JAMB Physics 2008 Objective — Question 14

Question 14 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2008 Objective paper, with the correct answer and a full explanation.

14. The diagram shows a pulley system used to lift a load of 1200 N with efficiency 80%. Find the effort E required.

A. 275N
B. 325N
C. 375NCorrect
D. 573N

Explanation

M.A = %VR x 100 → 80% = M.A/4 x100, so M.A = 3.2. M.A = Load/Effort, so Effort = 1200/3.2 = 375N.

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