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Question

The international standards of weight and measures are made of:

A
gold silver alloys
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B
platinum - iridium alloys
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C
copper - gold alloys
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D
platinum - iron alloys
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Solution

The correct option is B platinum - iridium alloys
The addition of 10% iridium to the platinum greatly increases its hardness and so reduces wear.Hence the international standards of weight and measures are made up of platinum and iridium alloys.

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