Lesson 4.7.2.4

4.7.2.4 Loudspeakers (physics only) (HT only) Quiz: AQA Physics, Unit 7

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.7.2.4, Loudspeakers (physics only) (HT only): 20 multiple choice questions for the AQA GCSE Physics (8463), Unit 7: Magnetism and electromagnetism, written with Revision Ninja.

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The 20 questions

  1. (Higher tier) Loudspeakers and headphones use which effect?

    • Induced magnetism
    • The motor effect
    • The generator effect
    • The photoelectric effect

  2. What does a loudspeaker convert electrical signals into?

    • Direct electrical current
    • Sound pressure variations
    • Rotational kinetic energy
    • Magnetic flux density

  3. In a moving-coil loudspeaker, what is the moving coil attached to?

    • A rotating armature
    • A steel core
    • A paper cone
    • A permanent magnet

  4. How does a loudspeaker coil respond to an alternating current input?

    • Expands in size
    • Oscillates back and forth
    • Remains completely stationary
    • Rotates continuously

  5. What physics principle is utilised by standard headphones?

    • The generator effect
    • Electromagnetic induction
    • Total internal reflection
    • The motor effect

  6. What causes the coil in a connected loudspeaker to move?

    • Thermal expansion
    • Magnetic force on current
    • Electrostatic attraction
    • Gravitational pull

  7. What change increases the volume produced by a moving-coil loudspeaker?

    • Increasing current amplitude
    • Increasing frequency only
    • Shortening the wire
    • Decreasing magnetic flux

  8. For a loudspeaker to produce a high-pitched sound, what must the current do?

    • Decrease to zero
    • Flow backwards
    • Vary rapidly
    • Remain constant

  9. What do loudspeakers and headphones convert electrical variations into?

    • Magnetic field lines
    • Thermal energy waves
    • Radio frequency signals
    • Sound pressure variations

  10. What causes the sound pressure variations produced by a loudspeaker?

    • Rotating copper coil
    • Stationary magnet force
    • Heating the air
    • Oscillating cone motion

  11. What type of electrical current is required to operate a moving-coil loudspeaker?

    • Zero current
    • Direct current
    • Varying current
    • Steady current

  12. Which physical effect is used by both loudspeakers and headphones?

    • The motor effect
    • Electromagnetic induction
    • The thermoelectric effect
    • The generator effect

  13. Which component of a moving-coil loudspeaker is placed in the magnetic field?

    • The audio cable
    • The coil
    • The plastic casing
    • The paper cone

  14. Name the device that converts a changing current into sound using the motor effect.

    • Electrical alternator
    • Step-down transformer
    • Moving-coil loudspeaker
    • Direct current dynamo

  15. A loudspeaker coil moves up when current flows one way. What happens when the current reverses?

    • The coil rotates fully
    • The coil melts instantly
    • The coil stops moving
    • The coil moves down

  16. What regions are created in the air by a loudspeaker's moving cone?

    • Peaks and troughs
    • Nodes and antinodes
    • Compressions and rarefactions
    • Tensions and stresses

  17. Which electromagnetic process is NOT used in the operation of a loudspeaker?

    • The generator effect
    • Magnetic forces
    • The motor effect
    • Current variations

  18. What is the primary purpose of the permanent magnet in a moving-coil loudspeaker?

    • To rectify the current
    • To amplify the sound
    • To insulate the wires
    • To provide a magnetic field

  19. (Higher tier) A loudspeaker coil carries 0.5 A, sits in a 0.2 T field and has 0.3 m of wire at right angles to the field. What is the force?

    • 0.03 N
    • 0.3 N
    • 0.003 N
    • 0.8 N

  20. What regions of high and low pressure do sound waves create in the air?

    • Nodes and antinodes
    • Troughs and crests
    • Reflections and refractions
    • Compressions and rarefactions

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