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Sunday, 16 August 2026
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Physics Past Questions and Answers

Topic: Simple Machines

Jamb Physics Questions - Simple Machines

Question 11:
In a wheel and axle mechanism the diameters of the wheel and axle are 40cm and 8cm respectively. Given that the machine is 80% efficient, what effort is required to lift a load of 100N?
  • A 20N
  • B 25N
  • C 50N
  • D 80N
View Answer & Explanation
Question 12:
The velocity ratio of a machine is 5 and its efficiency is 75%. What effort would be needed to lift a load of 150N with the machine?
  • A 20N
  • B 30N
  • C 40N
  • D 50N
View Answer & Explanation
Question 13:
The diagram above is a block and tackle pulley system in which an effort of 80N is use to lift a load of 240N. The efficiency of the machine is
  • A 60%
  • B 50%
  • C 40%
  • D 33%
View Answer & Explanation
Question 14:
A wheel and axle is used to raise a load of 500 N by the application of an effort of 250 N. If the radii of the wheel and the axle are 0.4 cm and 0.1 cm respectively, the efficiency of the machine is
  • A 20 %
  • B 40 %
  • C 50 %
  • D 60 %
View Answer & Explanation
Question 15:
A machine whose efficiency is 60% has a velocity ratio of 5. If a force of 500N is applied to lift a load P, what is the magnitude of P?
  • A 1500N
  • B 500N
  • C 4166N
  • D 750N
View Answer & Explanation