An open reservoir contains water. A pressure sensor is fixed to its vertical wall below the water surface. Water is removed slowly, so the surface falls but remains above the sensor.
How does the pressure due to the liquid at the sensor change as the water is removed?
It increases because water is being removed from the reservoir.
It decreases because the water becomes less dense as its level falls.
It decreases because the column of water above the sensor becomes shorter.
It remains unchanged because the sensor stays at the same position.
132 exam-style questions on Edexcel GCSE Physics 15.2 Pressure in fluids, covering 15.2.1 Atmospheric pressure and height, 15.2.2 Pressure in fluids, 15.2.3 Pressure, force and area, 15.2.4 Pressure and depth, 15.2.5 Pressure in liquids: depth and density, 15.2.6 Upthrust, and 15.2.7 Floating and sinking. Each one has a worked solution and a mark scheme showing where the marks go.