Lesson 2.1.2

2.1.2 S.I. units Quiz: OCR Physics, Unit 1

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 2.1.2, S.I. units: 20 multiple choice questions for the OCR Physics (H156), Unit 1: Foundations of physics, written with Revision Ninja.

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The 20 questions

  1. Which of these is NOT one of the S.I. base quantities listed in the specification?

    • Current
    • Force
    • Temperature
    • Amount of substance

  2. Which is the S.I. base unit for amount of substance?

    • The kelvin (K)
    • The mole (mol)
    • The kilogram (kg)
    • The ampere (A)

  3. The S.I. unit of electric current is the:

    • Coulomb (C)
    • Volt (V)
    • Ampere (A)
    • Watt (W)

  4. Which unit is the S.I. base unit used for temperature in physics calculations?

    • Joule (J)
    • Degree Celsius (C)
    • Newton (N)
    • Kelvin (K)

  5. Which expression gives the unit of momentum in S.I. base units?

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

  6. The prefix micro (μ) corresponds to which power of ten?

    • 10^-9
    • 10^3
    • 10^-3
    • 10^-6

  7. The prefix giga (G) denotes a multiplying factor of:

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

  8. The prefix centi (c) denotes a factor of:

    • 10^-2
    • 10^2
    • 10^-1
    • 10^-3

  9. Density is mass per unit volume. What is its S.I. unit in base units?

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

  10. Which expression for kinetic energy has the same base units as energy (kg m^2 s^-2)?

    • Ek = (1/2) m v^2
    • Ek = m v^3
    • Ek = m v
    • Ek = m v / t

  11. A quantity has unit kg m^2 s^-3. Which quantity is it?

    • Force
    • Power
    • Pressure
    • Energy

  12. Which value is 4.5 mW expressed in watts?

    • 4.5 x 10^-3 W
    • 4.5 x 10^3 W
    • 0.45 W
    • 4.5 x 10^-6 W

  13. A wire is 1.2 km long. Expressed in metres its length is:

    • 1200 m
    • 12 m
    • 12000 m
    • 120 m

  14. A table column is labelled 'time / ms'. The value 0.0025 s should be written in this column as:

    • 0.25 ms
    • 25 ms
    • 2.5 μs
    • 2.5 ms

  15. A current of 250 μA is equal to how many milliamperes?

    • 25 mA
    • 0.025 mA
    • 0.25 mA
    • 2.5 mA

  16. An equation for a quantity X is X = m v^2 / r. What is the S.I. unit of X?

    • The joule (kg m^2 s^-2)
    • kg m^2 s^-2
    • The newton (kg m s^-2)
    • kg m^-1 s^-1

  17. Which expression gives the S.I. unit of the spring constant k in F = kx?

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

  18. What must be true about S.I. base units on both sides of a homogeneous equation?

    • They equal zero
    • They are identical
    • They are inverted
    • They cancel out

  19. Which two physical quantities share the exact same S.I. base units?

    • Work and moment
    • Speed and acceleration
    • Force and pressure
    • Power and energy

  20. What is the S.I. base unit for luminous intensity?

    • candela
    • lux
    • watt
    • lumen

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