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

12

24

114

14

63

1483

99

24

39

17

10