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प्रश्न
What object and material were used to define the kilogram for 130 years before 2019?
विकल्प
Water in a glass tube
Carbon-12 atom
Metal cylinder of platinum-iridium
Light wave from a laser
MCQ
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उत्तर
Metal cylinder of platinum-iridium
Reason:
The International Prototype of the Kilogram (IPK) was made of a highly stable platinum-iridium alloy due to its resistance to oxidation and corrosion.
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