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Difficult Science and Maths A-Z

Answering one question tells you which answer requires the next letter of the alphabet. How many can you get? All questions can be answered without the letter hint (albeit with great difficulty)!
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TheHelloWorld
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Last updated: May 28, 2025
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First submittedMay 28, 2025
Times taken100
Average score30.8%
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Letter
Hint
Answer
B
Taxonomic kingdom with no unused sections of DNA
Bacteria
L
Internal space of a blood vessel
Lumen
A
Unit for the mean distance from Earth to Sun
Astronomical Unit
Q
Comes in up, down, charm, strange, top and bottom flavours
Quark
Y
Prefix denoting 10^24
Yotta
E
Carboxylic acid + alcohol -> _____ + water
Ester
V
Transition metal, the only element starting with this letter
Vanadium
K
4D construction made by joining the edges of two möbius strips together
Klein bottle
H
Protein found in erythrocytes
Haemoglobin
O
Platonic solid made from connecting the midpoints of the faces of a cube
Octahedron
G
Sugar which, along with glucose, makes up lactose
Galactose
I
Virus which attacks white blood cells
Human Immunodeficiency Virus
D
Famous function where all values are zero except at zero
Dirac delta function
P
The point of an astronomical orbit closest to the sun
Perihelion
U
Nitrogenous base found in ribonucleic acid but not deoxyribonucleic acid
Uracil
W
Fundamental force mediated by W and Z bosons
Weak nuclear force
N
Female German mathematician known for conservation laws and symmetries
Emmy Noether
S
Shape of the Earth
Oblate spheroid
C
Force responsible for spin and direction of hurricanes
Coriolis force
R
Process used in desalination of sea water
Reverse osmosis
F
SI unit of capacitance
Farad
T
The law that the entropy of the universe always increases over time
Second law of thermodynamics
J
New telescope primarily detecting infra-red light
James Webb Space Telescope
X
Type of plant adapted to dry conditions
Xerophytes
Z
Function used by Bernhard Riemann to investigate prime numbers
Zeta function
M
Subjective scale for measuring earthquake damage
Mercalli scale
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3 Comments
AntimatterYT
+1
Level 55
Jul 7, 2025
i thought 10^24 is septillion
TheHelloWorld
+1
Level 49
Jul 7, 2025
Yes, but the question asks for the prefix i.e. kilo, mega, giga, tera etc.
Gumbledalf
+1
Level 77
Jul 16, 2025
A Klein bottle (at least the manifold) is 2D, not 4D
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