Lesson 3.1.1

3.1.1 Use of SI units and their prefixes Quiz: AQA Physics, Unit 1

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.1.1, Use of SI units and their prefixes: 20 multiple choice questions for the AQA Physics (7408), Unit 1: Measurements and their errors, written with Revision Ninja.

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The 20 questions

  1. Which SI base unit is used to measure electric current?

    • ohm (ohm)
    • coulomb (C)
    • volt (V)
    • ampere (A)

  2. Which SI prefix means a multiplier of 10^-6?

    • micro (μ)
    • milli (m)
    • nano (n)
    • pico (p)

  3. Which is the SI base unit for amount of substance?

    • gram (g)
    • avogadro number (NA)
    • atomic mass unit (u)
    • mole (mol)

  4. What is one electronvolt expressed in joules?

    • 6.0 × 10^-19 J
    • 1.6 × 10^-19 C
    • 1.6 × 10^19 J
    • 1.6 × 10^-19 J

  5. How many joules are there in one kilowatt hour?

    • 3.6 × 10^6 J
    • 3.6 × 10^3 J
    • 3.6 × 10^9 J
    • 6.0 × 10^4 J

  6. How many hertz are there in one gigahertz?

    • 10^3 Hz
    • 10^12 Hz
    • 10^6 Hz
    • 10^9 Hz

  7. Which of these is an SI base unit of temperature?

    • celsius (°C)
    • fahrenheit (°F)
    • kelvin (K)
    • rankine (°R)

  8. Express 4.7 MHz in hertz.

    • 4.7 × 10^-6 Hz
    • 4.7 × 10^3 Hz
    • 4.7 × 10^9 Hz
    • 4.7 × 10^6 Hz

  9. Convert a capacitance of 3.2 pF into farads.

    • 3.2 × 10^-9 F
    • 3.2 × 10^12 F
    • 3.2 × 10^-12 F
    • 3.2 × 10^-15 F

  10. Convert an energy of 2.0 eV into joules, using 1 eV = 1.6 × 10^-19 J.

    • 3.2 × 10^-19 J
    • 3.2 × 10^-17 J
    • 2.0 × 10^-19 J
    • 1.25 × 10^19 J

  11. A heater of power 600 W operates for 5 minutes. What energy does it transfer?

    • 1.8 × 10^3 J
    • 1.8 × 10^5 J
    • 3.0 × 10^4 J
    • 3.0 × 10^5 J

  12. Convert a speed of 72 km/h into metres per second.

    • 72 m/s
    • 20 m/s
    • 7.2 m/s
    • 200 m/s

  13. A solid of mass 2.0 kg has volume 500 cm^3. What is its density in SI units?

    • 400 kg m^-3
    • 4 kg m^-3
    • 40000 kg m^-3
    • 4000 kg m^-3

  14. What is 1 square micrometre expressed in square metres?

    • 1 × 10^-9 m^2
    • 1 × 10^-18 m^2
    • 1 × 10^-6 m^2
    • 1 × 10^-12 m^2

  15. Which expression gives the joule in SI base units?

    • kg m^2 s^-1
    • kg m^2 s^-3
    • kg m s^-2
    • kg m^2 s^-2

  16. An electron gains an energy of 3.0 × 10^-18 J. Which is the closest energy in electronvolts?

    • about 19 eV
    • about 4.8 eV
    • about 0.05 eV
    • about 190 eV

  17. How many megajoules are there in 3.0 kW h?

    • 0.83 MJ
    • 1.08 MJ
    • 10.8 MJ
    • 3.0 MJ

  18. A length of 0.0045 Gm is expressed in millimetres. Which value is correct?

    • 4.5 × 10^12 mm
    • 4.5 × 10^6 mm
    • 4.5 × 10^9 mm
    • 4.5 × 10^3 mm

  19. Convert a particle energy of 4.8 × 10^-16 J into electronvolts (1 eV = 1.6 × 10^-19 J).

    • 3.0 × 10^3 eV
    • 3.0 × 10^-3 eV
    • 3.0 × 10^6 eV
    • 7.7 × 10^-35 eV

  20. Convert 25 microamperes into milliamperes.

    • 0.25 mA
    • 0.0025 mA
    • 0.025 mA
    • 25000 mA

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