JAMB and WAEC Physics questions

829 questions with answers and explanations. Tap an option to check yourself.

1. Question 281· Equilibrium of forces· JAMB

   The centre of gravity of a uniform triangular sheet is at the

   • Apoint where its medians meet
   • Bmidpoint of its base
   • Capex
   • Dcentre of its inscribed circle

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2. Question 282· Equilibrium of forces· JAMB

   When three coplanar forces keep a body in equilibrium, they can be represented by

   • Athe radius of a circle
   • Ba straight line
   • Ctwo parallel lines
   • Dthe three sides of a triangle taken in order

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3. Question 283· Equilibrium of forces· WAEC

   A see-saw pivoted at its centre has a 400 N child 1.5 m from the pivot. How far on the other side must a 300 N child sit to balance?

   • A1.5 m
   • B2.0 m
   • C1.125 m
   • D2.5 m

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4. Question 284· Equilibrium of forces· JAMB

   A uniform metre rule balances at the 50 cm mark. A 30 N weight hangs at the 20 cm mark. What weight at the 70 cm mark keeps the rule balanced?

   • A60 N
   • B30 N
   • C20 N
   • D45 N

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5. Question 285· Equilibrium of forces· JAMB

   

   A uniform metre rule is balanced horizontally on a pivot at its 50 cm mark by the two weights shown. Find W.

   • A6 N
   • B3 N
   • C12 N
   • D8 N

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6. Question 286· Equilibrium of forces· WAEC

   A racing car is made with a low centre of gravity and wide wheel base to

   • Aincrease speed
   • Bincrease stability
   • Creduce friction
   • Dincrease weight

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7. Question 287· Equilibrium of forces· JAMB

   A body acted on by parallel forces is in equilibrium when

   • Aonly the sum of the moments is zero
   • Bonly the sum of the forces is zero
   • Cthe sum of the forces and the sum of their moments are both zero
   • Dall the forces are equal

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8. Question 288· Equilibrium of forces· JAMB

   A body is in stable equilibrium if, when slightly displaced, its centre of gravity

   • Afalls
   • Brises
   • Cstays at the same level
   • Dmoves outside its base

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9. Question 289· Equilibrium of forces· WAEC

   A cone resting on its tip is in

   • Astable equilibrium
   • Bunstable equilibrium
   • Cneutral equilibrium
   • Dno equilibrium

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10. Question 290· Equilibrium of forces· JAMB

    A body is in unstable equilibrium if, when slightly displaced, its centre of gravity

    • Amoves upward and back
    • Brises
    • Cstays at the same level
    • Dfalls

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11. Question 291· Equilibrium of forces· JAMB

    A couple consists of

    • Atwo equal, opposite, parallel forces not in the same line
    • Btwo forces in the same direction
    • Ca single force
    • Dthree concurrent forces

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12. Question 292· Equilibrium of forces· JAMB

    A uniform beam balances at its centre. A 100 N weight hangs 1 m from the centre. How far from the centre, on the other side, must a 50 N weight hang to keep the beam balanced?

    • A4 m
    • B0.5 m
    • C1 m
    • D2 m

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13. Question 293· Friction· JAMB

    A box presses on the floor with a normal reaction of 50 N. If the coefficient of friction is 0.4, find the limiting friction.

    • A20 N
    • B125 N
    • C50.4 N
    • D12.5 N

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14. Question 294· Friction· JAMB

    Compared with the limiting (static) friction between two surfaces, the kinetic (sliding) friction is

    • Azero
    • Bgreater
    • Cequal
    • Dsmaller

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15. Question 295· Friction· JAMB

    A 20 kg box is pulled across a level floor at constant speed by a horizontal force of 60 N. Find the coefficient of kinetic friction. [g = 10 m/s²]

    • A0.6
    • B3.3
    • C0.3
    • D1.2

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16. Question 296· Friction· JAMB

    A 5 kg block is pulled along a floor by a horizontal force of 30 N against a friction force of 10 N. Find its acceleration.

    • A2 m/s²
    • B6 m/s²
    • C4 m/s²
    • D8 m/s²

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17. Question 297· Friction· WAEC

    Friction is useful in

    • Aproducing unwanted heat
    • Bwearing out machine parts
    • Cwalking and braking
    • Dreducing efficiency

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18. Question 298· Friction· WAEC

    Which of these increases friction between two surfaces?

    • Aoiling the surfaces
    • Broughening the surfaces
    • Cusing ball bearings
    • Dstreamlining

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19. Question 299· Friction· WAEC

    A horizontal force of 80 N keeps a 20 kg box moving steadily along a floor. Find the coefficient of friction. (g = 10 m/s²)

    • A0.4
    • B4
    • C0.25
    • D2.5

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20. Question 300· Friction· JAMB

    A block of weight 40 N on a horizontal surface just starts to move when a horizontal force of 12 N is applied. Find the coefficient of static friction.

    • A28
    • B3.3
    • C0.48
    • D0.3

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