Which of the following can not be used to measure quantities accurately?

A metre scale.

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Length of foot.

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A weighing machine.

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A stop watch.

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Solution

The correct option is B Length of foot.
Metre scale is used to measure length accurately. SI unit of length is metre (m).
Weighing machine is used to measure mass accurately. SI unit of mass is kilogram (kg).
Stop watch is used to measure time accurately. SI unit of time is second (s).
While the length of foot can vary from person to person. So it will give variable measurement.

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