In case of error, the zero mark of the scale does not coincide with one of the ends of the object that is being measured.
A
parallax
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B
zero
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C
instrumental
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Solution
The correct option is B zero When the measuring instrument has damaged ends, it may result in a measurement error. This is known as zero error. Therefore, when the zero mark of the scale does not coincide with the end of the object, zero error occurs.