Gce Model Questions Vol1 2025 Physics Question 7

Practice essay / theory question 7 from the 2025 Gce Model Questions Vol1 Physics examination. This question covers pressure, fluid_mechanics, ideal_gas_law .

Gce Model Questions Vol1 2025 Physics Essay / Theory
Topics: pressure fluid_mechanics ideal_gas_law
Question 7 GCE_MODEL_QUESTIONS_VOL1 • 2025 • PHYSICS • essay

A sealed cylindrical container of volume 2.0 L holds an unknown gas at 300 K. The container is connected at its base to a U‑tube manometer containing mercury (density = 13 600 kg m⁻³). The left leg of the manometer is open to the atmosphere (pressure = 101.3 kPa) and the right leg is connected to the container. The mercury levels differ by 15.0 cm, the mercury being higher in the leg attached to the container. Inside the container a vertical water column (density = 1000 kg m⁻³) of height 0.40 m rests on the bottom, so the gas occupies the space above the water. Using the diagram provided, answer the following:

Question Parts

( a )
Determine the absolute pressure of the gas in the container (in kPa, to one decimal place).
( b )
Assuming the gas behaves as an ideal gas, calculate the number of moles of gas present in the container (to three significant figures).
( c )
The temperature of the gas is raised to 350 K while the container volume and water column remain unchanged. (i) Calculate the new absolute pressure of the gas (kPa, to one decimal place). (ii) Determine the new height difference of the mercury columns in the manometer (cm, to one decimal place).
( ) Calculate the new absolute pressure of the gas.
( ) Determine the new mercury height difference in the manometer.
( d )
Explain qualitatively how the presence of the water column affects the pressure reading on the manometer compared with a direct connection to the gas (i.e., if the water column were absent).

Detailed Solution & Marking Scheme

Get the step-by-step solution, key points required by examiners and detailed marking guidance through the Edcrib AI Tutor.

Reveal Answer

About This Question

This is Gce Model Questions Vol1 2025 Physics Question 7. It is one of the essay questions from the 2025 Gce Model Questions Vol1 Physics examination.

The question covers pressure, fluid_mechanics, ideal_gas_law .

View More Gce Model Questions Vol1 2025 Physics Questions More Gce Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support