Lesson P1

P1 SI quantities and units Quiz: AQA Maths, Unit 12

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson P1, SI quantities and units: 20 multiple choice questions for the AQA Maths (7357), Unit 12: Mechanics, written with Revision Ninja.

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The 20 questions

  1. Which of these is a fundamental (base) quantity in SI mechanics?

    • Acceleration
    • Force
    • Mass
    • Velocity

  2. What is the SI unit of force?

    • Joule (kg m^2 s^-2)
    • Newton (kg m s^-2)
    • Watt (kg m^2 s^-3)
    • Pascal (kg m^-1 s^-2)

  3. What is the SI unit of acceleration?

    • N m^-1
    • m s^-2
    • m^2 s^-1
    • m s^-1

  4. What is the SI unit of moment of a force?

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

  5. What are the units of weight in SI?

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

  6. What is the dimension of force in terms of base quantities M, L and T?

    • MLT^-2
    • MLT^-1
    • ML^-1T^-2
    • ML^2T^-2

  7. What is the dimension of moment of a force?

    • ML^2T^-1
    • ML^2T^-2
    • ML^-1T^-2
    • MLT^-2

  8. Which of these is the SI base unit of mass?

    • Tonne
    • Gram
    • Kilogram
    • Newton

  9. Which quantity is a derived quantity rather than a base quantity?

    • Length
    • Mass
    • Time
    • Velocity

  10. Convert 5 km h^-1 into m s^-1 to 2 decimal places.

    • 5 m s^-1
    • 18 m s^-1
    • 0.01 m s^-1
    • 1.39 m s^-1

  11. Convert 250 g into kg.

    • 2.5 kg
    • 0.25 kg
    • 0.025 kg
    • 25 kg

  12. A mass of 2 kg has weight given by g = 9.8 m s^-2. What is its weight?

    • 19.6 N
    • 0.204 N
    • 9.8 N
    • 2 N

  13. In SI units, the acceleration due to gravity g is measured in:

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

  14. What is the unit of the coefficient of friction?

    • It is dimensionless
    • kg m^-1
    • Newtons
    • m s^-2

  15. A car of mass 1500 kg accelerates at 2 m s^-2. What is the resultant force on it?

    • 750 N
    • 3500 N
    • 3000 N
    • 1500 N

  16. Which equation is dimensionally consistent for displacement s, initial velocity u, acceleration a and time t?

    • s = ut + at
    • s = u + at
    • s = u t^2 + a t
    • s = ut + (1/2)at^2

  17. What is the dimension of kinetic energy (1/2)mv^2?

    • ML^2T^-2
    • MLT^-2
    • ML^2T^-1
    • ML^-1T^-2

  18. A body of mass 3 kg accelerates at 4 m s^-2. What is the resultant force?

    • 0.75 N
    • 12 N
    • 7 N
    • 1.33 N

  19. Convert 72 km h^-1 into m s^-1.

    • 20 m s^-1
    • 1.2 m s^-1
    • 7.2 m s^-1
    • 259.2 m s^-1

  20. A student states a speed as 25 m^2 s^-1. Why is this incorrect for a speed?

    • Speed should be given in kilograms
    • m^2 s^-1 is the SI unit of velocity
    • Speed is a scalar, so it needs no unit
    • Speed must have dimension LT^-1, but m^2 s^-1 has dimension L^2T^-1

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