Lesson 3.6.2.2

3.6.2.2 Ideal gases Quiz: AQA Physics, Unit 6

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.6.2.2, Ideal gases: 20 multiple choice questions for the AQA Physics (7408), Unit 6: Further mechanics and thermal physics (A-level only), written with Revision Ninja.

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The 20 questions

  1. What is the value of absolute zero in degrees Celsius?

    • -460 °C
    • 0 °C
    • -100 °C
    • -273 °C

  2. The ideal gas equation for n moles of gas is:

    • pV = nR / T
    • pT = nRV
    • p / V = nRT
    • pV = nRT

  3. In the ideal gas equation pV = NkT, what constant does k represent?

    • Boltzmann constant
    • Stefan constant
    • Avogadro constant
    • Molar gas constant

  4. The Boltzmann constant is related to the molar gas constant R and Avogadro constant N_A by:

    • k = R N_A
    • k = R / N_A
    • k = N_A / R
    • k = R^2 / N_A

  5. The work done by a gas expanding at constant pressure is:

    • W = p delta T
    • W = p delta V
    • W = p / delta V
    • W = nRT

  6. What is defined as the mass of one mole of a substance?

    • Molecular mass
    • Density
    • Molar mass
    • Atomic mass

  7. According to Boyle's law, how is pressure related to volume at constant temperature?

    • Inversely proportional
    • Independent of volume
    • Directly proportional
    • Equal to volume

  8. What quantity is directly proportional to volume according to Charles's law?

    • Absolute temperature
    • Density
    • Pressure
    • Number of moles

  9. 2.0 mol of ideal gas at 300 K occupies 0.050 m^3. What is its pressure?

    • about 1.0 x 10^3 Pa
    • about 1.0 x 10^5 Pa
    • about 4.0 x 10^5 Pa
    • about 2.5 x 10^4 Pa

  10. At 273 K and 1.01 x 10^5 Pa, what volume does 1.0 mol of ideal gas occupy?

    • about 2.2 x 10^-3 m^3
    • about 0.0022 m^3
    • about 0.022 m^3
    • about 0.22 m^3

  11. A sample contains 0.50 mol of gas. How many molecules does it contain? Take N_A = 6.0 x 10^23 mol^-1.

    • 1.2 x 10^24
    • 6.0 x 10^22
    • 3.0 x 10^23
    • 6.0 x 10^23

  12. A gas expands at constant pressure 2.0 x 10^5 Pa from 1.0 x 10^-3 m^3 to 3.0 x 10^-3 m^3. What work does it do?

    • 600 J
    • 800 J
    • 400 J
    • 200 J

  13. What is the average translational kinetic energy per molecule of an ideal gas at 300 K? Take k = 1.38 x 10^-23 J K^-1.

    • 1.0 x 10^-21 J
    • 6.2 x 10^-21 J
    • 4.1 x 10^-21 J
    • 2.1 x 10^-20 J

  14. A temperature of 27 degrees Celsius is equal to:

    • 300 K
    • 246 K
    • 27 K
    • 273 K

  15. In a Boyle's law experiment, plotting pressure against which quantity gives a line through the origin?

    • Temperature
    • 1 / temperature
    • 1 / volume
    • Volume

  16. The pressure of a fixed mass of gas in a sealed container is doubled at constant volume. Its absolute temperature:

    • quadruples
    • is unchanged
    • doubles
    • halves

  17. A gas at 2.0 x 10^5 Pa occupies 0.010 m^3 at constant temperature. It is compressed to 0.0050 m^3. What is the new pressure?

    • 1.0 x 10^5 Pa
    • 2.0 x 10^5 Pa
    • 8.0 x 10^5 Pa
    • 4.0 x 10^5 Pa

  18. 3.0 mol of ideal gas at 400 K occupies 0.040 m^3. What is its pressure?

    • about 2.5 x 10^4 Pa
    • about 2.5 x 10^5 Pa
    • about 1.0 x 10^5 Pa
    • about 5.0 x 10^5 Pa

  19. Why do real gases deviate from ideal behaviour at very high pressures?

    • Decreased kinetic energy
    • Inelastic collisions
    • Increased molecular speed
    • Intermolecular forces

  20. Which equation shows that equal gas volumes at equal temperature and pressure contain equal molecules?

    • pV = 1/3 Nmc^2
    • Q = mL
    • p1V1 = p2V2
    • pV = NkT

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