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International Scientific Units Quiz

Based on the abbreviation, name the unit or prefix.
Litres are not an SI unit
http://en.wikipedia.org/wiki/International_System_of_Units
Quiz by Quizmaster
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First submittedJanuary 22, 2012
Last updatedOctober 21, 2016
Times taken31,721
Rating4.59
6:00
Enter unit or prefix here:
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 / 49 guessed
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Base Units
m
Metre
kg
Kilogram
s
Second
A
Ampere
K
Kelvin
mol
Mole
cd
Candela
Derived Units
rad
Radian
sr
Steradian
Hz
Hertz
N
Newton
Pa
Pascal
J
Joule
W
Watt
C
Coulomb
V
Volt
F
Farad
Ω
Ohm
Derived Units
S
Siemens
Wb
Weber
T
Tesla
H
Henry
°C
Degree Celsius
lm
Lumen
lx
Lux
Bq
Becquerel
Gy
Gray
Sv
Sievert
kat
Katal
Prefixes
Y
Yotta
Z
Zetta
E
Exa
P
Peta
T
Tera
G
Giga
M
Mega
k
Kilo
h
Hecto
da
Deca
Prefixes
d
Deci
c
Centi
m
Milli
µ
Micro
n
Nano
p
Pico
f
Femto
a
Atto
z
Zepto
y
Yocto
+4
level 84
Aug 4, 2014
I knew Becquerel; I just couldn't spell it.
+1
level 57
Jan 29, 2018
it took me so many tries
+4
level 77
Aug 4, 2014
I have never heard of the katal... which is telling since I'm a physicist. It seems to be a recent unit (added in the SI in 1999) for catalysts in chemistry but I bet very few people know that one.
+3
level 73
Jul 20, 2018
Heck, I'm a postgrad in chemistry with a focus in catalysis, and I've never heard of katal... We use turnover numbers or turnover frequencies to measure catalytic activity. (Also yes I know I'm replying to a 4 year old comment. So what?)
+1
level 59
Aug 22, 2014
I didn't get atto, because I spelled it ato and had no idea what it could be in English. Oh well.
+3
level 47
Aug 22, 2014
nice to see a quiz that the chat is actually intelligent and not someone arguing.
+1
level 76
Aug 22, 2014
Liters are not an SI unit? Then why is one liter of water 1 kg at normal Earth gravity?
+4
level 66
Aug 22, 2014
You got pretty mixed up. First: 1L of water is 1kg anywhere, because mass doesn't depend on gravity. And second: a liter is 1 cubic decimeter, the base unit is the meter. It could appear as a derived unit, the quizmaster just didn't feel like it
+3
level 71
Jul 16, 2016
In SI terms it's "litre" and "metre"...as is the spelling and pronunciation of Aluminium
+1
level 76
Aug 31, 2014
Okay. Haven't been to Physics class in a while.
+1
level 76
Jul 20, 2018
Get back to me when you learn how to construct a sentence in English.
+1
level 77
Oct 16, 2014
The meter has been defined as a ten millionth of an half meridian (which is why the circumference of the earth is so close to 40000km...). Then the kg has been defined as the mass of a liter (= cubic decimeter) of water at ambient temperature. Note that gravity has no incidence on that definition, but temperature has: density varies according to temperature, this is what is called thermal expansion. These concepts were not mastered around 1800 when the units were defined, which is why a liter of water is not exactly one kilogram at 20°C. Since 1875, the exact definition of the kilogram is... the international prototype kept in Sèvres. It's frustrating that we have not been able to find something better since then but it's like that...
+1
level 77
Oct 16, 2014
On the other hand, the second has been given a precise and complex definition, based on the hyperfine quantum levels transitions of the atom of Cesium. Then, since the speed of light is a very precisely known physical constant, the meter is simply defined as the distance travelled by light in a 1/299,792,458 of a second.
+1
level 75
Sep 24, 2015
...in a vacuum. Also, between 1960 and 1983, a meter was defined as "1 650 763.73 wavelengths of the orange-red emission line in the electromagnetic spectrum of the krypton-86 atom in a vacuum."
+1
level 50
Aug 22, 2014
2:05 left. Challenging, thanks!
+1
level 76
Aug 22, 2014
It's my own fault but, when Amp didn't work I didn't bother trying Ampere. I always use the abbreviation.
+1
level 63
Aug 23, 2014
Please can you accept amp for ampere, it's commonly referred to as just an amp.
+1
level ∞
Aug 23, 2014
Okay
+1
level 54
Dec 11, 2018
Really??? I dont think abbreviations should be allowed. Then you should accept sec and gig newt etc. The question is where do these letters stand for, not what do these letters stand for, that stands for the correct names. (If you get what I mean)
+2
level 56
Apr 15, 2019
amp is a very common abbreviation that most people know ampere by.
+1
level 66
Jun 3, 2015
I'm curious; what is a steradian used to measure?
+1
level 45
Jul 24, 2015
I'm not sure but i hope a weber has something to do with grilling.
+3
level 58
Sep 1, 2016
Solid angles
+2
level 45
Oct 21, 2016
Accept 'mili' for 'milli'?
+1
level 72
Oct 21, 2016
Surely the base unit should be the gram and the kilogram should be the derived unit. Otherwise they should have called the kg the gram, the gram the milligram, etc
+1
level 59
Oct 21, 2016
Nope, the quiz is right. It's confusing, I know. The way this happened is even more confusing and convoluted.
+1
level 72
Jan 20, 2017
I'm sure it is right, I just meant it seems odd that they worded it that way
+2
level 40
Jan 20, 2017
If you make the trip you can go and see The Kilogram(IPK) on display in France(or at least one of the sister IPKs)
+1
level 71
Feb 1, 2017
There's a c in Becquerel! Argh! Then I started doubting myself and tried Bechemel instead
+2
level 51
Feb 26, 2017
Definitely not a quiz in my wheel house as I thought SI was Sports Illustrated.
+1
level 57
Jun 24, 2017
Kilogram is scheduled for not being a basic unit anymore. It will be a derived unit from Plank's constant and the Second (thud the speed of light and the meter). You will be taking weight and time measurements with a tricorder soon.
+4
level 76
Sep 20, 2017
Atto? Zepto? Yocto? Aren't these Marx brothers?
+1
level 58
Nov 8, 2017
I was going to post that. You beat me to it!
+1
level 33
Dec 5, 2017
And I learned yocto before any of the other ones below millionths...
+1
level 33
Dec 5, 2017
And you can do something like, oh a gigameter
+1
level 49
Dec 9, 2017
Why doesn't mu work for µ? That's what it stands for in physics.
+2
level 56
Dec 22, 2017
That's the actual Greek letter and it isn't a Prefix I think.
+1
level 49
Dec 16, 2017
Are radians used to messure radioactivity, because sieverts do too. Tell me if i am wrong(i am not the smartest here;)
+1
level 56
Aug 17, 2018
No, radians are used to measure angles. There are π radians in 180°, so one radian equates to 180°/π = approx. 57.3°.
+1
level 27
Jul 19, 2018
Can you please accept deka for deca?
+1
level 65
Oct 25, 2018
And can you accept Herz for Hertz? My spelling's not too great.
+1
level 54
Dec 11, 2018
Never heard of sievert and katal (or most of the outer prefixes except iota and got zeta) Spend way too much time typing becquerel.. I knew it had the u, tried different amounts of r and l, maybe even tried the c, but not cq. Actually sievert is starting to come back..there was this cartoon called seabert about a seal stopping bad guys... I think there is a link in my memory there
+1
level 54
Dec 20, 2018
retook it and allready forgot a lot ! *shame* anyone else try fahrad instead of farad>? Oops ! (not accepted unfortunally...)
+1
level 42
May 30, 2019
tried faradays constant for the A, but got farad instead!
+1
level 53
Jan 24, 2019
You forgot feet
+2
level 27
Jan 31, 2019
The quizz is called scientific units not units used in ancient times(and USA).
+1
level 55
May 7, 2019
The imperial system is still widely used in the United Kingdom, as well as in the US, Belize and Burma. It was also widely used throughout the Commonwealth until a few decades ago. So not really ancient.
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