plumiIdeal gases and the gas laws: OCR A‑Level Physics B questions
OCR A-Level Physics B past-paper questions on 5.2.1.2 Ideal gases and the gas laws, 2016–2025, with mark schemes and examiner’s reports where available.
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All 25 questions on Ideal gases and the gas laws, as a list
- June 2025, Paper 1, Q19 (1 mark): What is the new value of the absolute temperature? A T B 3T C 6T D 9T Your answer [1]
- June 2025, Paper 2, Q6(a)(i) (4 marks): Explain why it is necessary to keep the temperature of the air constant during the demonstration. Use ideas from kinetic theory to explain the effect of the tem
- June 2025, Paper 2, Q6(c)(i) (2 marks): Explain why this is equivalent to 0.2 Pa–1 m–3. [2]
- June 2025, Paper 2, Q6(c)(ii) (3 marks): Use the value in (c)(i) to calculate the number of moles of trapped air in the tube. number = mol [3]
- June 2024, Paper 1, Q38(a)(i) (2 marks): Show that the mass of the person is about 61 kg. [2]
- June 2024, Paper 1, Q38(a)(ii) (2 marks): At the end of the day the temperature is 30 °C and the same person sits on the chair. Calculate the length l of the cylinder at the end of the day, when a perso
- June 2024, Paper 1, Q38(b)(ii) (3 marks): Use the graph to calculate a value of absolute zero of temperature. absolute zero of temperature = °C [3]
- June 2023, Paper 2, Q2(c) (3 marks): The barrel has a uniform radius of 0.05 m. When the compressed gas is released the pressure on the left side of the T-shirt is 4.0 × 104 Pa greater than atmosph
- June 2023, Paper 2, Q3(a) (2 marks): Draw graphs on Fig. 3.2a and Fig. 3.2b showing how the pressure P of the gas varies with the volume V and how the pressure varies with 1 V. Assume that the temp
- June 2023, Paper 2, Q3(c)(ii) (3 marks): Describe and explain how the behaviour of the gas would change if the gas were compressed more quickly. You may use equations and refer to your graphs in Fig. 3
- June 2022, Paper 1, Q15 (1 mark): Which relationship can be correctly represented by the graph shown? y 0 x 0 x axis y axis mass of gas in a constant volume at A pressure constant temperature pr
- June 2022, Paper 1, Q38(a) (6 marks): This question is about the relationship between the volume V of a fixed mass of gas at constant pressure and the absolute temperature T of the gas. The relation
- June 2022, Paper 1, Q38(b)(i) (3 marks): Use the data given to show that length L is approximately 1.2 m. Assume ideal gas behaviour. Explain your reasoning. Explanation: [3]
- June 2022, Paper 3, Q2(a)(i) (1 mark): Identify a variable which needs to be controlled in the investigation. [1]
- June 2022, Paper 3, Q2(b) (2 marks): The pressure gauge used in the experiment records excess pressure. The absolute pressure of the gas is given by absolute pressure = excess pressure + atmospheri
- June 2022, Paper 3, Q2(c) (6 marks): This question is about an investigation into the relationship between the pressure and volume of a gas. The relationship is often referred to as Boyle’s Law. A
- November 2021, Paper 1, Q40(a)(i) (2 marks): Write in the box below each graph of Fig. 40 the proportionality relationship shown. [2]
- November 2021, Paper 1, Q40(a)(ii) (1 mark): Combine all the proportionality relationships into one equation using the Boltzmann constant k. [1]
- November 2021, Paper 1, Q40(a)(iii) (1 mark): For one mole of gas at standard temperature and pressure (STP): T = 273 K P = 101 kPa V = 22.4 litres. Calculate the value of the Boltzmann constant to 3 signif
- November 2020, Paper 1, Q32(a) (2 marks): Calculate the number of moles of air in one tyre. number of moles = [2]
- November 2020, Paper 1, Q32(b) (3 marks): During driving, the tyres warm to 47 °C and the volume remains constant. Using ideas from kinetic theory, explain what happens to the air pressure in the tyres.
- June 2019, Paper 1, Q18 (1 mark): A fixed mass of gas occupies a volume V. The temperature of the gas is increased so that the mean square speed of the molecules is doubled. What is the new volu
- June 2019, Paper 1, Q37(c)(i) (3 marks): The density of the bead of solid 2H and 3H (1:1 ratio by atoms) is 230 kg m−3. Estimate the energy needed to produce plasma at 400 MK from this bead of material
- June 2018, Paper 1, Q39(a) (6 marks): 39 (a)* Boyle’s Law states that at constant temperature, pressure is proportional to volume. Explain how the random motion of particles gives rise to Boyle’s la
- June 2017, Paper 2, Q1(c) (2 marks): The velocity of sound in air v is given by the equation v where p is the pressure of = t the gas, t is the density of the gas and k is a constant. m Use the exp
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