Lesson 3.7.4.1

3.7.4.1 Capacitance Quiz: AQA Physics, Unit 7

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.7.4.1, Capacitance: 20 multiple choice questions for the AQA Physics (7408), Unit 7: Fields and their consequences (A-level only), written with Revision Ninja.

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The 20 questions

  1. Which equation defines capacitance C in terms of charge Q and potential difference V?

    • C = Q x V
    • C = V / Q
    • C = Q / V
    • C = Q / V^2

  2. What is the SI unit used to measure electric capacitance?

    • Farad
    • Ohm
    • Volt
    • Coulomb

  3. A 4.7 mF capacitor is charged to 12 V. What charge is stored on it?

    • 0.056 C
    • 0.0039 C
    • 0.39 C
    • 2.6 C

  4. How does capacitance change if the potential difference across a capacitor is doubled?

    • It doubles
    • It quadruples
    • It halves
    • Remains unchanged

  5. A capacitor stores 2.0 mC of charge when the pd across it is 400 V. What is its capacitance?

    • 8.0 millifarad
    • 5.0 microfarad
    • 0.20 microfarad
    • 50 microfarad

  6. What quantity is represented by the gradient of a charge against potential difference graph?

    • Electric field strength
    • Stored energy
    • Capacitance
    • Relative permittivity

  7. A 220 microfarad capacitor is connected to a 9.0 V supply. Roughly what charge is delivered to it?

    • about 0.024 mC
    • about 0.20 mC
    • about 24 mC
    • about 2.0 mC

  8. What is the net charge on a fully charged parallel-plate capacitor?

    • Zero
    • 2Q
    • 0.5Q
    • Q

  9. A capacitor of capacitance 10 microfarad is charged. How much charge is needed to raise its pd from 0 V to 5.0 V?

    • 2.0 x 10^-4 C
    • 2.0 x 10^-6 C
    • 5.0 x 10^-6 C
    • 5.0 x 10^-5 C

  10. A capacitor holds 3.0 microcoulomb of charge at a pd of 6.0 V. What is its capacitance?

    • 0.5 millifarad
    • 0.5 microfarad
    • 18 microfarad
    • 2.0 microfarad

  11. Which change increases the capacitance of a parallel-plate capacitor?

    • Decreasing plate separation
    • Decreasing plate area
    • Increasing plate separation
    • Removing dielectric

  12. A 1.0 F capacitor is charged to 1.0 V. How much charge does it store?

    • 1.0 C
    • 0.5 C
    • 1.0 mC
    • 10 C

  13. What physical quantity is equal to stored charge divided by capacitance?

    • Stored energy
    • Relative permittivity
    • Electric current
    • Potential difference

  14. A 47 microfarad capacitor carries 0.94 mC. Its charge is then raised to 1.88 mC. What is the new pd?

    • 10 V
    • 80 V
    • 40 V
    • 20 V

  15. A connected capacitor has its plate separation doubled at constant voltage. What happens to charge?

    • It remains unchanged
    • It halves
    • It quadruples
    • It doubles

  16. Two capacitors store equal charge. Which capacitor has the higher potential difference across it?

    • The smaller capacitance
    • Both are equal
    • The larger capacitance
    • Neither capacitor

  17. The pd across a 2.5 microfarad capacitor is raised from 3.0 V to 9.0 V. How much extra charge is stored?

    • 15 microcoulomb
    • 3.3 microcoulomb
    • 30 microcoulomb
    • 1.5 microcoulomb

  18. An isolated charged capacitor has its potential difference doubled by moving plates apart. What is its new capacitance?

    • C
    • C / 2
    • 2C
    • 4C

  19. The charge on a capacitor is increased by 50% while its capacitance stays constant. By what factor does its pd change?

    • 2.25 times
    • 2.0 times
    • 1.5 times
    • 0.67 times

  20. A 33 microfarad capacitor holds 6.6 mC of charge. What is the pd across it?

    • 20 V
    • 2000 V
    • 0.005 V
    • 200 V

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