Air at atmospheric pressure and room temperature is trapped in an insulated container by a frictionless piston of negligible weight. The air can be compressed by placing masses on top of the piston. [Figure showing a container with trapped air, a piston, and masses on top]. A mass of 1.0 kg is placed on the piston and the volume of the trapped air decreases from 100 cm³ to 90 cm³. Which statement is correct?
✓ Correct Answer
The correct answer is A: Adding another 1.0 kg mass decreases the volume of the air by less than 10 cm³.
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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