Question detail
During a practical, you record the mass of a solid as 0.256 kg and the volume as 0.0320 m³. Which statement best describes the significance of the recorded figures (Density of materials)
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Changes of state and the particle model
Question
- A. The mass is more significant because it has fewer decimal places
- B. The volume is more significant because it has more decimal places
- C. Both figures have the same number of significant figures and are equally significant
- D. The mass is more significant because it has more decimal places
Answer
The correct answer is Both figures have the same number of significant figures and are equally significant.
Explanation
Boundary lens: Keep this separate from nearby specification points that use similar words but test a different idea. This question asks: During a practical, you record the mass of a solid as 0.256 kg and the volume as 0.0320 m³. Which statement best describes the significance of the recorded figures (Density of materials). The correct response is Both figures have the same number of significant figures and are equally significant, because density links mass and volume, so the answer must preserve which quantity is being calculated. In Density of materials, the marking point should connect directly to apply AT 1 and AT 3 skills when measuring mass and volume. If the question includes values, the working must keep the appropriate unit and operation; if it is an explanation, it must name the relevant particle behaviour or energy change. This item belongs to Changes of state and the particle model, so avoid answers that switch to a different quantity, confuse heat with temperature, or describe gas pressure without collisions when collisions are the reason. Checkpoint 94 is distinct because it uses this exact question context and the boundary lens rather than a generic particle-model sentence.
Common mistake
Confusing Mass and Weight
Students often confuse mass (measured in kg) with weight (measured in N), leading to incorrect calculations when determining density.
Remember that mass is a measure of the amount of matter in an object, while weight is the force acting on that mass due to gravity. Always use mass in kilograms when calculating density.
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