Which amongst these is a standard tool for measuring distance in recent times?
A
Span
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B
Metre scale
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C
Foot
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D
Cubit
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Solution
The correct option is B Metre scale Metre scale is the only standard tool for measuring distance as it can measure 1 metre - the path length travelled by light in a given time. Rest all units of measurements are non standard ones as they differ from person to person.