JAMB Physics 2010 Objective — Question 10

Question 10 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2010 Objective paper, with the correct answer and a full explanation.

10. A machine of velocity ratio 6 requires an effort of 400 N to raise a load of 800 N through 1 m. Find the efficiency of the machine. A. 50.0% B. 22.2% C. 33.3% D. 55.6%

A. 50.0%
B. 22.2%
C. 33.3%Correct
D. 55.6%

Explanation

M.A = L/E = 800/400 = 2. V.R = 6. Efficiency = M.A/V.R x 100% = 2/6 x 100% = 33.33%.

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