JAMB Physics questions: Simple machines

13 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

   Show answer

   Explanation and discussion

2. Question 2· 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

   Show answer

   Explanation and discussion

3. Question 3· 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%

   Show answer

   Explanation and discussion

4. Question 4· Simple machines· JAMB

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

   • A4
   • B2
   • C8
   • D1

   Show answer

   Explanation and discussion

5. Question 5· 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

   Show answer

   Explanation and discussion

6. Question 6· 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

   Show answer

   Explanation and discussion

7. Question 7· 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

   Show answer

   Explanation and discussion

8. Question 8· 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

   Show answer

   Explanation and discussion

9. Question 9· 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

   Show answer

   Explanation and discussion

10. Question 10· 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

    Show answer

    Explanation and discussion

11. Question 11· 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

    Show answer

    Explanation and discussion

12. Question 12· Simple machines· JAMB

    A machine with velocity ratio 5 has an efficiency of 80%. Its mechanical advantage is:

    • A6.25
    • B5
    • C4
    • D0.16

    Show answer

    Explanation and discussion

13. Question 13· Simple machines· JAMB

    A lever has an effort arm of 60 cm and a load arm of 20 cm. Find its velocity ratio.

    • A40
    • B3
    • C1/3
    • D1200

    Show answer

    Explanation and discussion