentation”?

Amy temporarily moves in with Sheldon

122. In “The Indecision Amalgamation,” what dilemma does Raj face?

He struggles to choose between dating two women

123. What happens in “The Proton Resurgence” that makes Sheldon emotional?

Professor Proton tells Sheldon he respects him

124. In “The Champagne Reflection,” what career milestone does Sheldon reach?

He films the final episode of Fun with Flags

125. What happens in “The Stockholm Syndrome,” the final episode of the series?

Sheldon and Amy win the Nobel Prize

126. In “The Collaboration Contamination,” who surprisingly work well together?

Howard and Amy

127. What is Penny’s first acting role in “The Loobenfeld Decay”?

A production of Rent

128. In “The Opening Night Excitation,” what major step do Sheldon and Amy take?

They sleep together for the first time

129. What shocking thing happens to Sheldon in “The Bozeman Reaction”?

His apartment gets robbed

130. In “The Pants Alternative,” how does Sheldon react to alcohol?

He becomes overly confident and dances

131. In “The Holiday Summation,” what happens to Sheldon’s Christmas tree?

Amy and Sheldon argue, and the tree catches fire

132. In “The Bitcoin Entanglement,” what costly mistake does the gang realize they made?

They lost a hard drive containing valuable Bitcoin

133. What does Sheldon win in “The Toast Derivation”?

A napkin signed by Stan Lee

134. In “The Helium Insufficiency,” what black-market deal do Leonard and Sheldon make?

They buy helium illegally for an experiment

135. What happens in “The Cognition Regeneration” that shocks everyone?

Sheldon tries energy drinks and acts wildly

136. What childhood fear does Sheldon confront in “The Itchy Brain Simulation”?

Feeling guilty over unresolved problems

137. In “The Emotion Detection Automation,” what device does Raj try to use?

A machine that detects emotions

138. In “The Geology Elevation,” who does Sheldon feud with?

Bert the geologist

139. In “The Locomotion Interruption,” what trip does Sheldon go on?

A cross-country train trip

140. What unexpected event happens to Raj in “The Anxiety Optimization”?

He gains confidence after intense stress levels

141. In “The Maternal Congruence,” what shocking revelation does Beverly Hofstadter share with Leonard?

She kissed Sheldon

142. In “The Tangerine Factor,” why do Leonard and Penny go on their first date?

Penny breaks up with her boyfriend and decides to give Leonard a chance

143. In “The Work Song Nanocluster,” what business do Penny and Sheldon start together?

A homemade hair clip business

144. In “The Dumpling Paradox,” why does the gang need Penny to join their Halo night?

Howard ditches them for a girl

145. What event makes Sheldon flee to Texas in “The Thanksgiving Decoupling”?

Penny reveals she accidentally married Zack in Las Vegas

146. In “The Pants Alternative,” why does Sheldon need to give a speech?

He is receiving an award

147. What big life decision does Sheldon make in “The Stockholm Syndrome”?

He publicly acknowledges and appreciates his friends

148. In “The Itchy Brain Simulation,” what does Leonard have to wear for a long time?

An old, itchy sweater

149. What does Raj’s selective mutism force him to do in “The Grasshopper Experiment”?

Get drunk to talk to women

150. In “The Griffin Equivalency,” what happens when Raj gets featured in a magazine?

He becomes arrogant and starts acting superior to his friends

151. In “The Barbarian Sublimation,” why does Penny become addicted to online gaming?

She is feeling unfulfilled in her life

152. In “The Convention Conundrum,” why does Sheldon decide to throw his own comic convention?

He fails to get tickets for San Diego Comic-Con

153. In “The Space Probe Disintegration,” why does Sheldon agree to compromise?

He sees how much Amy sacrifices for him

154. In “The Justice League Recombination,” what costume does Raj wear?

Aquaman

155. What unexpected event happens to Leonard in “The Holographic Excitation”?

Penny shows interest in his work

156. In “The Scavenger Vortex,” what prize are the characters competing for?

A gold coin

157. In “The Long Distance Dissonance,” why does Amy worry about Sheldon?

Dr. Ramona Nowitzki starts showing interest in him

158. What does Sheldon do in “The Terminator Decoupling” when he sees Summer Glau on the train?

He tries to impress her but fails

159. In “The Closet Reconfiguration,” what emotional moment does Howard experience?

He finally reads a letter from his late father

160. In “The Spoiler Alert Segmentation,” why does Leonard consider moving out?

Sheldon refuses to be flexible about their roommate agreement

161. What is revealed in “The Precious Fragmentation” about the prop ring?

It was used in The Lord of the Rings movies

162. In “The Discovery Dissipation,” why does Sheldon become upset?

His accidental scientific discovery is being widely praised

163. What does Bernadette do in “The Change Constant” that surprises everyone?

She convinces Sheldon to embrace change

164. In “The 2003 Approximation,” why do Sheldon and Amy break up?

Amy feels Sheldon doesn’t take their relationship seriously

165. In “The Locomotive Manipulation,” what romantic milestone do Sheldon and Amy reach?

Sheldon kisses Amy for the first time

166. In “The Hawking Excitation,” what does Stephen Hawking do to Sheldon?

He corrects Sheldon’s math and makes fun of him

167. What does Leonard found in “The Dependence Transcendence”?

He may be relying too much on Sheldon

168. In “The Procreation Calculation,” what major decision do Sheldon and Amy discuss?

Having children in the future

169. In “The Maternal Capacitance,” why does Penny cry?

She relates to Leonard’s struggles with his mother

170. In “The Apology Insufficiency,” why does Sheldon accidentally cause trouble for Howard?

He tells the FBI something that costs Howard a security clearance

171. In “The Bitcoin Entanglement,” how much was the lost Bitcoin worth?

Over $5,000

172. In “The 43 Peculiarity,” what does Sheldon secretly do in a storage room?

Plays with a mystery chalkboard equation

173. In “The Santa Simulation,” why does Sheldon get upset?

The guys play a Christmas-themed Dungeons & Dragons game

174. In “The Egg Salad Equivalency,” why does Sheldon go to HR?

He unknowingly harasses his assistant

175. What does Penny do in “The Hesitation Ramification” that worries Leonard?

She proposes to him while drunk

176. In “The Middle-Earth Paradigm,” what does Sheldon dress up as for the Halloween party?

The Doppler Effect

177. In “The Bachelor Party Corrosion,” what embarrassing thing happens to Leonard?

His friends strip him down and tie him up

178. In “The Adhesive Duck Deficiency,” what hilarious situation happens to the guys?

They get high while camping

179. In “The Ornithophobia Diffusion,” what does Sheldon try to overcome?

His fear of birds

180. In “The Conference Valuation,” why does Amy get jealous?

Sheldon starts bonding with Bernadette over science

181. In “The Stockholm Syndrome,” what is the final scene of the series?

The gang eating together as the theme song plays softly

Fan Favourite Big Bang Theory Theories

1. Sheldon is Actually an Alien or a Robot

Some fans argue that Sheldon’s socially awkward behavior, extreme intelligence, and robotic tendencies suggest that he might not be entirely human.

His obsession with rules, inability to grasp sarcasm, and lack of emotional awareness have led some viewers to theorize that he could be an alien observing human life or even a highly advanced AI attempting to learn human emotions.

2. The Entire Show is a Story Told by Sheldon

This theory suggests that The Big Bang Theory is actually Sheldon Cooper narrating the events of his life. Given Sheldon’s precise memory and love for storytelling, it’s possible that the exaggerated characterizations of his friends stem from his perspective.

His unique way of remembering events could explain why some characters like Howard seem more cartoonish than real, and why Sheldon always seems to have the final say.

3. The Penny is in a Secret Witness Protection Program Theory

Some fans speculate that Penny’s last name was never revealed because she was placed in a witness protection program. Throughout the series, she avoids talking about her past in Nebraska and has vague references to old relationships and past troubles.

Her reluctance to share details about her background adds fuel to this theory, making fans wonder if there’s more to her than meets the eye.

4. Leonard and Penny’s Relationship is Doomed

Many fans believe that despite their happy ending, Leonard and Penny’s relationship was ultimately unsustainable. Throughout the series, Penny consistently expresses doubts about their future, and Leonard often feels insecure about their relationship.

Some argue that their fundamental differences Penny’s carefree attitude vs. Leonard’s neurotic tendencies would lead to an eventual breakup after the events of the series.

5. Howard and Bernadette’s Kids Were Never Meant to be Seen

Halley and Neil Michael Wolowitz, Howard and Bernadette’s children, are rarely seen on screen. Fans believe this was an intentional callback to Howard’s mother, who was only ever heard off-screen.

By continuing the tradition, the showrunners kept the joke alive, making it a humorous nod to Mrs. Wolowitz’s never-seen presence.

6. Raj’s Selective Mutism Was Psychological, Not Physiological

While Raj’s selective mutism was often played for laughs, some fans believe his inability to talk to women wasn’t a medical condition, but rather a deeply ingrained psychological issue.

The fact that alcohol or even the belief that he drank alcohol could help him overcome it suggests that it was more of a mental block than a true disorder.

7. The Show Takes Place in the Same Universe as Young Sheldon’s Future Documentary

In Young Sheldon, older Sheldon is heard narrating his childhood, leading fans to believe that The Big Bang Theory is actually part of a larger story one where Sheldon later compiles his life experiences into a documentary or memoir.

This theory suggests that The Big Bang Theory exists within Young Sheldon’s storytelling universe, making Sheldon the true author of both shows.

Wrapping It Up

Well, there you have it the ultimate test of Big Bang Theory knowledge!

No matter your score, we hope this trip through the quirky universe of Leonard, Sheldon, Penny, and the gang brought back some fond memories.

Remember, even Sheldon Cooper himself occasionally gets a physics question wrong (though he’d never admit it). The true joy comes from celebrating a show that made science cool and friendship endearingly awkward.

Hungry for more pop culture challenges? Don’t miss our other trivia collections on The Office. Test your Dunder Mifflin expertise!

Until next time, may your knowledge continue to expand like the universe itself hopefully faster than Wolowitz’s ego!