Physics · May / June 2020 · Paper 11 · Question 15

The diagram shows a mercury manometer. The tube is open to the atmosphere on the right-hand side. The left-hand side is connected to a container containing a gas at pressure P. Atmospheric pressure on its own supports a column of mercury of height 756 mm. Which height of column does pressure P on its own support?

1. A676 mm of mercury
2. B696 mm of mercury
3. C816 mm of mercury
4. D836 mm of mercury

As printed in the paper