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Monday, 17 August 2026
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Physics Past Questions and Answers

Topic: Simple Machines

Jamb Physics Questions - Simple Machines

Question 26:
What effort will a machine of efficiency 90% apply to lift a load of 180N if its efforts arm is twice as long as its load arm?
  • A 80N
  • B 90N
  • C 100N
  • D 120N
View Answer & Explanation
Question 27:
A machine whose efficiency is 75% is used to lift a load of 1000N. Calculate the effort put in to the machine if it has a Velocity ratio of 4.
  • A 343.32N
  • B 233.33N
  • C 333.33N
  • D 334.33N
View Answer & Explanation
Question 28:
A wheel and an axle is used to raise a load whose weight is 800N when an effort of 250N is applied. If the radii of the wheel and axle are 800mm and 200mm respectively, the efficiency of the machine is
  • A 90%
  • B 80%
  • C 85%
  • D 87%
View Answer & Explanation
Question 29:
A stroboscope can be used to make the ware appear ..............
  • A Stationary
  • B In motion
  • C Dipper
  • D Ripple
View Answer & Explanation
Question 30:
What is the relationship mechanical advantage (MA) velocity Ratio (V.R) and efficiency with percentage?
  • A E = M.A/V.R à— 100 %
  • B M.A = E.V.R
  • C V.R = 1 à· sin θ M.A
  • D M.A = 1/E à— 100%
View Answer & Explanation