ull,{"backHref":"/gcse/physics/edexcel/questions","basePath":"/gcse/physics/edexcel/pressure-in-fluids-and-upthrust/questions","formulaUrl":null,"initialIndex":20,"initialQuestionWindow":[{"id":"138a9c5b-83d7-4e12-bce0-cba13c0793a1","revisionId":"aeec3f43-9a5a-4e52-8a8a-c4c8e102fc48","questionNumber":null,"questionType":"LA","specification":"","difficulty":6,"difficultyBand":"medium","totalMarks":2,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"7de940a5-c3b5-4c99-999b-a82778802b50","label":null,"content":"Explain why there is an upthrust acting on a sealed metal cylinder submerged in a tank of cooking oil.","markscheme":"- States that pressure increases with depth ($P = h \\rho g$), so the pressure at the bottom of the cylinder is greater than the pressure at the top B1\n- Explains that since $F = P \\times A$, this pressure difference creates a larger upward force on the bottom than the downward force on the top, resulting in a net upward force (upthrust) B1","marks":2,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"21a97ad2-0965-40e2-91fc-a32da8bce571","revisionId":"71b1f809-3777-46e3-96a6-f9c35cd2a3d2","questionNumber":null,"questionType":"LA","specification":"Figure 1 shows how atmospheric pressure changes with height above sea level.\n\n![Figure 1: A line graph showing atmospheric pressure in millibars (mb) on the vertical y-axis against height above sea level in kilometres (km) on the horizontal x-axis. The y-axis ranges from 0 to 1000 mb with gridlines every 100 mb. The x-axis ranges from 0 to 30 km with gridlines every 5 km. The curve starts at (0, 1000), goes down to (5, 500), then to (10, 250), (20, 50), and approaches near 0 at 30 km.](https://assets.mathsgenie.co.uk/aqa-qb/d3a218e8-1f0e-4f47-9ca7-e08b89853a8a.png)","difficulty":4,"difficultyBand":"medium","totalMarks":3,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"a89f1a13-e4c0-4c1b-83f5-90ef693a3d01","label":null,"content":"Describe how atmospheric pressure changes with height above sea level.\n\nUse data from Figure 1 to support your answer.","markscheme":"- States that atmospheric pressure decreases as height above sea level increases B1\n- Identifies that the relationship is non-linear (e.g., the rate of decrease is faster at lower altitudes and then levels off / decreases more slowly) B1\n- Uses data from Figure 1 to support the description (e.g., states that pressure decreases by $500\\text{ mb}$ in the first $5\\text{ km}$ from $1000\\text{ mb}$ to $500\\text{ mb}$, or compares values at two specific heights such as $1000\\text{ mb}$ at $0\\text{ km}$ and $250\\text{ mb}$ at $10\\text{ km}$) B1","marks":3,"order":0,"markingRubric":null,"explanation":{"methods":[{"id":"read_graph","label":"Read and describe the graph","steps":[{"type":"text","order":0,"title":"State the overall trend","content":"Atmospheric pressure decreases as height above sea level increases. This earns **B1** for describing the overall trend.","highlights":[{"text":"Describe how atmospheric pressure changes with height above sea level.","location":"specification"}]},{"type":"text","order":1,"title":"Explain the changing rate","content":"The relationship is non-linear: the curve is steep at low heights, so pressure decreases quickly at first, then becomes flatter at greater heights, so it decreases more slowly. This earns **B1** for describing the changing rate of decrease.","highlights":[{"text":"Describe how atmospheric pressure changes with height above sea level.","location":"specification"}]},{"type":"text","order":2,"title":"Use accurate data","content":"Read two values directly from Figure 1: atmospheric pressure is $1000\\,\\text{mb}$ at $0\\,\\text{km}$ and $500\\,\\text{mb}$ at $5\\,\\text{km}$. These readings support the description and earn the final B1 mark.","highlights":[{"text":"Use data from Figure 1 to support your answer.","location":"specification"}]}]}],"generatedAt":"2026-07-22T11:59:

Pressure in fluids and upthrust

Question 3

Pressure in fluids and upthrust Questions

Pressure in fluids and upthrust

Question 3

Pressure in fluids and upthrust Questions