Lesson 4.2.1.4

4.2.1.4 Resistors Quiz: AQA Physics, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.2.1.4, Resistors: 20 multiple choice questions for the AQA GCSE Physics (8463), Unit 2: Electricity, written with Revision Ninja.

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The 20 questions

  1. Which component has a constant resistance as current changes at constant temperature?

    • Thermistor
    • Filament lamp
    • Ohmic conductor
    • Diode

  2. What happens to the resistance of a filament lamp as its temperature increases?

    • It drops to zero
    • It increases
    • It decreases
    • It stays constant

  3. Through how many directions does a standard semiconductor diode allow current to flow?

    • Zero directions
    • Two directions
    • All directions
    • One direction

  4. How does the resistance of a thermistor change when its temperature increases?

    • It fluctuates randomly
    • It decreases
    • It increases
    • It stays constant

  5. How does the resistance of an LDR change as light intensity increases?

    • It stays constant
    • It decreases
    • It increases
    • It becomes infinite

  6. Which circuit application commonly makes use of an LDR?

    • Fuse box
    • Electric toaster
    • Central heating thermostat
    • Automatic night light

  7. Which circuit application commonly makes use of a thermistor?

    • Thermostat
    • Light detector
    • Step-down transformer
    • Solar panel

  8. What shape is the I-V graph of a diode in forward bias?

    • Vertical straight line
    • Curve after threshold
    • Straight line through origin
    • Horizontal flat line

  9. What does a non-linear I-V graph indicate about a component?

    • Resistance remains constant
    • Voltage is always zero
    • Power is always zero
    • Resistance changes with current

  10. What happens to the resistance of a wire when its length is increased?

    • Decreases
    • Drops to zero
    • Increases
    • Stays constant

  11. Which two variables must be measured to calculate a component's resistance?

    • Energy and time
    • Current and power
    • Voltage and charge
    • Current and potential difference

  12. If a component's resistance stays constant as current changes, what is it called?

    • Non-ohmic conductor
    • Diode
    • Ohmic conductor
    • Thermistor

  13. What current flows through a diode connected in reverse bias?

    • Zero or negligible
    • Maximum current
    • Equal to supply current
    • Fluctuating current

  14. Why must a diode be correctly oriented in an electric circuit?

    • It amplifies signal
    • It blocks reverse current
    • It increases voltage
    • It lowers temperature

  15. What is true for an ohmic resistor at a constant temperature?

    • Current becomes zero
    • Resistance remains constant
    • Resistance increases
    • Resistance decreases

  16. What happens to the resistance of a thermistor when its temperature increases?

    • Stays constant
    • Increases
    • Fluctuates randomly
    • Decreases

  17. What environmental change increases the current through an LDR?

    • Decreasing temperature
    • Increasing light intensity
    • Increasing temperature
    • Decreasing light intensity

  18. Which variables are plotted to find the I-V characteristic of a component?

    • Power and resistance
    • Current and potential difference
    • Charge and time
    • Energy and voltage

  19. What does the I-V graph of an ohmic conductor look like?

    • S-shaped curve
    • Curve upwards
    • Straight line through origin
    • Horizontal line

  20. Which component has a resistance that remains constant as current changes at constant temperature?

    • Ohmic conductor
    • Diode
    • Filament lamp
    • Thermistor

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