What type of error is introduced when an observer consistently reads a scale from an angle instead of directly in front?
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A.
Random error
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B.
Instrumental error
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C.
Parallax error
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D.
Gross error
Correct Answer:
C. Parallax error
Explanation:
When a measurement is taken by looking at a scale from an incorrect angle rather than straight on, it results in a parallax error. This type of error occurs because the observer's line of sight is not perpendicular to the scale, causing the pointer or mark to appear at a different position than its actual value. Since this discrepancy happens consistently whenever the observer maintains that specific viewing angle, it is classified as a systematic error rather than a random one. To prevent parallax errors, measurements should always be read with the eye positioned directly in front of and level with the measurement mark.
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