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Where should the zero mark be placed while measuring length with a ruler?

Answer and explanation

Correct answer: At the starting end of the object

A ruler measures the distance between two points. To measure an object correctly, its starting end should be placed at the ruler's zero mark, while the other end is read on the scale. The ruler should lie straight along the object, and the eye should be directly above the mark to avoid parallax error. These steps make the reading more dependable.

Thus, the zero mark must coincide with the object's starting end, so option B is correct. If the object cannot be placed at zero because the ruler is damaged, another clear mark may be used as a starting reference, and the difference between the two readings is calculated. However, among the given choices, placing zero at the starting end is the standard and simplest method.

Related tags

RulerZero-MarkLengthAccuracyScientific Questions And ObservationsExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScience

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