alleryThe standard kilogram from 1889 to 2019 was a cylinder of which metal pair?
AGold and silver
BCopper and tin
CPlatinum and iridium
DIron and nickel
Answer & Solution
Correct answer: C. Platinum and iridium
1. In 1889 an artefact called the International Prototype of the Kilogram became the standard.
2. It was a cylinder made of platinum and iridium.
3. The other metal pairs were not used for it.
_Source: Wikipedia, Kilogram, Lead section_
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