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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 36:
The diagram shown represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40, then the value of W is?
  • A 28.0
  • B 48.0N
  • C 233.0N
  • D 50.0N
View Answer & Explanation
Question 37:
What effort will a machine of efficiency 90% apply to a load of 180N if its efforts arm is twice as long as its load arm?
  • A 100N
  • B 90N
  • C 80N
  • D 120N
View Answer & Explanation
Question 38:
A pulley system has three pulleys in the fixed block and two in the movable block and if the pulley has an efficiency of 72%, the mechanical advantage of the system is?
  • A 36.0
  • B 7.2
  • C 5.0
  • D 3.6
View Answer & Explanation
Question 39:
A 20kg mass is to be pulled up a slope inclined at 30° to the horizontal. If efficiency of the plane is 75%. The force required to pull the load up the plane is J [g=10ms\(^{− 2}\)]
  • A 87N
  • B 73.5N
  • C 133.3N
  • D 533.2N
View Answer & Explanation
Question 40:
The pitch of a screw jack is 0.45cm and the arm is 60cm long. If the efficiency of the Jack is 75/Ï€ %, calculate the mechanical advantage.
  • A 400
  • B 300
  • C 200
  • D 150
View Answer & Explanation