Post-UTME Physics 2010 Objective — Question 1
Question 1 of 12 from the Post-UTME Screening (Post-UTME) Physics 2010 Objective paper, with the correct answer and a full explanation.
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A machine with a velocity ratio of 6 requires 800J of work to raise a load of 640N through a vertical distance of 1m. Find the efficiency of the machine.
- A. 20%
- B. 64%
- C. 80%Correct
- D. 75%
Explanation
Work output = 640 x 1 = 640J. Efficiency = output/input x100 = 640/800 x100 = 80%.
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