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What happens if the arm extension changes each time while measuring proportion with a pencil?

Answer and explanation

Correct answer: Measurements will become inconsistent

The governing concept is consistent sight-based measurement. A pencil measurement depends on the fixed viewing distance and the angle of the extended arm. If the arm extension changes from one observation to the next, the apparent scale on the pencil changes, so comparisons are no longer reliable. Option B is correct. This variation does not sharpen the object, darken colours, or reduce the cast shadow.

Related tags

Object ObservationArm LengthPencil MeasurementConsistencyDrawing BasicsArt EducationClass 9 Mcq

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