Four students measure the height of a tower. Each student uses a different method and each measures the height many different times. The data for each are plotted below. The measurement with highest precision is
A$I$
B$II$
C$III$
D$IV$
KVPY 2011, Diffcult
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A$I$
a (a)
Precision refers to the limit of resolution. Precision is determined by the least count of measuring instrument.
A smaller least count means greater precision.
So, more precise readings have least spread of readings as in case $I$.
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