Quick answer: Gas pressure is caused by particles colliding with the walls of their container. This Physics 9-10 test on kinetic theory of gases has 8 questions worth 20 marks, to do in 45 minutes: temperature scale, how gas creates pressure and pump. The mark scheme is on a separate page; free printable PDF.
This physics grades 9-10 test on kinetic theory of gases test works like a real class test. The mark scheme is on a separate page, so revise with the lesson first.
Answer all questions in the spaces provided. Show your working and include units. Use T = θ + 273 and assume the gas does not leak. A calculator is allowed. The test is out of 20 marks.
Level: Physics grades 9-10 (GCSE · IGCSE · O Level · Class 9-10) · Curriculum: IGCSE 2.1, HS-PS3-2
Kinetic theory of gases test: the test questions
Question 1 Temperature scale (2 marks)
- State the value of absolute zero in °C. (1 mark)
- Convert 37 °C to kelvin. (1 mark)
Question 2 How gas creates pressure (3 marks)
Explain, using the kinetic theory, how a gas exerts pressure on the walls of its container. (3 marks)Question 3 Pump (3 marks)
A pump holds 250 cm³ of air at 100 kPa. All of it is pushed into a container of volume 40 cm³ at constant temperature. Calculate the pressure. (3 marks)Question 4 Syringe and gauge (4 marks)
- Calculate p × V for the trapped air. (1 mark)
- The plunger is pushed slowly to 18 cm³. Calculate the new gauge reading. (2 marks)
- Name the quantity that must stay constant for your calculation to be valid. (1 mark)
Question 5 Heating a cylinder (3 marks)
A sealed rigid cylinder contains gas at 200 kPa and 15 °C. Calculate the pressure at 75 °C. (3 marks)Question 6 Pressure rise on heating (2 marks)
Explain why heating a gas in a rigid container raises the pressure. (2 marks)Question 7 Lowest temperature (2 marks)
Explain why no object can be cooled below −273 °C. (2 marks)Question 8 Condition for Boyle’s law (1 mark)
State one condition needed for p × V to be constant for a gas. (1 mark)
