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Question

Which out of these cannot be used to measure length precisely?

A
Metre scale
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B
Handspan
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C
Metric ruler
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D
Measuring tape
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Solution

The correct option is B Handspan
Handspan is an ancient unit of measurement defined as the maximum distance between the tips of the thumb and the little finger. But, since everybody's hands and fingers are different, no two handspans could be the same. This makes it difficult to use the unit as it is highly variable and unprecise.

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