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Why must the pencil be held at a fixed full arm's length during visual measurement?

Answer and explanation

Correct answer: To maintain the same visual scale in every comparison

The governing concept is consistent sighting measurement. A pencil held at a fixed full arm's length becomes a stable reference scale; changing its distance changes its apparent size and can make the same object seem to measure differently. Keeping one eye closed and comparing the object with the pencil from the same position makes every width or height comparison reliable. Therefore option B is correct; the other choices concern appearance, shadows, or paper position, not measurement accuracy.

Related tags

Sighting MethodVisual ScaleMeasurementObject ObservationDrawing BasicsArt EducationClass 9 Mcq

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