ull,{"backHref":"/gcse/physics/edexcel/questions","basePath":"/gcse/physics/edexcel/pressure-in-fluids-and-upthrust/questions","formulaUrl":null,"initialIndex":71,"initialQuestionWindow":[{"id":"6acafe01-5fef-4921-9756-574560382df3","revisionId":"36436a2f-9651-4cc2-9292-19709f47f593","questionNumber":null,"questionType":"LA","specification":"Figure 1 shows how the density of Venus's atmosphere changes with altitude above the surface.\n\n![Figure 1](https://assets.mathsgenie.co.uk/aqa-qb/f81fb375-1d97-4d69-a384-065db67bd981.png)\n\n| Altitude above surface in km | Atmospheric density in $\\text{kg/m}^3$ |\n| :---: | :---: |\n| 0 | 65.0 |\n| 10 | 38.0 |\n| 20 | 20.0 |\n| 30 | 9.5 |\n| 40 | 4.0 |","difficulty":4,"difficultyBand":"medium","totalMarks":3,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"1ad4ef86-718a-4d3a-99fd-6c7b9f1f2f88","label":null,"content":"Describe how the atmospheric density of Venus changes with altitude above the surface.\n\nUse data from Figure 1 to support your answer.","markscheme":"- States that as altitude increases, atmospheric density decreases (or vice versa) M1\n- Explains that the decrease is non-linear (i.e. it decreases more rapidly at lower altitudes and more slowly at higher altitudes, or the curve gets flatter) M1\n- Uses data points from the table or graph to support the non-linear relationship (e.g. from $0$ to $10\\text{ km}$, density decreases by $27.0\\text{ kg/m}^3$, whereas from $30$ to $40\\text{ km}$, it only decreases by $5.5\\text{ kg/m}^3$) A1","marks":3,"order":0,"markingRubric":null,"explanation":{"methods":[{"id":"describe_trend","label":"Describe the trend","steps":[{"type":"text","order":0,"title":"State the overall trend","content":"Read the axes first: altitude is on the horizontal axis and atmospheric density is on the vertical axis. As altitude above Venus’s surface increases, the atmospheric density **decreases**. This clear overall comparison earns **M1**.","highlights":[{"text":"Describe how the atmospheric density of Venus changes with altitude above the surface.","location":"specification"}]},{"type":"text","order":1,"title":"Identify the curve shape","content":"The graph is not a straight line: it is steep at low altitude and then becomes flatter. Therefore the density decreases **non-linearly** — it falls more rapidly at lower altitudes and more slowly at higher altitudes. This earns the second **M1**.","highlights":[{"text":"Figure 1 shows how the density of Venus's atmosphere changes with altitude above the surface.","location":"specification"}]},{"type":"hyper_latex","block":{"nodes":[{"latex":"\\text{0 to 10 km:}\\quad 65.0-38.0=27.0\\ \\mathrm{kg/m^3}"},{"latex":"\\text{30 to 40 km:}\\quad 9.5-4.0=5.5\\ \\mathrm{kg/m^3}"}]},"order":2,"title":"Compare equal altitude intervals","description":"Compare two equal 10 km altitude intervals. The much smaller second decrease shows that the rate of decrease is changing. A1: these two data comparisons support the non-linear relationship."}]}],"generatedAt":"2026-07-22T09:37:44.444Z","modelVersion":"gpt-5.6-terra+diagrams-1","explanationVersion":"v3"},"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"74b66dbd-280f-41da-a3ec-d343e51fad61","revisionId":"1590f6f0-7981-471c-b57e-6d3b8946fc0c","questionNumber":null,"questionType":"LA","specification":"A sealed, flexible packet of snacks is packed at sea level.\n\nA climber carries the sealed packet in their backpack to the summit of a high mountain.","difficulty":5,"difficultyBand":"medium","totalMarks":3,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"1f425e39-57a7-4dc4-8528-d74d2d7692f7","label":null,"content":"Explain what happens to the volume of the packet as the climber climbs to the summit of the mountain.","markscheme":"- States that the volume of the packet increases (or the packet expands / inflates) B1\n- States that the atmospheric (external) pressure decreases as altitude increases B1\n- Explains that the pressure inside the packe

Pressure in fluids and upthrust

Question 11

Pressure in fluids and upthrust Questions

Pressure in fluids and upthrust

Question 11

Pressure in fluids and upthrust Questions