Which of the following is the smallest unit of length?

nanometer
yoctometre
picometre
femtometre
Yocto is a unit prefix in the metric system denoting a factor of 10−24 or 0.000000000000000000000001. It was adopted in 1991 by the General Conference on Weights and Measures. It comes from the Latin/Greek octo (οκτώ), meaning "eight", because it is equal to 1000−8. Yocto- is the smallest official SI prefix.
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Answers by country

nanometer
yoctometre
picometre
femtometre
answers
flagthe Netherlands
0%
91%
0%
8%
12
flagAustralia
20%
58%
12%
8%
24
flagIndia
17%
50%
15%
16%
114
flagGreece
42%
50%
7%
0%
14
flagthe United States
20%
43%
18%
18%
60
flagGermany
23%
32%
21%
22%
94
flagPoland
26%
31%
23%
18%
1469
flagAustria
45%
29%
8%
16%
24
flagthe United Kingdom
42%
21%
18%
18%
38
flagNigeria
17%
17%
41%
23%
17
flagPakistan
70%
10%
10%
10%
10