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Resistance and light: LDRs: Edexcel International A Level Physics questions

Edexcel International A Level Physics past-paper questions on 2.4.5.2 Resistance and light: LDRs, 2019–2025, with mark schemes and examiner’s reports where available.

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  1. Q16(b)

    January 2025 · AS Unit 2

    6 marks2.4.5.2 Resistance and light: LDRs2.4.4.1 E.m.f., internal resistance and terminal p.d. (core practical 8)
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  2. Q16(a)

    June 2024 · AS Unit 2

    2 marks2.4.3.2 Potential dividers with thermistors and LDRs2.4.5.2 Resistance and light: LDRs
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  3. Q2

    January 2024 · AS Unit 2

    1 mark2.4.5.2 Resistance and light: LDRs
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  4. Q14

    June 2023 · AS Unit 2

    6 marks2.4.5.2 Resistance and light: LDRs2.4.1.4 Electrical power and energy
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  5. Q9

    June 2022 · AS Unit 2

    1 mark2.4.5.2 Resistance and light: LDRs
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  6. Q3(b)

    June 2022 · AS Unit 3

    3 marksP.1.1 Planning an experiment2.4.5.2 Resistance and light: LDRs
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  7. Q10

    January 2022 · AS Unit 2

    1 mark2.4.3.2 Potential dividers with thermistors and LDRs2.4.5.2 Resistance and light: LDRs
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  8. Q2(b)

    January 2022 · AS Unit 3

    4 marks2.4.5.2 Resistance and light: LDRs
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  9. Q15(c)(ii)

    June 2019 · AS Unit 2

    4 marks2.4.5.2 Resistance and light: LDRs2.4.3.2 Potential dividers with thermistors and LDRs
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All 9 questions on Resistance and light: LDRs, as a list
  1. January 2025, AS Unit 2, Q16(b) (6 marks): The voltmeter measures the terminal potential difference across the cell. Explain how increasing the intensity of light incident on the LDR affects the reading
  2. June 2024, AS Unit 2, Q16(a) (2 marks): The light intensity incident on the LDR decreases. Explain what happens to the potential difference across the fixed resistor. (2)
  3. January 2024, AS Unit 2, Q2 (1 mark): There is an increase in the intensity of light incident on a light dependent resistor (LDR). This causes a change in the number of conduction electrons and a ch
  4. June 2023, AS Unit 2, Q14 (6 marks): *14 The circuit shown contains a fixed resistor and a light dependent resistor (LDR). Explain why the power dissipated by the whole circuit changes as the inten
  5. June 2022, AS Unit 2, Q9 (1 mark): The number of conduction electrons in a light dependent resistor changes as light intensity increases. Which of the following best explains how the number of co
  6. June 2022, AS Unit 3, Q3(b) (3 marks): She varied I by varying the distance d between the LDR and a filament bulb. Describe a method the student could have used to obtain accurate values for R and d.
  7. January 2022, AS Unit 2, Q10 (1 mark): A light dependent resistor (LDR) and a fixed resistor are connected in a circuit, as shown. The intensity of the light incident on the LDR is increased. Which o
  8. January 2022, AS Unit 3, Q2(b) (4 marks): The student shone the light from the bulb onto a light dependent resistor (LDR). The student measured the resistance of the LDR using an ohmmeter. The student p
  9. June 2019, AS Unit 2, Q15(c)(ii) (4 marks): As the light intensity incident upon the LDR decreases, the power dissipated in the fixed resistor decreases. Explain why the power in the fixed resistor decrea

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