JAMB and WAEC Physics questions: Simple machines

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

1. Question 1· Simple machines· JAMB

   A wheel and axle has a wheel of radius 40 cm and an axle of radius 8 cm. Find its velocity ratio.

   • A32
   • B5
   • C0.2
   • D320

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   Explanation and discussion

2. Question 2· Simple machines· WAEC

   A pulley system of velocity ratio 3 lifts a load of 300 N with an effort of 125 N. Find its efficiency.

   • A2.4%
   • B80%
   • C120%
   • D60%

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3. Question 3· Simple machines· WAEC

   The efficiency of a machine is always less than 100% because

   • Athe effort is small
   • Bthe load is heavy
   • Csome energy is lost to friction
   • Dthe velocity ratio is large

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4. Question 4· Simple machines· JAMB

   A windlass has a handle of radius 60 cm turning an axle of radius 12 cm. Its velocity ratio is

   • A48
   • B5
   • C72
   • D0.2

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5. Question 5· Simple machines· WAEC

   An inclined plane is 5 m long and 1 m high. Its velocity ratio is

   • A5
   • B1
   • C0.2
   • D6

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6. Question 6· Simple machines· JAMB

   A pulley system with velocity ratio 4 lifts a load of 200 N with an effort of 80 N. Find its efficiency.

   • A160%
   • B40%
   • C80%
   • D62.5%

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7. Question 7· Simple machines· WAEC

   A machine has a mechanical advantage of 4 and a velocity ratio of 5. Find its efficiency.

   • A125%
   • B80%
   • C20%
   • D9%

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8. Question 8· Simple machines· WAEC

   A screw jack has a pitch of 0.5 cm and its handle turns in a circle of radius 35 cm. Find the velocity ratio. [π = 22/7]

   • A70
   • B220
   • C440
   • D880

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9. Question 9· Simple machines· WAEC

   A pulley system lifts a 600 N load with an effort of 200 N. The mechanical advantage is

   • A800
   • B0.33
   • C3
   • D400

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10. Question 10· Simple machines· JAMB

    A block and tackle with four pulleys has a velocity ratio of

    • A4
    • B2
    • C8
    • D1

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11. Question 11· Simple machines· WAEC

    In a pulley system the load is supported by 4 strands of rope. What is the velocity ratio?

    • A4
    • B2
    • C8
    • D1/4

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12. Question 12· Simple machines· WAEC

    A pulley system lifts a load of 600 N with an effort of 200 N. Its mechanical advantage is

    • A4
    • B3
    • C0.33
    • D12

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13. Question 13· Simple machines· JAMB

    A machine lifts a load of 600 N with an effort of 200 N. Find its mechanical advantage.

    • A0.33
    • B400
    • C3
    • D800

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14. Question 14· Simple machines· JAMB

    A screw jack has a pitch of 0.5 cm and a handle of length 35 cm. Find its velocity ratio. (Take π = 22/7.)

    • A70
    • B220
    • C440
    • D110

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15. Question 15· Simple machines· WAEC

    A machine of velocity ratio 5 lifts a load of 400 N with an effort of 100 N. Find its efficiency.

    • A80%
    • B125%
    • C25%
    • D20%

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16. Question 16· Simple machines· JAMB

    A wheelbarrow is a lever of the

    • Asecond class, with the load between the effort and the fulcrum
    • Bfirst class, with the fulcrum in the middle
    • Cthird class, with the effort in the middle
    • Dfourth class

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17. Question 17· Simple machines· JAMB

    A third-class lever is one in which

    • Athe fulcrum is between the effort and the load
    • Bthe effort is between the fulcrum and the load
    • Cthe load is between the fulcrum and the effort
    • Dthere is no fulcrum

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18. Question 18· Simple machines· JAMB

    An inclined plane is 5 m long and raises a load through a height of 1 m. Find its velocity ratio.

    • A0.2
    • B5
    • C4
    • D6

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19. Question 19· Simple machines· JAMB

    An inclined plane 5 m long raises a load through a height of 1 m. Its velocity ratio is

    • A0.2
    • B5
    • C6
    • D4

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20. Question 20· Simple machines· JAMB

    The efficiency of a real machine is always less than 100% because

    • Athe load is too heavy
    • Bsome work is wasted in overcoming friction
    • Cthe effort is too small
    • Dmachines create energy

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