Physics · May / June 2022 · Paper 12 · Question 12

A manometer contains mercury of density 14 000 kg / m³. The manometer is connected to a gas supply and the difference in the height of the mercury levels is 72 mm. The atmospheric pressure is 100 kPa. The gravitational field strength g is 10 N / kg. [diagram of a manometer with mercury, height difference 72 mm, connected to gas supply] What is the pressure of the gas supply?

1. A90 kPa
2. B99 kPa
3. C110 kPa
4. D200 kPa

As printed in the paper