A sealed sensor floats in a concentrated sugar solution. The sensor's average density is lower than the density of water. Some of the solution is replaced by water and the mixture is stirred. The final liquid has a lower density than the original solution. What happens to the sensor when it comes to rest?
It is more deeply submerged, and the upthrust on it is unchanged
It is less deeply submerged, and the upthrust on it is unchanged
It is more deeply submerged, and the upthrust on it is decreased
It is submerged by the same amount, and the upthrust on it is decreased
108 exam-style questions on AQA GCSE Physics 5.5 Pressure and pressure differences in fluids, covering 5.5.1 Pressure in a fluid and 5.5.2 Atmospheric pressure. Each one has a worked solution and a mark scheme showing where the marks go.