Lesson 3.04c

3.04c Moments in simple static contexts Quiz: OCR Maths, Unit 19

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.04c, Moments in simple static contexts: 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 standard SI unit used to measure the moment of a force?

    • N m
    • J s
    • N
    • N/m

  2. For a rigid body to be in complete static equilibrium, what must the resultant moment equal?

    • Zero
    • The mass
    • Infinity
    • One

  3. Where does the weight of a uniform rod act on the rod?

    • At the pivot
    • At one-quarter length
    • At its midpoint
    • At either end

  4. Where does the weight of a uniform rectangular lamina act?

    • Along one edge
    • At the base
    • Point of symmetry
    • At the corners

  5. A uniform rod has a length of 6 metres. At what distance from either end does its weight act?

    • 1.5 m
    • 2 m
    • 6 m
    • 3 m

  6. How is the moment of a force about a pivot correctly calculated?

    • Distance squared times force
    • Force times perpendicular distance
    • Force divided by distance
    • Force times parallel distance

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

    • 7 N m
    • 3.33 N m
    • 30 N m
    • 13 N m

  8. A rod pivots at its midpoint. What downward force at one end balances 20 N at the other?

    • 20 N
    • 0 N
    • 10 N
    • 40 N

  9. A uniform beam weighing 50 N rests horizontally on two end supports. What support force acts at each end?

    • 25 N
    • 100 N
    • 0 N
    • 50 N

  10. What moment is produced by a 15 N force acting at a perpendicular distance of 0.4 m?

    • 60 N m
    • 15.4 N m
    • 37.5 N m
    • 6 N m

  11. A beam is on the point of tilting about one support. What is the reaction at the other support?

    • Equal to weight
    • Undefined
    • Zero
    • Maximum

  12. A uniform 80 N rod rests horizontally on two end supports. What is the reaction at each support?

    • 80 N
    • 40 N
    • 20 N
    • 160 N

  13. A force of 8 N acts at a perpendicular distance of 3 metres from a pivot. What is the moment?

    • 24 N m
    • 2.67 N m
    • 11 N m
    • 5 N m

  14. A light 3 m beam supported at ends A and B carries 60 N at 1 m from A. Find reaction B.

    • 30 N
    • 20 N
    • 60 N
    • 40 N

  15. Apart from the resultant moment being zero, what other condition is required for static equilibrium?

    • Velocity increasing
    • Constant acceleration
    • Resultant force maximum
    • Resultant force zero

  16. For a non-uniform rod, how is the line of action of its weight usually determined?

    • Halving length
    • Assuming midpoint
    • Measuring length
    • Taking moments

  17. A light 4 m rod resting on end supports carries 12 N at 1 m from A. What is reaction B?

    • 6 N
    • 9 N
    • 3 N
    • 12 N

  18. A ladder rests against a smooth vertical wall. What is the direction of the reaction force at the wall?

    • Directly downwards
    • Perpendicular to wall
    • Parallel to wall
    • Along the ladder

  19. A force produces a moment of 24 N m at a perpendicular distance of 3 m. What is the force?

    • 8 N m
    • 72 N
    • 8 N
    • 27 N

  20. A uniform 80 N, 4 m rod pivots 1 m from end A. What downward force at A maintains balance?

    • 80 N
    • 40 N
    • 160 N
    • 20 N

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