Question detail
Which option best applies pressure difference for Pressure in liquids (physics only) in AQA GCSE Physics Forces?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Pressure and pressure differences in fluids (physics only)
Question
- A. The weight of the liquid above the object — graph focus for pressure difference
- B. This confuses force and pressure and does not answer Pressure in liquids (physics only).
- C. This is too vague because it does not use the force or motion quantity named in the objective.
- D. This reverses the physical cause and effect for Pressure and pressure differences in fluids (physics only).
Answer
The correct answer is: The weight of the liquid above the object — graph focus for pressure difference
Explanation
The correct option is The weight of the liquid above the object — graph focus for pressure difference. The weight of the liquid above the object — graph focus for pressure difference is correct because it matches the approved learning objective to (Physics only) Explain why pressure differences in a liquid produce an upwards force on submerged objects. This answer belongs to Pressure in liquids (physics only) within Pressure and pressure differences in fluids (physics only), so it must use precise AQA GCSE Physics forces and motion vocabulary. The other options are wrong because they either confuse force and pressure, omit the required force or motion condition, or move away from the exact subtopic being tested.
Common mistake
Understanding Upthrust
Students often confuse the concept of upthrust with the overall weight of the object, thinking that upthrust is simply the weight of the object in the fluid.
Clarify that upthrust is the upward force exerted by the fluid, which is equal to the weight of the fluid displaced by the submerged part of the object. Emphasize the relationship between pressure differences and the resultant force acting upwards. In Pressure in liquids (physics only), correct the mistake by naming the relevant force or motion quantity and checking force and pressure.
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