Concept:Parallax error is a consistent and repeatable measurement error caused by incorrect eye positioning while taking a reading.
Hence, it is classified as a systematic error.
Explanation:Parallax error occurs when the observer's eye is not placed perpendicular to the scale or measuring device.
This improper eye position causes the reading to appear shifted, leading to an incorrect observation of the object's position.
The error is predictable and repeatable, meaning the same wrong reading is obtained every time the same faulty technique is used.
Because it follows a fixed pattern and affects measurements consistently, it is classified as a systematic error.
Parallax error can be minimized by aligning the eye properly with the scale and using correct observation techniques.
It is different from random errors, which are unpredictable and vary with each measurement.
Gross errors are caused by mistakes such as wrong readings or careless instrument handling, which is not the case here.
Instrumental errors arise from defects or imperfections in the measuring instrument itself, not from the observer's technique.
Answer:Parallax error is an example of a systematic error.
Therefore, the correct option is C. Systematic error.