The mass of Platinum cylinder kept near Paris is________?
Correct answer: B. 1 Kg
- A. 1 gram
- B. 1 Kg
- C. 100 Kg
- D. None
Explanation
The platinum-iridium cylinder kept near Paris was the historical international prototype of the kilogram, so its standard mass was 1 kg. The likely mistake is choosing 1 gram by confusing the prototype with a small laboratory mass. The topic list has no measurement or SI-units category, so this topic assignment is only an approximate fit.
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