Lesson 4.1.1

4.1.1 Charge Quiz: OCR Physics, Unit 3

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.1.1, Charge: 20 multiple choice questions for the OCR Physics (H156), Unit 3: Electrons, waves and photons, written with Revision Ninja.

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The 20 questions

  1. Electric current is defined as the rate of flow of which quantity?

    • Electrical resistance
    • Electric charge
    • Power output
    • Potential difference

  2. The coulomb, the S.I. unit of charge, is equal to:

    • 1 A/s
    • 1 A s
    • 1 J/C
    • 1 V s

  3. The elementary charge e is approximately:

    • 1.6 x 10^-21 C
    • 1.6 x 10^-17 C
    • 1.6 x 10^-19 C
    • 9.1 x 10^-31 C

  4. What is the relative charge on a proton in terms of elementary charge e?

    • +2e
    • 0
    • +e
    • -e

  5. The net electric charge on any particle or object must always be a multiple of what?

    • Electron mass
    • Elementary charge e
    • Planck constant
    • Avogadro constant

  6. What charge carriers are responsible for electrical conduction inside metals?

    • Positive ions
    • Protons
    • Delocalised electrons
    • Negative ions

  7. Kirchhoff's first law is a direct consequence of the conservation of which physical quantity?

    • Energy
    • Potential
    • Momentum
    • Charge

  8. A current of 0.5 A flows for 2 minutes. What charge passes a point?

    • 120 C
    • 1 C
    • 60 C
    • 30 C

  9. How many electrons correspond to a charge of 1 C, given e = 1.6 x 10^-19 C?

    • 6.25 x 10^-19
    • 1.6 x 10^19
    • 6.25 x 10^18
    • 1.6 x 10^-19

  10. A current of 120 A carries a charge of 0.36 C past a point. How long does this take?

    • 0.3 s
    • 30 ms
    • 3 ms
    • 3 s

  11. A current of 0.1 A flows in a wire. How many electrons pass a point each second?

    • 6.25 x 10^17
    • 1.6 x 10^18
    • 6.25 x 10^18
    • 1.6 x 10^17

  12. An object has 5 more electrons than protons. What is its net charge?

    • -8.0 x 10^-19 C
    • +3.2 x 10^-19 C
    • -3.2 x 10^-18 C
    • +8.0 x 10^-19 C

  13. At a junction, currents of 3 A enter, and 1.2 A and 0.8 A leave along two branches. What current leaves along the third branch?

    • 0.4 A
    • 3.0 A
    • 2.0 A
    • 1.0 A

  14. A current of 2.4 A flows for 90 s. What charge passes a point?

    • 2160 C
    • 26.7 C
    • 0.027 C
    • 216 C

  15. An object has a net charge of +4.8 x 10^-18 C. How many electrons has it lost?

    • 0.03
    • 30
    • 300
    • 3

  16. In an electrolyte, positive ions move right at a rate giving 2 A of current, and negative ions move left giving 1 A. What is the net current?

    • 2 A to the right
    • 1 A to the left
    • 3 A to the right
    • 1 A to the right

  17. How does the direction of conventional current compare to electron flow in a circuit?

    • Opposite direction
    • Same direction
    • Random direction
    • Perpendicular direction

  18. A wire carries 0.5 A for 2 minutes. How many electrons pass a cross-section of the wire?

    • 3.75 x 10^20
    • 3.0 x 10^19
    • 1.2 x 10^20
    • 6.25 x 10^18

  19. A current of 5 A flows for 2 hours. How many electrons pass a point?

    • 5.6 x 10^22
    • 3.6 x 10^4
    • 1.8 x 10^23
    • 2.25 x 10^23

  20. What term describes a physical quantity that only occurs in discrete multiples of a constant?

    • Vectorial
    • Polarised
    • Quantised
    • Continuous

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