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Science General Knowledge #3

Can you answer these random questions from the realm of science?
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Quizmaster
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Last updated: March 13, 2020
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First submittedMay 15, 2016
Times taken95,650
Average score65.0%
Rating4.54
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Question
Answer
What are the three major types of rock?
Igneous
Metamorphic
Sedimentary
What theory states that universe expanded from an extremely hot
dense state about 13.8 billion years ago?
Big Bang Theory
What "ology" is the study of weather?
Meteorology
What part of a human cell has its own non-human DNA?
Mitochondria
What prefix is the opposite of hypo?
Hyper
What is thought to be at the center of the Milky Way?
Supermassive
black hole
Through what process does the sun turn hydrogen into helium?
Nuclear fusion
What unit of power is defined as one joule per second?
Watt
Where can one find a stalagmite?
In a cave
What does a thermophile love?
High temperatures
What is the term for the distance between the Earth and the Sun?
Astronomical Unit
What kingdom do yeasts and mushrooms belong to?
Fungi
What is measured on the Enhanced Fujita scale, with the highest rating being EF-5?
Tornadoes
What gas is the primary reason for human-caused global warming?
Carbon dioxide
What gland, located at the base of the brain, produces human growth hormone?
Pituitary
What substance, added to salt, has largely eliminated cretinism in the developed world?
Iodine
What does a Geiger counter measure?
Ionizing radiation
What is commonly known as "laughing gas"?
Nitrous oxide
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81 Comments
cpgatbyu
+5
Level 87
May 15, 2016
"Human mitochondrial DNA was the first significant part of the human genome to be sequenced." (Wikipedia) Why do you say it is non-human?
orange3472
+3
Level 71
Apr 8, 2024
Mitochondria have circular DNA, indicating they were once bacteria but were taken up by a eukaryotic cell. Therefore, the DNA is not originally from humans.

*See endosymbiotic theory*

Sputnix
+1
Level 69
Sep 21, 2025
Agree I also don’t understand why the human mitochondria DNA would not be human. Yes it probably originated from some sort of bacteria a billion years ago, but the same goes for the DNA in the core. We could not be human without either
Jerry928
+2
Level 76
May 15, 2016
Also accept radioactivity?
Quizmaster
+1
Level ∞
May 16, 2016
Okay
Swanbabe
+1
Level 37
Sep 21, 2016
Discovered by Madame Curie
dunkinggandalf2
+1
Level 71
Oct 16, 2020
It's in the air for you and me
sillie
+1
Level 75
May 16, 2016
How about "mitochondrium" for us non-English folks? Feels unfair to get "mitochondri" right and then not get it because failed on the last letter. Especially when you accept just "nitrous" for nitrous oxide. (Which should probably also be "nitros" in American, because "colour" becomes "color" and so on..)
Quizmaster
+9
Level ∞
May 16, 2016
Mitochondrium would have worked. Also, o and ou have different sounds. Webster didn't just replace every ou with an o.
TWM03
+7
Level 72
Sep 1, 2021
Thanks four this explanatioun, I just fond ot soumething interesting!
Azerk
+1
Level 64
Sep 27, 2022
I hate this lmao
mahble
+3
Level 79
Feb 24, 2018
Mitochondrium is the singular of mitochondria, so it really should be accepted anyway.
ddddan
+4
Level 85
May 29, 2020
I thought the singular was mitochondrion

https://en.wikipedia.org/wiki/Mitochondrion

Azerk
+1
Level 64
Sep 27, 2022
It is.
Sulps
+5
Level 55
Sep 18, 2016
So, cretin is not only an insult. Today I learned.
SundarIsaacs
+1
Level 58
Nov 10, 2016
+1!
RobNobody
+2
Level 80
Sep 26, 2022
A lot of terms like that actually started out as technical classifications in psychiatry.
svitapeneela
+4
Level 64
Sep 18, 2016
I don't understand why you just accept Nitrous, without the Oxide.

That's like asking who wrote Great Expectations and just accepting Charles! haha

Sterref10
+1
Level 61
Sep 18, 2016
I agree with that. Some people, like me, knew the whole name. Other may only know the first word, and would still get the point, whereas some who only know the second word wouldn't, despite both knowing only 50% of the answer. How is that fair?
ChaosQuizzer
+2
Level 35
Sep 22, 2016
Have you played any racing games?
cornflakesfu
+8
Level 89
Jul 26, 2018
"Nitrous oxide, commonly known as laughing gas or nitrous . . ." (emphasis mine)
coc0a
+4
Level 34
Jul 29, 2022
I think its called nitrous colloquially when used as a recreational drug. IMO colloquialisms should be fine, as they are common names used for the substance
cricketwes
+1
Level 56
Sep 18, 2016
I would say a Geiger counter measures decays/counts per second
Malbaby
+1
Level 70
Sep 20, 2016
Bully for you!
tom88
+1
Level 77
Mar 3, 2020
what type of decays would those be?
babbaloo7
+12
Level 49
Sep 21, 2016
I really hoped that "Nougat" worked for the Milky Way question. I was sorely disappointed.
Haddies
+2
Level 35
Sep 22, 2016
Hahahaha :-)
prs17
+1
Level 74
Sep 22, 2016
"Epi" could also fit as the opposite of "hypo" - hypo meaning deep (hypodermic, hypocenter [of earthquakes]; epi mean surface - (epidermis, epicenter).
Treehouse225
+1
Level 25
Sep 23, 2016
Accept NO for Nitrous Oxide
mushroomsteve
+19
Level 52
Sep 27, 2016
NO.
phalocrocorax
+6
Level 84
Nov 4, 2016
NO is something different. Nitrous oxide is N2O, which is accepted.
RobNobody
+4
Level 80
Sep 26, 2022
NO is nitric oxide, not nitrous oxide.
dirtylenzes
+5
Level 50
Feb 9, 2017
The hint should say "What is the power house of the cell.
pkerr116
+11
Level 71
Aug 1, 2017
Three types of rock. Classic, grunge, alternative?
cornflakesfu
+8
Level 89
Jul 26, 2018
You forgot art, experimental, garage, glam, hard, heartland, indie, occult, progressive, psychedelic, punk, roots, soft, blues, country, dance, electronic, folk, funk, industrial, Latin, noise, pop, raga, rap, reggae, samba, stoner, and sufi.
TheCrusher
+1
Level 70
Feb 13, 2018
How about "warmth" for thermophilia?
Ponderosa
+1
Level 89
Oct 22, 2019
Or heat?
Quizmaster
+1
Level ∞
Mar 13, 2020
Heat would have worked. Warmth will work now as well.
EcceHomo
+2
Level 85
Apr 27, 2021
I think you mean now rather than not.
Sifhraven
+1
Level 76
Jan 4, 2019
I basicly typed everything besides tornadoes, twice, (4 times if you count singular and plural...) storm, hurricane, typhoon, cycloon, (and another one I believe...) And yea I know, they arent all interchangable.
NauruPalau
+2
Level 49
Jan 2, 2020
Put nitrogen oxide and nitric oxide 🙄
RobNobody
+1
Level 80
Sep 26, 2022
Why should they accept incorrect answers?
JackintheBox
+1
Level 82
Aug 6, 2024
I tried nitrogen oxide too 🤦‍♂️
SpartanLlama
+1
Level 77
Mar 3, 2020
Got Iodine
Xtrordinary
+3
Level 74
Aug 3, 2024
can i have some?
Yanni47
+2
Level 79
Mar 3, 2020
On the yeast and mushroom question, for a brief moment I was tempted to write Mushroom Kingdom...
AntiMatter8192
+3
Level 77
Mar 29, 2020
Can you please accept SMBH for SuperMassive Black Hole?
Werifesteria
+2
Level 66
May 29, 2020
I feel like hot springs or hydrothermal vents should work for thermophiles because that's really where you hear that term
Lilylee
+1
Level 78
May 29, 2020
Someone really loves his rocks, I've seen that question so many times on this site.
ander217
+2
Level 74
May 29, 2020
And yet I always forget one of them every time - usually a different one each time.
loganite
+1
Level 93
May 29, 2020
Maybe accept some type ins for the global warming clue? I tried greenhouse gas(ses), gas emissions, emissions, flourocarbons, oil, and a few others.
RobNobody
+3
Level 80
Sep 26, 2022
But the question is asking "Which gas..."
SWATkun
+1
Level 59
May 29, 2020
Accept Wind Speed for Tornadoes, Saprophytes for Fungi and Clorofloro Carbons for CO2
Quizmaster
+5
Level ∞
May 29, 2020
No thanks.
bulldog1969
+2
Level 60
May 29, 2020
I love that nos is accepted for nitrous oxide. Nice
Quincyz
+1
Level 24
May 30, 2020
Accept metamorphous for metamorphic. That's what I learned in school.
TurkeyCookTime
+1
Level 85
Jun 2, 2020
I tried "Nitric Oxide". sigh...
SpammyMcSpamface
+1
Level 53
Sep 21, 2020
Can you add NO2 as an option for nitrous oxide?
Moos1005
+1
Level 88
Oct 27, 2020
What unit of power is defined as one Joule per second?

Yes!

melodi
+1
Level 49
Jun 18, 2021
could you please also add magmatic as an alternative for igneous rocks
Abby
+3
Level 47
Aug 15, 2021
But you forgot to mention that the mitochondria is the powerhouse of the cell
creepycat
+1
Level 26
Mar 8, 2022
You can accept Mycota also for Kingdom Fungi. Both are correct imo.
ryantheman
+3
Level 68
Jun 8, 2022
It is no longer 'thought' that the Milky Way has a black hole at the center, we even have pictures /a> of it now :)
jmellor13
+1
Level 68
Sep 26, 2022
I got "nitrous oxide" from the movie Black Sheep, "Supermassive Black Hole" from the Muse song of the same name, "fusion" from the They Might Be Giants song "Why Does the Sun Shine?" and although I knew the answer anyway, I note that the clue for the Big Bang Theory is a close paraphrasing of the opening line to the theme song of the show of the same name. Education through television!
Azerk
+1
Level 64
Sep 27, 2022
I put Nitric Oxide and not Nitrous Oxide...gahhh
DrCoolKid69MD
+1
Level 69
Sep 27, 2022
I love how many people in the comments are so confident correcting the quiz when they know nothing about anything
MelvinHaze
+1
Level 56
Dec 31, 2025
In that respect, it's a reflection of the world in general.
Tbbt5
+5
Level 32
Dec 13, 2022
Omg I didn't read the title and tried to put metal and alternative as types of rocks
SpartanLlama
+1
Level 77
Feb 2, 2023
Love this
SpartanLlama
+1
Level 77
Feb 2, 2023
17/20, missed radiation, tornadoes, and astronomical unit
jarmez
+1
Level 45
Jul 19, 2023
tried warm temperatures, then tried hot temperatures and gave up..... nice
jasthemagician
+1
Level 29
Nov 7, 2023
Please accept "stellar nucleosynthesis" as an answer with nuclear fusion, it's valid too
Psyduckthgreat
+2
Level 72
Dec 7, 2023
The cause of global warming is a matter of controversy, and shouldn't be a fact question.
RobNobody
+8
Level 80
Jan 8, 2024
It's really not, and it really should.
MelvinHaze
+1
Level 56
Dec 31, 2025
Only if 'controversy' means 'there's a group of shouty people who refuse to accept what's right in front of them, even if it costs them the Earth'.
BichoRojo
+1
Level 29
Apr 7, 2024
I really enjoyed this one =D
DawnX
+2
Level 54
Aug 3, 2024
accept "Sagittarius A" for black hole in milky way
GeorgiaPeanut
+1
Level 71
Aug 3, 2024
Argh! Nitrogen oxide, nitric oxide, nitrogen dioxide, oxygen nitrate… I was all around that thing.
DelaBriQue
+1
Level 65
Aug 5, 2024
I know that “high […]” is the best word to use but isn’t it possible to accept “warm […]” or “hot […]”?
FirstPrism
+1
Level 48
Aug 7, 2024
I spelled "pituitary" "pituary" and thought that was the actual name of the gland. Pit-iful.
Hedgehog76
+1
Level 72
Aug 29, 2024
Could you accept "volcanic" for "igneous" or at least "magmatic"?
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