JAMB Physics 2020 Objective — Question 12

Question 12 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2020 Objective paper, with the correct answer and a full explanation.

12. A wheel and axle is used to raise a load of 500N by the use of an effort of 250N. Determine the efficiency of the machine if the radii of the wheel and axle are respectively 0.4cm and 0.1cm

A. A. 60%
B. B. 50%Correct
C. C. 40%
D. D. 20%

Explanation

Velocity ratio = radius of wheel/radius of axle = 0.4/0.1 = 4. Mechanical advantage = load/effort = 500/250 = 2. Efficiency = (MA/VR) x 100% = (2/4)x100% = 50%.

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