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Why must the thumb-marked distance on the pencil remain fixed during visual measurement?

Answer and explanation

Correct answer: So that the unit of comparison does not change

The governing concept is comparative visual measurement. The distance between the pencil tip and the thumb acts as a temporary measuring unit for comparing the object’s height, width, or parts. If the thumb moves, the unit changes and every comparison becomes unreliable. Therefore option A is correct; the other choices concern the pencil, colour, or shadow and do not explain measurement accuracy.

Related tags

Object ObservationVisual MeasurementPencil MeasuringDrawing BasicsArt EducationClass 9 Mcq

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