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प्रश्न
What material is used to make the standard of mass and length?
विकल्प
Steel alloy
Platinum-iridium alloy
Gold alloy
Copper-zinc alloy
MCQ
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उत्तर
Platinum-iridium alloy
Explanation:
Both the standard kilogram (cylinder) and the standard metre (bar) are made from a platinum-iridium alloy to ensure durability and stability.
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