Lesson 3.04a

3.04a Moment of a force Quiz: OCR Maths, Unit 19

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.04a, Moment of a force: 20 multiple choice questions for the OCR Maths (H240), Unit 19: Moments, written with Revision Ninja.

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The 20 questions

  1. What is the SI unit for the moment of a force about a point?

    • N
    • N per m
    • N m
    • kg m

  2. Which formula calculates the magnitude of the moment of a force about a point?

    • Force times distance
    • Force times mass
    • Force over distance
    • Mass times distance

  3. At which point does the weight of a uniform rod always act?

    • Midpoint
    • Pivot point
    • Quarter point
    • End point

  4. What is the moment of a force whose line of action passes through the pivot?

    • Force times length
    • Infinite
    • Weight of body
    • Zero

  5. What is the value of the resultant moment for a body in static equilibrium?

    • Maximum
    • Equal to weight
    • Zero
    • Depends on pivot

  6. Which two primary conditions must be satisfied for a rigid body to remain in static equilibrium?

    • Max force, zero moment
    • Zero force, zero moment
    • Zero force, max moment
    • Max force, max moment

  7. At which point does the weight of a uniform rectangular lamina act?

    • Midpoint of base
    • Top corner
    • Intersection of diagonals
    • Along one edge

  8. What assumption is made about the weight of a rod described as light?

    • Smooth surface
    • Uniform density
    • Length is zero
    • Mass is negligible

  9. What is the moment of a 10 N force acting 3 m perpendicularly from a pivot?

    • 30 N m
    • 300 N m
    • 3.33 N m
    • 13 N m

  10. A force produces a moment of 20 N m at a perpendicular distance of 4 m. Find the force.

    • 5 N
    • 16 N
    • 80 N
    • 0.2 N

  11. Two equal and opposite moments act on a body about the same point. What is the net moment?

    • 0 N m
    • Half the moment
    • Double the moment
    • 10 N m

  12. A uniform rod of length 4 m has weight 50 N. What is its moment about one end?

    • 25 N m
    • 200 N m
    • 100 N m
    • 50 N m

  13. In what direction does the reaction force from a smooth vertical wall act on a ladder?

    • Vertically upwards
    • Along the ladder
    • Perpendicular to wall
    • Parallel to wall

  14. A uniform rod of mass 6 kg rests horizontally. What weight acts at its centre of mass?

    • 117.6 N
    • 29.4 N
    • 6 N
    • 58.8 N

  15. When a horizontal beam supported at two points is about to tilt, what happens to one support reaction?

    • It turns negative
    • It becomes zero
    • It doubles
    • It equals weight

  16. A force is applied directly at the pivot point of a lever. What is its moment?

    • Infinite
    • 0 N m
    • 5 N m
    • 10 N m

  17. A non-uniform rod has its centre of mass 2 m from end A. Where does weight act?

    • 4 m from A
    • At end B
    • At midpoint
    • 2 m from A

  18. A 2 m light rod is pivoted at A with a 12 N force at B. Find the moment.

    • 6 N m
    • 48 N m
    • 12 N m
    • 24 N m

  19. A beam rests on supports A and B. If it tilts about A, what is the reaction at B?

    • Equal to weight
    • Double the weight
    • 0 N
    • Half the weight

  20. A 10 N force acts 4 m from a pivot at right angles. What is the resulting moment?

    • 14 N m
    • 40 N m
    • 2.5 N m
    • 6 N m

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