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The bar used for defining the standard metre at the International office of weights and measures at Sevres near Paris, is composed of

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The bar used for defining the standard metre at the International office of weights and measures at Sevres near Paris, is composed of Answer: 90% platinum and 10% iridium

Question context

This question is part of 🚧 Civil Engineering within the broader 🛠️ Engineering Essentials subject and appears in the DemoPaper-Pakistan preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.