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Q.

The footstep is an unreliable measure of length because


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a

People do not measure properly with it

b

It varies from person to person

c

some people jump too much while measuring with the footstep

d

It is a standard unit of measurement  

answer is B.

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Detailed Solution

The footstep is an unreliable measure of length because it varies from person to person.
Because everyone's pace or footstep is different, the distances measured by two different people using their footsteps will not be the same. As a result, pace or footstep cannot be used as a standard unit of length.
 
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The footstep is an unreliable measure of length because