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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 16:
In an ideal wheel an axle system, R stand for the radius of the wheel and r is the radius of the axle. the mechanical advantage is
  • A (R/r)<sup style='font-size: smaller;'>2</sup>
  • B R/R
  • C (r/R)<sup style='font-size: smaller;'>2</sup>
  • D R/r
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Question 17:
I. Work done by load is always less than the work done by effort.
II. All machines are made of levers, pulleys, screws and gear wheels.
III. A fishing rod is a machine.
Iv. Effort is always larger than load.
which of statements above about machines are true?
  • A II and III
  • B III and IV
  • C I and III
  • D II and iv
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Question 18:
A machine has a velocity ratio of 4. if it requires 800 N to overcome a load of 1600 N,what is the efficiency of the machine?
  • A 60%
  • B 50%
  • C 40%
  • D 2%
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Question 19:
A particle of weight 120N is placed on a plane inclined at 300 to the horizontal. If the plane has an efficiency of 60% to the floor what is the force required to push the weight uniformly up the plane?
  • A 50N
  • B 100N
  • C 175N
  • D 210N
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Question 20:
The efficiency of the pulley system shown above is 80%. find the effort E required to lift the load of 1200N
  • A 275N
  • B 325N
  • C 375N
  • D 573N
View Answer & Explanation