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प्रश्न
How is the standard metre defined?
पर्याय
The distance light travels in 1 sec
The gap between the two lines on a metal bar in Paris
Part of Earth’s diameter
Length of a pendulum
MCQ
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उत्तर
The gap between the two lines on a metal bar in Paris
Explanation:
The metre was defined as the distance between two marks on a special metal bar kept in Paris.
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