May/June 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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13Upthrust BuoyancyHard1 mark
A hydrometer is a device for measuring the density of liquids. It consists of a weighted bulb at the bottom of a calibrated tube.
a hydrometer: a narrow calibrated tube of length h stands above the liquid surface, connected down to a wider weighted bulb submerged in the liquid; h is marked as the length of tube between the liquid surface and the top of the tube
The hydrometer is floating in a liquid at room temperature. The length of the tube above the level of the liquid is h. Which change causes h to decrease?