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By which material metre (line standard) bar is made of?

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By which material metre (line standard) bar is made of?

(a) Bronze

(b) Platinum

(c) Platinum-bronze alloy

(d) Platinum-iridium alloy

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The question is from Line Standard topic in portion Standards of Measurements of Engineering Metrology

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The correct option is (d) Platinum-iridium alloy

Explanation: Yard is made up of bronze bar. This bar is made of platinum-iridium alloy in which 90% is platinum and 10% iridium. Meter is the distance between two lines which are engraved on a bar surface.

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