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Which option gives a qualitative observation?

Answer and explanation

Correct answer: The rock surface is rough

The direct answer is A: the rock surface is rough. A qualitative observation describes a quality or property using words rather than a numerical measurement. “Rough” tells us about the texture of the surface, but it does not give a value with a unit. Option A is therefore correct. Option B is quantitative because mass is stated as 2 kg; it uses a number and a unit. Option C is quantitative because length is given as 50 cm. Option D is quantitative because volume is given as 100 mL. Qualitative observations may describe colour, texture, smell, shape, or appearance, while quantitative observations describe measurable amounts such as mass, length, time, temperature, or volume. The absence of a number does not make an observation unscientific; it simply makes it qualitative. Memory cue: quality means words; quantity means numbers and usually units.

Related tags

Qualitative-ObservationTextureRockDescriptionScientific Questions And ObservationsExploration: Entering The World Of Secondary ScienceExploration Entering The World Of Secondary ScienceScience

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