Post-UTME Chemistry 2013 Objective — Question 20

Question 20 of 22 from the Post-UTME Screening (Post-UTME) Chemistry 2013 Objective paper, with the correct answer and a full explanation.

A simple machine with an efficiency of 75% lifts a load of 5000N when a force of 500N is applied to it. Calculate the velocity ratio of the machine.

A. 10
B. 13.3Correct
C. 17.5
D. 25

Explanation

Efficiency = Mechanical Advantage/Velocity Ratio. MA = Load/Effort = 5000/500 = 10. VR = MA/efficiency = 10/0.75 = 13.3. (No printed answer key for this session; answer worked out independently.)

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